methyl 4-(diethylphosphono)crotonate 、
(2R,3R,4R,5S,6R)-5,7-di-[(tert-butyldimethylsilyl)oxy]-3-(4-methoxybenzyl)oxy-2,4,6-trimethylheptanal 在
lithium diisopropyl amide 作用下,
以
四氢呋喃 为溶剂,
反应 3.0h,
以2.61 g的产率得到(2E,4E)-(6S,7S,8R,9S,10R)-9,11-bis-(tert-butyl-dimethyl-silanyloxy)-7-(4-methoxy-benzyloxy)-6,8,10-trimethyl-undeca-2,4-dienoic acid methyl ester