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
根据反应条件,外消旋和旋光性α-磷酰基亚砜的硒烯基化是关键步骤,可有效地导致α-磷酰基乙烯基亚砜或α-磷酰基乙烯基硒化物。α-磷酰基乙烯基硒化物的氧化和随后硒氧化物的热解提供了炔基膦酸酯。对亲核加成至α-磷酰基亚砜的立体化学过程的研究表明,该反应具有较高的面部立体选择性,但是,在α-碳原子上的差向异构化会导致非对映异构体的混合物。