(3aR,5aR,6S,9R,10aR,Z)-6-((2S,3R,4S,5R)-5-benzyloxy-4-hydroxy-3-triethylsilyloxy-tetrahydro-2H-pyran-2-yloxy)-8-(hydroxymethyl)-1-isopropyl-3a,5a-dimethyl-2,3,3a,4,5,5a,6,9,10,10a-decahydrocyclohepta[e]inden-9-yl benzoate 在
草酰氯 、
二甲基亚砜 、
三乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 14.0h,
以93%的产率得到(3bR,6aR,6bS,8R,10aS,11aS,11bR,13aR)-1,2,3b,4,6a,6b,8,9,10a,11a,11b,12,13,13a-tetradecahydro-8-benzyloxy-6b-triethylsilyloxy-11b,13a-dimethyl-3-(1-methylethyl)-7-oxo-7H-indeno[5'',4'':3',4']cyclohepta[1',2':4,5]furo[2,3-b]pyran-6-carboxaldehyde