(4R)-4-(1-hydroxy-allyl)-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

(R)-4-(S)-2,5-Dihydro-furan-2-yl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

((R)-1-(S)-2,5-Dihydro-furan-2-yl-2-hydroxy-ethyl)-carbamic acid tert-butyl ester

carbonic acid allyl ester (2S,3R)-2-(9H-fluoren-9-ylmethoxycarbonylamino)-3-hydroxy-pent-4-enyl ester

(4aR,8aR)-7,8-Dihydroxy-2,2-dimethyl-hexahydro-[1,3]dioxino[5,4-b]pyridine-5-carboxylic acid tert-butyl ester

(4aR,8S,8aR)-tert-butyl hexahydro-8-hydroxy-2,2-dimethyl[1,3]dioxino[5,4-b]pyridine-5-carboxylate

tert-butyl N-[(1R)-1-((2R)-2,5-dihydrofuran-2-yl)-2-hydroxyethyl]carbamate

(2R,3R)-2-Benzyloxy-3-tert-butoxycarbonylamino-4-hydroxy-butyric acid methyl ester

(2S,3R)-2-Benzyloxy-3-tert-butoxycarbonylamino-4-hydroxy-butyric acid methyl ester

((3R,4S)-4-Methoxy-5-oxo-tetrahydro-furan-3-yl)-carbamic acid tert-butyl ester

((3R,4S)-4-Benzyloxy-5-oxo-tetrahydro-furan-3-yl)-carbamic acid tert-butyl ester

(R)-4-(R)-2,5-Dihydro-furan-2-yl-2,2-dimethyl-oxazolidine-3-carboxylic acid tert-butyl ester

(2S,3S)-2-Benzyloxy-3-tert-butoxycarbonylamino-succinic acid 1-methyl ester