(S)-3-amino-6-(tert-butyldiphenylsilanyloxymethyl)-1-(toluene-4-sulfonyl)-1,6-dihydropyridine-2,5-dione

(2S,3S,6R)-2-(tert-Butyl-diphenyl-silanyloxymethyl)-6-methoxy-1-(toluene-4-sulfonyl)-1,2,3,6-tetrahydro-pyridin-3-ol

(2S,6R)-2-(tert-butyl-diphenylsilanyloxymethyl)-6-methoxy-1-(toluene-4-sulfonyl)-1,6-dihydro-2H-pyridine-3-one

(2S,6R)-2-(tert-butyl-diphenylsilyloxymethyl)-6-hydroxy-1-(toluene-4-sulfonyl)-1,6-dihydro-2H-pyridine-3-one

(2S,6S)-2-(tert-Butyl-diphenyl-silanyloxymethyl)-6-ethoxy-1-(toluene-4-sulfonyl)-1,6-dihydro-2H-pyridin-3-one