α-Ethylidenecycloalkanones underwent a ring enlargement to β-alkylidenecycloalkanones upon a treatment with trimethylstannyllithium/aldehyde equivalents/Lewis acids with high stereoselectivity.
α-乙基亚环烯酮在与
三甲基锡锂/醛等价物/
路易斯酸处理下,发生了环膨胀,转化为β-烷基亚环烯酮,且具有高的立体选择性。