Phosphonates containing sulfur and selenium. Synthesis of vinylphosphonates bearing α-sulfenyl, α-selenenyl, α-sulfinyl and α-seleninyl moieties and studies on nucleophilic addition
作者:Wanda H. Midura、Jerzy A. Krysiak
DOI:10.1016/j.tet.2004.10.026
日期:2004.12
efficiently to α-phosphorylvinyl sulfoxides or α-phosphorylvinyl selenides depending on the reaction conditions. Oxidation of α-phosphorylvinyl selenides and subsequent thermolysis of selenoxides afford alkynylphosphonates. Studies of the stereochemical course of nucleophilic addition to α-phosphoryl sulfoxides show high facial stereoselectivity of the reaction, however, epimerisation at the α-carbon atom leads
A facile synthesis of γ-butyrolactones by the lactonization of γ-halo esters with silica gel catalyst and its application to the stereoselective synthesis of (±)-canadensolide are described.