Easy and Stereoselective Synthesis
of Cyclopropyl-Substituted Phosphonates via α-Chlorophosphonates
作者:K. Kumara Swamy、K. Pavan Kumar、R. Rama Suresh、N. Satish Kumar
DOI:10.1055/s-2007-966032
日期:——
reaction of inexpensive α-chlorophosphonates with alkyl acrylates in the presence of sodium hydride is reported. Reaction with dimethyl maleate or fumarate also leads to cyclopropyl-substituted phosphonates. These reactions take place via Michael addition of acrylate, dimethyl maleate, or fumarate to the phosphonate carbanion, followed by expulsion of the chloride ion.
报道了在氢化
钠存在下,通过廉价的 α-
氯膦酸盐与
丙烯酸烷基酯的反应,简便地立体选择性合成
环丙基膦酸盐。与
马来酸二甲酯或
富马酸二甲酯的反应也产生环丙基取代的
膦酸盐。这些反应通过将
丙烯酸酯、
马来酸二甲酯或
富马酸加成到
膦酸负碳离子上,然后排出
氯离子而发生。