ethyl 4-(phenylsulfonamido)hex-5-enoate

5-bromo-3-(carbobenzyloxy)amino-1-pentene

3-(carbobenzyloxy)amino-4-penten-1-ol

(E)-6-hydroxy-hex-4-enoic acid ethyl ester

ethyl 4-(2,2,2-trichloroacetamido)hex-5-enoate