Phosphonates containing sulfur and selenium: The first synthesis of α-phosphorylvinyl selenides and selenoxides and a new synthetic approach to alkynylphosphonates
作者:Wanda H. Midura、Marian Mikolajczyk
DOI:10.1016/0040-4039(95)00371-i
日期:1995.4
An efficient, two-step synthesis of alpha-phosphorylvinyl selenides 4 from a-phosphoryl sulfoxides 1 is described which involves selenenylation reaction and subsequent thermal sulfoxide elimination. Oxidation of 4 leads to alpha-phosphorylvinyl seienoxides 5 which upon thermoiysis afford alkynylphosphonates 6.
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