Dialkyl Phosphite-Initiated Cyclopropanation of α,β-Unsaturated Ketones Using α-Ketoesters or Isatin Derivatives
作者:Deng Yin、Hui Liu、Chong-Dao Lu、Yan-Jun Xu
DOI:10.1021/acs.joc.6b03009
日期:2017.3.17
cyclopropanation of α,β-unsaturated ketones using α-ketoesters or isatin derivatives is reported. The cyclopropanation reaction occurs via a cascade transformation that starts with addition of deprotonated dialkyl phosphite to the keto groups of α-ketoesters or isatin derivatives, followed by [1,2]-phosphonate/phosphate rearrangement to generate α-phosphonyloxyenolate intermediates, which are trapped by α,β-unsaturated
报道了使用α-酮酸酯或伊斯汀衍生物对α,β-不饱和酮进行有效的环丙烷化。环丙烷化反应是通过级联转化而发生的,该级联转化是将去质子化的亚磷酸二烷基酯添加到α-酮酸酯或靛红衍生物的酮基上,然后进行[1,2]-膦酸酯/磷酸酯重排,生成α-膦酰基氧烯酸酯中间体,将其捕获通过迈克尔加成/环闭合反应制得α,β-不饱和酮。该方案用于以极高的非对映选择性高产率合成具有1,2-顺-1,3-反式构型的四取代环丙烷。