(4S,6R)-6-(hydroxymethyl)-6-methyl-3,4,5,6-tetrahydropyrimidine-4-carboxylic acid

tert-butyl (3S,5R)-5-methyl-2-oxotetrahydro-2H-pyran-3,5-diyldicarbamate

(R)-Δ2-5-hydroxymethyl-5-methyl-3-pyrazolinecarboxylic acid ethyl ester

ethyl (2R)-4-(tert-butyldiphenylsilyloxymethyl)-2-hydroxy-4-pentenoate

(4R,6R)-4-(tert-Butyl-diphenyl-silanyloxymethyl)-4-methyl-2,2-dioxo-2λ6-[1,2,3]oxathiazinane-3,6-dicarboxylic acid 3-tert-butyl ester 6-ethyl ester

(4S,6R)-6-(tert-Butyl-diphenyl-silanyloxymethyl)-6-methyl-5,6-dihydro-4H-pyrimidine-1,4-dicarboxylic acid 1-tert-butyl ester 4-ethyl ester

(4R,6R)-4-(tert-Butyl-diphenyl-silanyloxymethyl)-4-methyl-2,2-dioxo-2λ6-[1,2,3]oxathiazinane-6-carboxylic acid ethyl ester

(2R,4S)-2,4-Bis-tert-butoxycarbonylamino-5-hydroxy-2-methyl-pentanoic acid methyl ester

(R)-Δ2-5-formyl-5-methyl-3-pyrazolinecarboxylic acid ethyl ester

(3-tert-butoxycarbonylamino-4-hydroxy-1-methyl-butyl)-carbamic acid tert-butyl ester

(2R,4S)-2,4-Diamino-5-hydroxy-2-methyl-pentanoic acid