Reinvestigation of the Wadsworth-Emmons reaction involving lithium difluoromethylenephosphonate
作者:Serge R. Piettre、Leonora Cabanas
DOI:10.1016/0040-4039(96)01267-1
日期:1996.8
published reaction conditions for the Wadsworth-Emmons transformation of ketones or aldehydes into 1,1-difluoroolefins with lithium difluoromethy-lenephosphonate failed to give the expected product, affording instead phosphates of the general structure 9 in a nearly exclusive fashion. As variations of the conditions did not bring any change to the unexpected course taken by the reaction, a new procedure
用公开的反应条件,用二氟甲基-亚乙基膦酸锂将酮或醛的Wadsworth-Emmons转化为1,1-二氟烯烃,不能得到预期的产物,而是以几乎排他的方式提供了一般结构9的磷酸盐。由于条件的变化不会改变反应的意外过程,因此制定了新的程序,该程序可重复制备所需的二氟烯烃。