(2S)-tert-butyl 2-((1S)-2-chloro-1-((tetrahydro-2H-pyran-2-yl)oxy)ethyl)aziridine-1-carboxylate

tert-butyl ((2R,3S)-1,4-dichloro-3-((tetrahydro-2H-pyran-2-yl)oxy)butan-2-yl)carbamate

tert-butyl ((2S,3S)-4-chloro-1-phenyl-3-((tetrahydro-2H-pyran-2-yl)oxy)butan-2-yl)carbamate

2(S)-t-butyldimethylsilyloxy-3(S)-(t-butyloxycarbonyl)amino-1-chloro-4-phenylbutane

(3S)-t-butyldimethylsilyloxy-(2R)-(t-butyloxycarbonyl)amino-4-chloro-1-phenylthiobutane