(Z,2S,3S,8R,9R)-9-tert-butyldiphenylsilanyloxymethyl-8-chloro-3-hydroxy-2-hydroxymethyl-2,3,4,7,8,9-hexahydro-oxonine 、
4-甲氧基苯甲醛 在
4-甲基苯磺酸吡啶 作用下,
以
苯 为溶剂,
反应 18.0h,
以77%的产率得到(Z,2R,4aS,6R,7R,11aS)-6-tert-butyldiphenylsilanyloxymethyl-7-chloro-2-(4-methoxyphenyl)-4a,6,7,8,11,11a-hexahydro-4H-1,3,5-trioxa-benzocyclononene