(+)-(2E,4E,9E,11E,14E)-(6R,7R,8R)-18-(tert-butyldimethylsilanyloxy)-2-hydroxy-6-triethylsilanyloxy-8-triisopropylsilanyloxy-7,11,15-trimethyl-octadeca-2,4,9,11,14-pentaenoic acid methyl ester 在
manganese(IV) oxide 作用下,
以
二氯甲烷 为溶剂,
反应 48.0h,
以28%的产率得到(-)-(1R,2S,3R,3aR,5aR,6aR,7S,10aS,10bR,10cR)-7-[3-(tert-butyldimethylsilanyloxy)-propyl]-1-triethylsilanyloxy-3-triisopropylsilanyloxy-2,5,7-trimethyl-2,3,3a,5a,6,6a,7,10a,10b,10c-decahydro-1H-8-oxa-cyclopenta[c]fluorene-10-carboxylic acid methyl ester