(S)-2-Methyl-butyric acid (1S,3R,4S,4aR,7S,8S,8aR)-4-(tert-butyl-dimethyl-silanyloxy)-8-{2-[(4R,6S)-6-(2-hydroxy-ethyl)-2,2-dimethyl-[1,3]dioxan-4-yl]-ethyl}-3,7-dimethyl-1,2,3,4,4a,7,8,8a-octahydro-naphthalen-1-yl ester 在
重铬酸吡啶 、 Collins oxidation agent 作用下,
生成 (S)-2-Methyl-butyric acid (1S,3R,4S,4aR,7S,8S,8aR)-4-(tert-butyl-dimethyl-silanyloxy)-8-[2-((4R,6R)-6-carboxymethyl-2,2-dimethyl-[1,3]dioxan-4-yl)-ethyl]-3,7-dimethyl-1,2,3,4,4a,7,8,8a-octahydro-naphthalen-1-yl ester