By treatment with stabilized lithium phosphonates in the presence of activated 4Å molecular sieves, unprotected α-hydroxy ketones 1 undergo a convenient Horner-Wadsworth-Emmons olefination to give directly butenolides 3 as exclusive or predominant products.
通过在活化的4Å
分子筛存在下用稳定的
膦酸锂处理,未保护的α-羟基酮1会进行便利的Horner-Wadsworth-Emmons烯化反应,直接生成
丁烯化物3作为独家或主要产品。