Easy and Stereoselective Synthesis of Cyclopropyl-Substituted Phosphonates via α-Chlorophosphonates

摘要

A facile stereoselective synthesis of cyclopropylphos-phonates from the reaction of inexpensive a-chlorophosphonates with alkyl acrylates in the presence of sodium hydride is reported. Reaction with dimethyl maleate or fumarate also leads to cyclopro-pyl-substituled 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.