amino acids α- і β-амінокислоти амінокислоти Sulfoxides UDC 547.321 547.74 amines asymmetric synthesis aсиметричний синтез biomimetic reductive amination cyclization drug design drug design and development enaminones enones fluorinated compounds fluorine fluorine-containing compounds indolizidine pharmaceuticals polyfluoroalkyl pyrroles pyrrolizidine quinolizidine alkaloids synthetic strategies α- and β-Amino acids α- and β-amino acids α-Fluoroalkyl amino derivatives α-фторалкіламінопохідні УДК 547.321 547.74 аминокислоты аміни