Синтез N-ацилсульфонамідів: від загальновідомих реакцій ацилювання до сучасних каталітичних і сталих методів

N-Acyl sulfonamides are widely used bioisosteres of carboxylic acids, valued for their favorable physicochemical and pharmacokinetic properties as well as their frequent occurrence in drug-like molecules. This review summarizes the principal synthetic approaches to these motifs, covering both establ...

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Дата:2025
Автори: Gavrylenko, Oleksii V., Sosunovych, Bohdan S., Vashchenko, Bohdan V., Grygorenko, Oleksandr O., Moroz, Yurii S.
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Опубліковано: V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry of the National Academy of Sciences of Ukraine 2025
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Ukrainica Bioorganica Acta
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author Gavrylenko, Oleksii V.
Sosunovych, Bohdan S.
Vashchenko, Bohdan V.
Grygorenko, Oleksandr O.
Moroz, Yurii S.
author_facet Gavrylenko, Oleksii V.
Sosunovych, Bohdan S.
Vashchenko, Bohdan V.
Grygorenko, Oleksandr O.
Moroz, Yurii S.
author_institution_txt_mv [ { "author": "Oleksii V. Gavrylenko", "institution": "Enamine Ltd., Kyiv, Ukraine" }, { "author": "Bohdan S. Sosunovych", "institution": "Enamine Ltd., Kyiv, Ukraine" }, { "author": "Bohdan V. Vashchenko", "institution": "Taras Shevchenko National University of Kyiv, Kyiv, Ukraine; Enamine Scientific Research Institute (SRI), Kyiv, Ukraine" }, { "author": "Oleksandr O. Grygorenko", "institution": "Enamine Ltd., Kyiv, Ukraine; Taras Shevchenko National University of Kyiv, Kyiv, Ukraine; Enamine Scientific Research Institute (SRI), Kyiv, Ukraine" }, { "author": "Yurii S. Moroz", "institution": "Enamine Ltd., Kyiv, Ukraine; Enamine Scientific Research Institute (SRI), Kyiv, Ukraine; Chemspace LLC, Kyiv, Ukraine" } ]
author_sort Gavrylenko, Oleksii V.
baseUrl_str https://bioorganica.com.ua/index.php/journal/oai
collection OJS
datestamp_date 2026-06-29T15:59:56Z
description N-Acyl sulfonamides are widely used bioisosteres of carboxylic acids, valued for their favorable physicochemical and pharmacokinetic properties as well as their frequent occurrence in drug-like molecules. This review summarizes the principal synthetic approaches to these motifs, covering both established and emerging methodologies, with emphasis on catalytic, green, and operationally simple approaches. Common strategies include direct N-acylation of sulfonamides and N-sulfonylation of carboxamides, as well as transformations employing sulfonyl azides, sulfonyl isocyanates, and related multicomponent processes. Recent developments, such as recyclable heterogeneous catalysts, solvent-free and aqueous conditions, carbonylative and photocatalytic S-N couplings, and mild transition-metal-mediated reactions highlight simplicity and sustainability. Collectively these advances provide an adaptable and efficient synthetic toolbox for accessing diverse N-acyl sulfonamides relevant to modern organic and medicinal chemistry.
doi_str_mv 10.15407/bioorganica2025.02.013
first_indexed 2026-02-08T07:59:48Z
format Article
fulltext ISSN 1814-9758. Ukr. Bioorg. Acta, 2025, Vol. 20, N 2 UDC 547.551.525.211.1 DOI: https://doi.org/10.15407/bioorganica2025.02.013 13 REVIEW ARTICLE Synthesis of N-acyl sulfonamides: from common acylation reactions to modern catalytic and sustainable methods Oleksii V. Gavrylenko1, Bohdan S. Sosunovych1, Bohdan V. Vashchenko2,3*, Oleksandr O. Grygorenko1,2,3, Yurii S. Moroz1,2,4 1 Enamine Ltd. (www.enamine.net), Kyiv, Ukraine 2 Taras Shevchenko National University of Kyiv, Kyiv, Ukraine 3 Enamine Scientific Research Institute (ESRI), Kyiv, Ukraine 4 Chemspace LLC, Kyiv, Ukraine Abstract: N-Acyl sulfonamides are widely used bioisosteres of carboxylic acids, valued for their favorable physicochemical and pharmacokinetic properties as well as their frequent occurrence in drug-like molecules. This review summarizes the principal synthetic approaches to these motifs, covering both established and emerging methodologies, with emphasis on catalytic, green, and operationally simple approaches. Common strategies include direct N-acylation of sulfonamides and N-sulfonylation of carboxamides, as well as transformations employing sulfonyl azides, sulfonyl isocyanates, and related multicomponent processes. Recent developments, such as recyclable heterogeneous catalysts, solvent-free and aqueous conditions, carbonylative and photocatalytic S-N couplings, and mild transition-metal-mediated reactions highlight simplicity and sustainability. Collectively these advances provide an adaptable and efficient synthetic toolbox for accessing diverse N-acyl sulfonamides relevant to modern organic and medicinal chemistry. Keywords: N-acyl sulfonamides; green chemistry; catalysis; bioisosteres. Introduction N-Acyl sulfonamides are widely recognized in medicinal chemistry as valuable bioisosteres of carboxylic acids, and occupy a great range of acidic compounds in chemical libraries [1-3]. Their structural features allows for precise tuning of metabolic stability and binding affinity [1, 4] which in turn has driven the discovery and development of numerous medicinals, i.e., parecoxib [5-8] sulfacetamide [8- 10] acetyl sulfisoxazole [8, 11-13] etc. (see Figure 1). According to the literature data, the most common strategies for the synthesis of N-acyl sulfonamides can be summarized as shown in Figure 2, where the key sulfonyl fragment is used as a common precursor in reactions with various electrophilic or nucleophilic partners. Received: Revised: Accepted: Published online: 10.09.2025 23.09.2025 20.10.2025 31.12.2025  Corresponding author. Tel.: +380-93-924-5594; e-mail: vashchenko@knu.ua (B.V. Vashchenko) ORCID: 0000-0003-4575-2065 S Parecoxib N O N H O O O H2N S HN O O O Sulfacetamide H2N S N O O O Acetyl sulfisoxazole O N Figure 1. N-Acyl sulfonamide medicinals. In particular, various electrophilic or nucleophilic partners. In particular, the reported methods rely on the use of sulfonamides, sulfonyl azides, sulfonyl isocyanates, sodium sulfonate salts, triazole derivatives, or alternatively, include the sulfonylation of amides. The following sections discuss each of these strategies in detail. © Gavrylenko O.V. et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Ukrainica Bioorganica Acta www.bi oorgan ica . com.u a mailto:vashchenko@knu. https://orcid.org/0000-0003-4575-2065 ISSN 1814-9758. Ukr. Bioorg. Acta, 2025, Vol. 20, N 2 14 Figure 2. Main synthetic approaches to the synthesis of N-acyl sulfonamides. Acylation of sulfonamides A simple and efficient approach involves the direct acylation of sulfonamides using symmetrical anhydrides in the presence of a catalytic amount of H2SO4 (Scheme 1). The reaction is carried out in MeCN at 60 °C and demonstrates high efficiency, with the yields were up to 98%. Overall, neither steric nor electronic effects of the sulfonamide moiety significantly influenced the yield [14]. N H S R1 O O R2 O NH2 S R1 O O N H S t-Bu O O Me O N H S Me O O Ph O N H S Ph O O CF3 O (R2CO)2O N H S Ph O O t-Bu O 60% 44% 86% 94% N H S Me O O t-Bu O 94% N H S t-Bu O O t-Bu O 61% H2SO4 (cat.) MeCN, 60 °C 16 examples, up to 98% yields R1, R2 = Ar, Alk Scheme 1. Synthesis of acyl sulfonamides by acylation with symmetrical anhydrides (selected examples are given). Another simple and efficient approach involves the acylation of N-fluorophenyl sulfonamides with acyl chlorides in pyridine, which serves both as a solvent and as a base (Scheme 2). These compounds proved to be effective N-acylating agents, providing good chemoselectivity and high yields (up to 92%) when reacting with various aromatic and aliphatic substrates [15]. Another promising strategy for the synthesis of N-acyl sulfonamides involves the acylation reactions catalyzed by silica phosphoric acid (Schemes 3-4). This approach is applicable to both symmetrical carboxylic anhydrides and acyl chlorides; moreover, the reaction is characterized by operational simplicity and environmental friendliness due to the mild conditions and the use of solvent-free approach or heterogeneous systems at 80 °C. The method provides good to excellent yields (up to 98%), and the isolated products exhibit high purity after minimal work-up. Importantly, silico-phosphoric acid can be reused at least three times without a noticeable loss of catalytic activity [16]. N S R1 O O R3 O NH S R1 O O N S Me O O OBn O N S Me O O OBn O N S Tol O O OBn O R3COCl N S Me O O OBn O 70% 90% 74% 39% pyridine, rt >15 examples, up to 92% yields R1 = Ar, Alk; R2 = Ar; R3 = Cbz, Ph, t-BuR2 R2 F F CF3F N S Me O O Ph O 92% F N S Me O O t-Bu O 84% F Scheme 2. Synthesis of acylated sulfonamides from carboxylic acid chlorides (selected examples are given). N H S R1 O O R2 O NH2 S R1 O O N H S Tol O O Me O N H S Ph O O i-Pr O N H S Ph O O Me O N H S Tol O O Et O n-hexane, 85%; neat, 80% n-hexane, 97%; neat, 95% n-hexane, 87%; neat, 95% n-hexane 83%; neat, 80% n-hexane, reflux, or neat 80 °C 15 examples, up to 98% yields R1 = Ar, Alk; R2 = Alk N H S Me O O Et O n-hexane, 87%; neat, 82% N H S Me O O i-Pr O n-hexane, 98%; neat, 96% (R2CO)2O, silico- phosphoric acid (cat.) Scheme 3. Acylation of sulfonamides with carboxylic anhydrides in the presence of silico-phosphoric acid as a catalyst (selected examples are given). Lewis acids serve as other efficient catalysts for the acylation of sulfonamides with carboxylic anhydrides (Scheme 5). Studies have shown that BF3·Et2O, ZnCl2, MoCl5, TiCl4, B(C6F5)3, Sc(OTf)3, and even I2, can catalyze the reaction to form the desired products. Among the tested catalysts, ZnCl2 demonstrated the optimal balance in the activity, allowing for the efficient use of less reactive anhydrides, e.g., benzoic or pivalic anhydride. Furthermore, it was found that carboxylic acids themselves can also act as acylating agents in the presence of ZnCl2 (Scheme 6) [17]. The arsenal of methods also contains the direct and mild N-acylation of sulfonamides using esters as acylating agents (Scheme 7). Several Lewis acids were studied as promoters, among which TiCl4 proved to be the most effective, O.V. Gavrylenko et al. 15 affording high yields of the target N-acyl sulfonamides (up to 97%). As in the previous examples, the simplicity of both the reaction procedure and product isolation could be highlighted [18]. N H S Tol O O Ph O N H S Ph O O Me O N H S Ph O O Ph O N H S Tol O O Me O n-hexane, 90%; neat, 82% n-hexane, 82%; neat, 80% n-hexane, 82%; neat, 80% n-hexane, 87%; neat, 75% 15 examples, up to 90% yields R1 = Ar, Alk; R2 = Ar N H S Me O O Ph O n-hexane, 89%; neat, 80% N H S Me O O Me O n-hexane, 80%; neat, 85% N H S R1 O O R2 O NH2 S R1 O O n-hexane, reflux, or neat, 80 °C R2COCl, silico- phosphoric acid (cat.) Scheme 4. Acylation of sulfonamides with carboxylic acid chlorides in the presence of silico-phosphoric acid (selected examples are given). N S R2 R1 O O R3 O NH S R2 R1 O O N H S Ph O O Ph O N H S Ph O O CF3 O N H S Ph O O Me O (R3CO)2O N H S Tol O O Me O 97% 94% 88% 97% N H S Me O O Me O 98% N Bn S Me O O Me O 95% ZnCl2 (cat.) CH2Cl2, rt 17 examples, up to 98% yields R1 = Ar, Alk; R2 = H, Alk; R3= Me, Et, nPr, tBu, Ph Scheme 5. N-Acylation of sulfonamides with carboxylic anhydrides in the presence of ZnCl2 as a catalyst (selected examples are given). N H S R1 O O R2 O NH2 S R1 O O N H S Ph O O O N H S Tol O O O N H S Ph O O O R2CO2H N H S Ph O O O 80% 84% 82% 80% 85% N H S Me O O O 82% ZnCl2 (cat.) CH2Cl2, rt Ph Ph OMe OMe Ac N H S Ph O O O Scheme 6. N-Acylation of sulfonamides with carboxylic acids in the presence of ZnCl2 as a catalyst. The arsenal of methods also contains the direct and mild N-acylation of sulfonamides using esters as acylating agents (Scheme 7). Several Lewis acids were studied as promoters, among which TiCl4 proved to be the most effective, affording high yields of the target N-acyl sulfonamides (up to 97%). As in the previous examples, the simplicity of both the reaction procedure and product isolation could be highlighted [18]. N H S R1 O O R2 O NH2 S R1 O O N H S Tol O O 2Py O N H S Tol O O Tol O N H S Tol O O Ph O R2CO2R3 N H S Me O O Ph O 97% 55% 45% 63% TiCl4, (CHCl2)2, 115160 °C S CO2Et NH2 O O S NH O O O82% 18 examples, up to 97% yields, R1, R2 = Ar, Alk; R3 = Alk N H S Ph O O Me O 94% N H S Tol O O Me O 76% Scheme 7. N-Acylation of sulfonamides with carboxylic esters in the presence of TiCl4 (selected examples are given). An interesting approach to the synthesis of N-acyl sulfonamides employs cesium phosphotungstate Cs5HP2W18O62 as an efficient and recyclable catalyst (Scheme 8). This methodology is environmentally attractive since the reactions are conducted in water using only catalytic amounts of the reagent at rt. A variety of representative N-acyl sulfonamides were synthesized in high yields (up to 92%), whereas in refluxing water, cyclic imides containing a sulfonyl fragment were formed [19]. N S Tol O O R2 O NH S Tol O O N H S Tol O O O N H S Tol O O O N H S Tol O O Me O N S Tol O O 92% 90% 55% 77% 60% N S Tol O O Me O 80% Cs5HP2W18O62 (cat.), H2O, rt CO2H N S Tol O O (R2CO)2O R1 R1 33 examples. up to 92% yields R1, R2 = Ar, Alk CO2H O O O O Br Scheme 8. N-Acylation of sulfonamides with carboxylic anhydrides in the presence of Cs5HP2W18O62 as a catalyst (selected examples are given). Another example of heterogeneous catalysis is the application of iron-exchanged montmorillonite K10-FeO in the N-acylation of sulfonamides with carboxylic anhydrides ISSN 1814-9758. Ukr. Bioorg. Acta, 2025, Vol. 20, N 2 16 (Scheme 9), which was highly effective for a wide range of sterically and electronically diverse substrates, providing yields up to 98% and excellent chemoselectivity. As in the previous case, the ability to reuse K10-FeO multiple times without a significant loss of catalytic activity makes this approach both economically and environmentally feasible [20]. N H S R1 O O R2 O NH2 S R1 O O N H S Me O O Me O N H S Me O O Ph O N H S Ph O O Me O 92% 62% 82% K10-FeO (cat.), MeCN, 60 °C (R2CO)2O 14 examples, up to 98% yields R1, R2 = Ar, Alk N H S O O CF3 O N H S O O Me O N H S O O Me O 98% 91% 66% ClCl MeO Scheme 9. N-Acylation of sulfonamides with carboxylic anhydrides in the presence of K10-FeO (selected examples are given). A promising approach involves the use of metal hydrogensulfates as acidic catalysts (Scheme 10). It has been shown that Al(HSO4)3 and Zr(HSO4)4 exhibit the highest activity in reactions of sulfonamides with carboxylic anhydrides, efficiently catalyzing the process under both heterogeneous and solvent-free conditions [21]. N S R1 O O R3 O NH S R1 O O N H S Me O O Me O N H S Ph O O Me O Al(HSO4)3, neat,  90% Al(HSO4)3, CH2Cl2,  91% Zr(HSO4)4, neat,  93% Zr(HSO4)4, CH2Cl2,  90% Al(HSO4)3 or Zr(HSO4)4 (cat.), CH2Cl2 or neat, rt (R3CO)2O >30 examples, up to 96% yields R1, R2 = Ar, Alk Al(HSO4)3, neat,  88% Al(HSO4)3, CH2Cl2,  86% Zr(HSO4)4, neat,  96% Zr(HSO4)4, CH2Cl2,  85% N S Tol O O Et O N H S Tol O O Et O Al(HSO4)3, neat,  92% Al(HSO4)3, CH2Cl2,  88% Zr(HSO4)4, neat,  89% Zr(HSO4)4, CH2Cl2,  89% Al(HSO4)3, neat,  75% Al(HSO4)3, CH2Cl2,  75% Zr(HSO4)4, neat,  72% Zr(HSO4)4, CH2Cl2,  72% R2 R2 Ph Scheme 10. N-Acylation with carboxylic anhydrides in the presence of Al(HSO4)3 or Zr(HSO4)4 (selected examples are given). N-Acylation of sulfonamides with carboxylic acids using EDC (1-(3-dimethylaminopropyl)-3-ethylcarbodiimide) as a typical activating reagent was also reported [22]. A more advanced example involves the synthesis of an N-acyl sulfonamide library using EDC immobilized on a polymer support (Scheme 11). In this protocol, a sulfonic acid resin (A-15) is employed to bind N,N-dimethylaminopyridine (DMAP). The purification of the reaction mixture is simplified to a simple filtration, making the method convenient and suitable for large-scale applications. The literature reports 25 examples of target product synthesis using this method, with yields reaching up to 81% [23]. N H S R1 O O Ph O NH2 S R1 O O N H S Bn O O Ph O N H S Ph O O Ph O N H S Me O O Ph O 66% 56% 64% (CH2Cl)2, t-BuOH, DMAP, PhCO2H, 25 examples, up to 81% yields R1, R2 = Ar, Alk N H S O O Ph O N H S O O Ph O N H S O O Ph O 75% 63% 81% O2N N N Cl- C N SO3H (A-15) CO2Me Cl Scheme 11. N-Acylation of sulfonamides with carboxylic acids in the presence of EDC immobilized on polymer support (selected examples are given). A highly efficient and relatively mild approach relied on the use of cyanuric chloride as an activating reagent of carboxylic acid in the presence of triethylamine, and aluminum oxide in acetonitrile at rt, to afford the target products in yields of up to 92% (Scheme 12) [24]. N H S R1 O O R2 O NH2 S R1 O O N H S O O Tol O N H S Me O O Ph O N H S Ph O O Ph O 92% 74% 55% Et3N, Al2O3, MeCN, rt 16 examples, up to 92% yields R1, R2 = Ar, Alk R2CO2H, Cl ClCl N NN BzHN N H S O O Me O N H S Me O O Me O N H S Ph O O Tol O 85% 68% 60% BzHN Scheme 12. The straightforward synthesis using carboxylic acids and cyanuric chloride (selected examples are given). Another efficient approach involves the synthesis of N- acyl sulfonamides through sequential reactions of primary amines with arylsulfonyl chlorides followed by acylation of the intermediates with acyl chlorides (Scheme 13). In the first step, the reaction of anilines with arylsulfonyl chlorides under solvent-free conditions in the presence of O.V. Gavrylenko et al. 17 NaHCO3 leads to the formation of N-arylsulfonamides. These intermediates are then subjected in situ to further acylation with benzoyl chloride or its derivatives to afford the corresponding N-benzoyl-N-arylsulfonamides. Moreover, acylation of sulfonamides with acyl chlorides can also be performed as a separate step (Scheme 14) [25]. N S R1 O O R3 O S R1 O O N S Tol O O Ph O N S Tol O O Ph O N S Ph O O Ph O 92% 86% 86% 2. R3C6H4COCl, K2CO3, rt Cl R2 Ph oMeC6H4 oMeOC6H4 9 examples, up to 96% yields R1, R2 = Ar N S Tol O O Ph O N S Tol O O Ph O N S Tol O O Ph O 72% 95% 96% pMeOC6H4 mClC6H4 pClC6H4 1. R2NH2, NaHCO3, rt, neat Scheme 13. Sulfonylation and acylation as a one-pot method for the synthesis of N-acyl sulfonamides (selected examples are given). N S R1 O O R3 O S R1 O O N S Tol O O 4-NO2C6H4 O N S Ph O O 4-NO2C6H4 O N S Ph O O 4-NO2C6H4 O 70% 80% 91% K2CO3, rt, neat R3C6H4COCl, R2 NH R2 Ph Tol 1-naphtyl N S Tol O O 3,5-(NO2)2C6H4 O N S Ph O O 3,5-(NO2)2C6H4 O N S Ph O O 3,5-(NO2)2C6H4 O 84% 70% 95% pClC6H4 Bn oMeOC6H4 13 examples, up to 95% yields R1, R2, R3 = Ar Scheme 14. N-Acylation of sulfonamides with carboxylic acid chlorides in the presence of K2CO3 under solvent-free conditions (selected examples are given). An unusual approach to the synthesis of N-acyl sulfonamides involves the use of air-stable and crystalline N-acyl-DBN tetraphenylborate salts (1,5-diazabicyclo- [4.3.0]-non-5-ene, Scheme 15), obtained from DBN and the corresponding acyl chlorides in the presence of NaBPh4. These salts act as efficient N-acylating agents that selectively react with primary and secondary amines as well as sulfonamides to give the desired products in high yields of up to 98%. An advantage of this method is the ease of product isolation, as the by-product DBN·HBPh4 can be removed by simple filtration, providing pure N-acylated compounds without the need for additional purification steps. Notable, N-acyl-DBN tetraphenylborate salts can be stored in air without the risk of decomposition [26]. N S R1 O O Me O S R1 O O N S Tol O O Me O N H S Tol O O Me O 80% 65% DBN (cat.), MeCN, 80 °C N H S Ph O O Me O 83% N H S Me O O Me O 98% R2 NH R2 N N O Me BPh4 - N H S O O Me O 74% MeO Bn Scheme 15. Application of N-acyl-DBN tetraphenylborate salts for the synthesis of N-acyl sulfonamides. Another approach to the synthesis of N-acyl sulfonamides involves the use of N-acylbenzotriazoles (R2COBt) as acylating agents, which could be beneficial in the cases when the corresponding acyl chlorides or other common acylating agents are difficult to access or unstable (Scheme 16) [27]. N H S R1 O O R2 O NH2 S R1 O O N H S Tol O O 2-furyl O N H S Tol O O Tol O N H S Tol O O 4-Py O R2COBt N H S Tol O O 4-Py O 98% 95% 95% 97% NaH, THF, reflux Bt = benzotriazole 18 examples, up to 100% yield R1 = Ar, Alk; R2 = Ar; R3 = Cbz, Ph, tBu N H S Me O O Tol O 92% N H S Me O O 2-furyl O 98% Scheme 16. N-Acylation of sulfonamides using N-acyl- benzotriazoles (selected examples are given). The reaction of sulfonamides was carried out with a wide range of substrates in the presence of NaH in refluxing THF. Additionally, it has been shown that N-sulfonyl- benzotriazoles can participate in reactions with carboxamide substrates as sulfonylating agents, providing an alternative route to the target products (Scheme 17) [27]. The sulfonylation reactions will be discussed in more detail in the following section. N H S R1 O O R2 O Bt S R1 O O N H S Tol O O Tol O N H S Tol O O 4-Py O R2CONH2 91%83% NaH, THF, reflux Bt = benzotriazole N H S Me O O Tol O 34% N H S Me O O 4-Py O 77% Scheme 17. N-Sulfonylation of carboxamides using N-sulfonyl- benzotriazoles. ISSN 1814-9758. Ukr. Bioorg. Acta, 2025, Vol. 20, N 2 18 An interesting example is an one pot reaction that uses ZnO nanoparticles as heterogeneous catalyst (Scheme 18). The reaction proceeds via sequential sulfonylation and acylation of amines under solvent-free conditions, providing high yields of up to 95% [28]. N S R1 O O R3 O S R1 O O N H S Ph O O Me O N H S Me O O Ph O N H S Me O O Me O X = AcO - 93% X = Cl - 95% X = Cl - 92% X = AcO - 91% nano-ZnO (cat.), 2. R3COX Cl R2 15 examples, up to 95% yields R1, R2, R3 = Ar, Alk N S Tol O O Ph O N S Tol O O Me O N S Me O O Ph O X = Cl - 89% X = Cl - 93% X = Cl - 93% Ph Ph nBu 1. R2NH2, rt Scheme 18. Use of ZnO nanoparticles as a heterogeneous catalyst for the synthesis of N-acyl sulfonamides (selected examples are given). N-Sulfonylation of amides Another typical approach to the synthesis of N-acyl sulfonamides involves sulfonylation reactions of carboxamides. N S Tol O O R1 O N S Tol O O Me O N H S Tol O O Ph O N H S Tol O O Me O 86% 85% 85% EtOH/THF (2/1), ultrasonic, rt 18 examples (5 of them N-acyl sulfonamides), up to 92% yieds R1, R2 = Ar, Alk N S Tol O O Ph O 83% TolSO2Cl, Na O R1 NH R2 R2 N N S O O O O O Tol S O O Tol 88% Ph Ph Scheme 19. N-Sulfonylation using pTsCl in the presence of Na in EtOH–THF under ultrasonic conditions (selected examples are given). Another approach involves ultrasonic N-sulfonylation of amines, imides, amides, and anilides using p-toluene- sulfonyl chloride (pTsCl) in the presence of dispersed sodium in an EtOH-THF mixture (Scheme 19). This method combines robustness and high efficiency: the reactions proceed under mild conditions, and are completed within 2-8 minutes and afford high product yields of up to 92%. The protocol is also economically favorable due to the use of readily available reagents, and the potential for scale- up [29]. It is also worth noting that in cases where the amide proton is sufficiently acidic, DMAP could be successfully employed (Scheme 20) [30]. DMAP, MeCN, rt 74% TolSO2Cl NH O O N O O S O O Tol Scheme 20. N-Sulfonylation of amides in the presence of DMAP as a mild base. Synthesis from sulfonyl azides and isocyanates An efficient one-step methodology for the conversion of carboxylic acids into N-acyl sulfonamides via the reaction with sulfonyl azides was reported (Scheme 21) [31]. N H S R2 O O R1 O1. i-BuOCOCl, 2,6-lutidine, THF, 0 °C N H S O O O N H S O O O N H S O O O 86% 83% 98% N H S O O O N H S O O O 96% 94% R1 OH O 2. TMS-SLi, THF, 0 °C 3. R2SO2N3 HO2C HO2C HO2C TMS TMS OH NHBoc Me OBn Me NHBoc NHFmoc Me NHFmoc Me NHFmoc NHBoc R1 = Alk R2 = Ar, Alk Scheme 21. The conversion of carboxylic acids into N-acyl sulfonamides via the formation of thioacids. An intermediate step involves the formation of a thioacid, which directly reacts with the sulfonyl azide to afford the target products A further development of this method included the use of H2O/NMP (N-methyl-2-pyrrolidone) (1:3, v/v) in the pre- sence of NaHCO3 at rt. The reaction was performed with readily available thioacids and sulfonyl azides, allowing the preparation of 18 examples in high yields (up to quantitative) [32]. Other reports were devoted to the DNA-encoded libraries (DEL), which is a typical approach in the drug discovery programs. Considering the broad pharmacological relevance of the N-acyl sulfonamide fragment, strategies enabling its incorporation into DEL platforms have attracted particular attention (Schemes 23 and 24). The copper-catalyzed three-component reactions between alkynes and sulfonyl azides efficiently generated the diverse set of N-acyl sulfonamides in high yields (up to 96%) [33]. Another interesting transformation included the Pd(0)- catalyzed carbonylative coupling of sulfonyl azides with electron-rich heterocycles (Scheme 25). O.V. Gavrylenko et al. 19 N H S O O R2 O N3 S O O R2COSH H2O/NMP (1/3), NaHCO3, rt 18 examples, up to 100% yields R1, R2, R3 = Ar, Alk, H H N R1 H N R1 N H S O O Me O H2N N H S O O Ph O H2N N H S O O pCF3C6H4 O H2N 90% 74% 100% N H S O O Me O H N Ac N H S O O pNO2C6H4 O H N Ac N H S O O oMeOC6H4 O H N Ac 91% 84% 90% Scheme 22. The reaction of sulfonyl azides into N-acyl sulfonamides (selected examples are given). HN S R1 O O ON3 S R1 O O CuI, DIPEA, DMF borate buffer, rt 20 examples, up to 96% yield, R1 = Ar, Alk 83% 73% 83% 96% 65% 69% HN O DNA HN O DNA N N N N CF3 N N BrNO2 CF3 O O Scheme 23. Copper-catalyzed three-component reaction of sulfonyl azides and alkynes integrated into DNA-encoded libraries (selected examples are given). The key step involves the in situ formation of a sulfonyl isocyanate intermediate from the corresponding sulfonyl azide, followed by regioselective C-C bond formation of indole or pyrrole nucleophiles. This approach enabled the synthesis of more than 35 examples of indole- and pyrrole- substituted N-acyl sulfonamides in yields of up to 95%. The method does not require the use of specialized ligands, is compatible with an ex situ solid CO source and operates under mild conditions (40 °C). An additional advantage of this protocol is the possibility of isotopic labeling of N-acyl sulfonamides with carbon-11, making it particularly attractive for subsequent biological evaluation and in vivo studies using positron emission tomography (PET) [34]. The literature also reports the direct use of aryl sulfonyl isocyanates in reactions with carboxylic acids to afford N-acyl sulfonamides (Scheme 26). The reaction proceeds efficiently in THF at rt in the presence of Et3N and is accompanied by CO2 evolution. A few minutes after the gas release ceases, the corresponding N-acyl sulfonamides were formed in high yields [35]. NH S O O O CuI, DIPEA, DMF borate buffer, rt 15 examples, up to 73% yields, R1 = Ar 73% 57% 51% 41% S HN O DNA R1 N OMe CF3 R1 O N3 O O DNA 48% 58% 60% 53% tBu NO2 OMe OMe S Scheme 24. Variation of the copper-catalyzed three-component reaction between alkynes and sulfonyl azides integrated into DNA-encoded libraries (selected examples are given). N H S R1 O O O N3 S R1 O O Pd(OAc)2 (cat.), CO, N H S Tol O O O 68% Mo(CO)6, DBU, MeCN, N2, 40 °C N R3 N R3 R2 R2 >35 examples, up to 95% yields, R1, R2, R3 = Ar, Alk, H N Ph N H S Tol O O O 84% N Me N H S Bun O O O 70% N Me Ph N H S O O O 89% N Me S N H S Tol O O O 76% N N H S Tol O O O 84% N Me Ph Scheme 25. Palladium(0)-catalyzed synthesis of N-acyl sulfonamides (selected examples are given). ISSN 1814-9758. Ukr. Bioorg. Acta, 2025, Vol. 20, N 2 20 N H S R1 O O R2 O S R1 N H S Tol O O O 97% 10 examples, up to 100% yields R1, R2 = Ar, Alk N H S Tol O O O 96% N H S Tol O O O 85% N H S Tol O O O 100% 83% 90% NCO O O R2 O HO CO2Me Br Me Me O N H O S Me O O O N H O S Tol O O NEt3 THF, rt Scheme 26. Synthesis of N-acyl sulfonamides from sulfonyl isocyanates and carboxylic acids (selected examples are given). Miscellaneous synthetic methods The photocatalytic synthesis of N-acyl sulfonamides was also reported (Scheme 27). The reaction is based on S-N coupling between sodium sulfinates and hydroxamic acids or N-hydroxycarbamates in the presence of the photocatalyst 2,3,5,6-tetra(9H-carbazol-9-yl)benzonitrile (4CzBN). This method enables access to a broad range of target sulfonamides in high yields of up to 97%. Mechanistic investigations confirmed that the key step involves the generation of singlet oxygen (1O2) through an energy transfer process [36]. The reaction of N-sulfonyl-1,2,3-triazoles with thioesters in the presence of a rhodium(II) catalyst also provides access to N-acyl sulfur-containing sulfonamides in a stereoselective manner (Scheme 28). The mechanism of this transformation involves the formation of an α-imino rhodium carbene complex, followed by nucleophilic attack of the sulfur atom of thioester on the carbene carbon and intramolecular migration of the acyl group from sulfur to the imino nitrogen [37]. Notably, this approach was also successfully employed for the synthesis thiolactones. The related approach included the reaction of N-sulfonyl- 1,2,3-triazoles with thioesters in the presence of a rhodium catalyst. However, in this case, the use of acyl selenides instead of thioesters enables the formation of N-acyl selenium-containing sulfonamides as the target products (Scheme 29). The reaction proceeds upon heating and in the presence of the Rh2Piv4 complex, which catalyzes a rapid and stereoselective 1,3-difunctionalization. The high functional group tolerance of this method was confirmed in 35 examples, with yields reaching up to 95% [38]. Copper catalysis has opened a new direction in the reactivity of nitrones and enamides, enabling the diversion of classical thermal dipolar cycloadditions toward the formation of γ-keto- and γ-aldoamides (Scheme 30). The key step involves the generation of an iminium intermediate resulting from the nucleophilic attack of the activated enamide. This initiates a diastereoselective rearrangement accompanied by the formation of a new C-C bond, where the alkyne group of the N-alkynyl sulfonamide is transformed into an acyl group, leading to the target N-acyl sulfonamides in high yields of up to 98% [39]. N H S R1 O O R2 O S R1 N H S Tol O O 2-OHC6H4 O 33% >30 examples, up to 97% yield R1 = Ar, Alk; R2 = Ar, OR N H S Tol O O O 52% N H S O O 4-tBuC6H4 O 92% N H S Tol O O 4-FC6H4 O 84% - 97% ONa O 4CzBN (cat.), Na2S2O4, BTAC R2 O N H 4-tBuC6H4N H O S Et O O N H O S Tol O O iPrOAc/H2O/AcOH, blue light, rt HO N N N N N 4CzBN S Scheme 27. Photocatalytic synthesis of N-acyl sulfonamides from sodium sulfinates and hydroxamic acids or N-hydroxycarbamates (selected examples are given). >20 examples, up to 95% yields R1, R2, R3, R4 = Ar, Alk [(tBuCO2)4Rh2] (cat.), CHCl3 R3 O S 4A mol sieves, 70 °C N N N S O O R2 R1 R4 N S O O R2R1 R3 S R4 O H H N S O O Tol Tol Me S Ph O H N S O O Tol Me S Ph O H N S O O Me Ph Me S Ph O H N S O O t-Bu Ph Me S Ph O H N S O O Tol Ph Me S Et O H N S O O Tol Ph Ph S Ph O H N S O O Tol Ph Me S Ph O H N S O O TolPh O S H 95% 89% 80% 78% 86% 67% 78% 84% NHBoc Scheme 28. Reaction of triazoles with thioesters leading to N-acyl sulfur-containing sulfonamides (selected examples are given). O.V. Gavrylenko et al. 21 >40 examples, up to 95% yields, R1, R2, R3 = Ar, Alk Rh2Piv4 (cat.) R2 O Se PhMe, 100 °C N N N S O O R1 Ar1 R3 N S O O R1Ar1 R2 Se R3 O H H N S O O Tol Tol Me Se Ph O H N S O O Tol Me Se Ph O H N S O O Tol Ph Bn Se Ph O H N S O O pCNC6H4 Ph Me Se Ph O H N S O O Tol Ph Me Se Ph O H N S O O i-PrPh O Ph Se H 95% 95% 63% 69% 95% 57% Me S Scheme 29. Synthesis of N-acyl selenium-containing sulfonamides via Rh-catalyzed reaction of triazoles with acyl selenides (selected examples are given). 15 examples, up to 98% yields, R1, R2, R3, R4, R5 = Ar, Alk, H Cu(OTf)2/AgBF4 (cat.) SiO2, (CH2Cl)2, rt R3 N R2 S O N R2 S O O R1 85% 95% 87% O N O R5 R4 R1 N N O R3 R4 R5 O N Ph S O O Tol O O N Ph S O O Tol O Ph O Et N Ph S O O Tol O O N Boc 98% 81% 72% (dr >20/1) N Ph S O O Tol O O N Me S O O Me O Ph O Et N Me S O O Tol O H O Ph O O Scheme 30. Copper-catalyzed synthesis of N-acyl sulfonamides from N-alkynyl sulfonamides (selected examples are given). Finally, another interesting approach involves the transacylation of N-acyl sulfonamides. The described study proposes a general method for FeCl3-catalyzed trans- acylation, in which acetic anhydride serves as the new acylating agent (Scheme 31). The dual role of FeCl3 relies in the simultaneous catalysis of the non-hydrolytic deacylation and subsequent re-acylation of the formed sulfonamide. In addition to FeCl3, GaCl3 and RuCl3·xH2O were also shown to be good catalysts [40]. Conclusions The multitude of synthetic methods available for N-acyl sulfonamide construction underscores the versatility and importance of this functional group in organic and N S R1 O O Me O S R1 O O 97% 96% 94% Ac2O (access), rtN >20 examples, up to 99% yields R1, R2 = Ar, Alk; R3 = Ar, Alk, H 99% 91% 93% R2 O FeCl3 (cat.) S Tol O O N H 1-naphtyl O S Ph O O N H n-Bu O S Bn O O N H n-Bu O S Tol O O N O S Tol O O N t-Bu O S Me O O N t-Bu O R3 R3 Bn Me Ph Scheme 31. FeCl3-catalyzed transacylation of N-acyl sulfon- amides (selected examples are given). medicinal chemistry. Classical acylation techniques (reacting sulfonamides with acyl chlorides or anhydrides) remain the common solutions for straightforward cases, offering simplicity and high yields. At the same time, newer catalytic approaches address more demanding synthetic scenarios. For instance, the use of heterogeneous and reusable acid catalysts (silica-supported phosphates, heteropoly acids, modified clays, etc.) has enabled greener, solvent-free or aqueous protocols without compromising efficiency. Many of these catalyst systems can be recycled multiple times, aligning with principles of sustainability while still delivering N-acyl sulfonamides in good to excellent yields. The ability to carry out one-pot sulfonylation-acylation sequences further streamlines synthesis by avoiding intermediate isolation. Notably, some recently developed protocols can produce the target compounds in a matter of minutes under very mild conditions (e.g. ultrasound- promoted sulfonylations). In addition to improving traditional routes, cutting-edge methodologies have expanded the chemical space of N-acyl sulfonamides. The integration of sulfonyl azide in copper- catalyzed multicomponent reactions and palladium- catalyzed carbonylations allow the incorporation of N-acyl sulfonamide motifs into complex molecular frameworks, e.g., azoles, or even DNA-linked substrates. Overall, the field of N-acyl sulfonamide synthesis has evolved, where researchers can choose from an extensive toolkit of methods to suit their specific substrate requirements, functional group compatibilities, and environmental considerations. As further improvements in catalytic methods and novel reaction paradigms emerge, one can expect the synthesis of N-acyl sulfonamides to become even more streamlined, adaptable, and suitable for the parallel syntheses, thereby accelerating the discovery and development of new therapeutic agents decorated with this functional group. Notes Acknowledgments. The authors thank all the brave defenders of Ukraine that stood against the russian full- scale invasion and made this publication possible. ISSN 1814-9758. Ukr. Bioorg. Acta, 2025, Vol. 20, N 2 22 The authors declare no conflict of interest. Author contributions. The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. References 1. Ammazzalorso, A.; De Filippis, B.; Giampietro, L.; Amoroso, R. N-acylsulfonamides: synthetic routes and biological potential in medicinal chemistry. Chem. Biol. Drug Des. 2017, 90, 1094-1105. 2. 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Мороз1,3,4 1 ТОВ НВП «Єнамін» (www.enamine.net), Київ, Україна 2 Київський національний університет імені Тараса Шевченка, Київ, Україна 3 Науково-дослідний інститут (НДІ) «Єнамін», Київ, Україна 4 ТОВ "Кемспейс", Київ, Україна Резюме: N-Ацилсульфонаміди є широко застосовуваними біоізостерами карбонових кислот, цінними завдяки сприятливим фізико-хімічним та фармакокінетичним властивостям і поширеному використанню у структурах лікарських засобів. У цьому огляді узагальнено основні синтетичні підходи до цих сполук, охоплюючи як класичні, так і новітні методи з акцентом на каталітичні, екологічні та прості у виконанн і підходи. Найпоширеніші методи включають безпосереднє N-ацилювання сульфонамідів та N-сульфонілювання карбоксамідів, а також перетворення за участі сульфонілазидів, сульфонілізоціанатів і споріднених багатокомпонентних процесів. Останні розробки полягають у застосув анні гетерогенних каталізаторів, здатних до регенерування та багаторазового використання, водних розчинів або проведння реакцій без розчинника, а також у застосуванні реакцій карбонілювання, фотокаталітичних реакцій утворення зв'язків S-N та перетворення за участю перехідних металів, які підкреслюють простоту та ефективність підходів. Ці досягнення формують адаптивний і ефективний інструментарій для синтезу різноманітних N-ацилсульфонамідів, важливих для сучасної органічної та медичної хімії. Ключові слова: N-ацилсульфонаміди; зелена хімія; каталіз; біоізостери.
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spelling oai:ojs2.bioorganica.com.ua:article-1032026-06-29T15:59:56Z Synthesis of N-acyl sulfonamides: from common acylation reactions to modern catalytic and sustainable methods Синтез N-ацилсульфонамідів: від загальновідомих реакцій ацилювання до сучасних каталітичних і сталих методів Gavrylenko, Oleksii V. Sosunovych, Bohdan S. Vashchenko, Bohdan V. Grygorenko, Oleksandr O. Moroz, Yurii S. N-acyl sulfonamides green chemistry catalysis bioisosteres N-ацилсульфонаміди зелена хімія каталіз біоізостери N-Acyl sulfonamides are widely used bioisosteres of carboxylic acids, valued for their favorable physicochemical and pharmacokinetic properties as well as their frequent occurrence in drug-like molecules. This review summarizes the principal synthetic approaches to these motifs, covering both established and emerging methodologies, with emphasis on catalytic, green, and operationally simple approaches. Common strategies include direct N-acylation of sulfonamides and N-sulfonylation of carboxamides, as well as transformations employing sulfonyl azides, sulfonyl isocyanates, and related multicomponent processes. Recent developments, such as recyclable heterogeneous catalysts, solvent-free and aqueous conditions, carbonylative and photocatalytic S-N couplings, and mild transition-metal-mediated reactions highlight simplicity and sustainability. Collectively these advances provide an adaptable and efficient synthetic toolbox for accessing diverse N-acyl sulfonamides relevant to modern organic and medicinal chemistry. N-Ацилсульфонаміди є широко застосовуваними біоізостерами карбонових кислот, цінними завдяки сприятливим фізико-хімічним та фармакокінетичним властивостям і частому використанню у структурах лікарських засобів. У цьому огляді узагальнено основні синтетичні підходи до цих сполук, охоплюючи як класичні, так і новітні методи з акцентом на каталітичні, екологічні та прості у виконанні підходи. Найпоширеніші методи включають безпосереднє N-ацилювання сульфонамідів та N-сульфонілювання карбоксамідів, а також перетворення за участі сульфонілазидів, сульфонілізоціанатів і споріднених багатокомпонентних процесів. Останні розробки полягають у застосуванні гетерогенних каталізаторів, здатних до регенерування та багаторазового використання, водних розчинів або проведння реакцій без розчинника, а також у застосуванні реакцій карбонілювання, фотокаталітичних реакцій утоврення зв'язків S-N та перетворення за участі перехідних металів, які підкреслюють простоту та ефективність підходів. Ці досягнення формують адаптивний і ефективний інструментарій для синтезу різноманітних N-ацилсульфонамідів, важливих для сучасної органічної та медичної хімії. V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry of the National Academy of Sciences of Ukraine 2025-12-31 Article Article application/pdf https://bioorganica.com.ua/index.php/journal/article/view/103 10.15407/bioorganica2025.02.013 Ukrainica Bioorganica Acta; Vol. 20 No. 2 (2025): Ukrainica Bioorganica Acta; 13-23 Ukrainica Bioorganica Acta; Том 20 № 2 (2025): Ukrainica Bioorganica Acta; 13-23 1814-9766 1814-9758 10.15407/bioorganica2025.02 en https://bioorganica.com.ua/index.php/journal/article/view/103/100 Copyright (c) 2025 Oleksii V. Gavrylenko, Bohdan S. Sosunovych, Bohdan V. Vashchenko, Oleksandr O. Grygorenko https://creativecommons.org/licenses/by/4.0
spellingShingle N-ацилсульфонаміди
зелена хімія
каталіз
біоізостери
Gavrylenko, Oleksii V.
Sosunovych, Bohdan S.
Vashchenko, Bohdan V.
Grygorenko, Oleksandr O.
Moroz, Yurii S.
Синтез N-ацилсульфонамідів: від загальновідомих реакцій ацилювання до сучасних каталітичних і сталих методів
title Синтез N-ацилсульфонамідів: від загальновідомих реакцій ацилювання до сучасних каталітичних і сталих методів
title_alt Synthesis of N-acyl sulfonamides: from common acylation reactions to modern catalytic and sustainable methods
title_full Синтез N-ацилсульфонамідів: від загальновідомих реакцій ацилювання до сучасних каталітичних і сталих методів
title_fullStr Синтез N-ацилсульфонамідів: від загальновідомих реакцій ацилювання до сучасних каталітичних і сталих методів
title_full_unstemmed Синтез N-ацилсульфонамідів: від загальновідомих реакцій ацилювання до сучасних каталітичних і сталих методів
title_short Синтез N-ацилсульфонамідів: від загальновідомих реакцій ацилювання до сучасних каталітичних і сталих методів
title_sort синтез n-ацилсульфонамідів: від загальновідомих реакцій ацилювання до сучасних каталітичних і сталих методів
topic N-ацилсульфонаміди
зелена хімія
каталіз
біоізостери
topic_facet N-acyl sulfonamides
green chemistry
catalysis
bioisosteres
N-ацилсульфонаміди
зелена хімія
каталіз
біоізостери
url https://bioorganica.com.ua/index.php/journal/article/view/103
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