tert-butyl (2R,3R,4S)-2-tert-butyldiphenylsilyloxymethyl-3,4-epoxypyrrolidine-1-carboxylate

tert-butyl (2R,3R,4R)-4-azido-2-tert-butyldiphenylsilyloxymethyl-3-hydroxy-pyrrolidine-1-carboxylate

tert-butyl (2R,3S,4R)-4-tert-butoxycarboxamido-2-tert-butyldiphenylsilyloxymethyl-3-hydroxy-pyrrolidine-1-carboxylate

tert-butyl (2R,3S,4R)-4-tert-butoxycarboxamido-2-tert-butyldiphenylsilyloxymethyl-3-mesyloxy-pyrrolidine-1-carboxylate

(2R,3S)-tert-butyl 3-hydroxy-2-(hydroxymethyl)pyrrolidine-1-carboxylate