An efficient and highly enantioselective synthesis of (S)-(−)-5,6-difluoro-2-methyl-1,2,3,4-tetrahydroquinoline(4b), a keyintermediate in the synthesis of (S)-(−)-nadifloxacin (2), was carried out by using a cross-coupling reaction. Also α,β-acetylenic ketones 14a,b underwent an asymmetricreduction using various chiral reagents to afford the corresponding propargylic alcohols 8a,b in good yield and