methyl (2R)-2-((1S,2R,3aR,5aR,6R,7R,8R,8aR,8bS)-2-(5-((tert-butyldimethylsilyl)oxy)-2-hydroxypentan-2-yl)-8-hydroxy-4,7-dimethyl-6-((triisopropylsilyl)oxy)-1,2,3,3a,5a,6,7,8,8a,8b-decahydro-as-indacen-1-yl)-3-oxopropanoate 以
甲苯 为溶剂,
以22%的产率得到(-)-(1R,2R,3R,3aR,5aR,6aR,7S,10aS,10bR,10cR)-7-[3-(tert-butyldimethylsilanyloxy)-propyl]-1-hydroxy-2,5,7-trimethyl-3-triisopropylsilanyloxy-2,3,3a,5a,6,6a,7,10a,10b,10c-decahydro-1H-8-oxa-cyclopenta[c]fluorene-10-carboxylic acid methyl ester