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
Preparation of New Wittig Reagents and Their Application to the Synthesis of α,β-Unsaturated Phosphonates
作者:Yibo Xu、Michael T. Flavin、Ze-Qi Xu
DOI:10.1021/jo9608275
日期:1996.1.1
The Wittig reagent [(diethoxyphosphinyl)methylidene]triphenylphosphorane (1b) has been successfully synthesized for the first time via its phosphonium triflate salt (4a), by treating (diethoxyphosphinyl)methyl triflate with triphenylphosphine. The procedure has been applied to the synthesis of other phosphoranes and phosphonium salts. The new Wittig reagents thus synthesized were treated with various
Stereoselective syntheses of mono-, di- and trisubstituted diethyl alk-l-enylphosphonates, starting from readily available alk-1ynylphosphonates, have been developed, using catalytic hydrogenation or cuprate addition on the triple bond.
<i>cis-</i>Vinylphosphonates and 1,3-Butadienylphosphonates by Zirconation of 1-Alkynylphosphonates
作者:Abed Al Aziz Quntar、Morris Srebnik
DOI:10.1021/ol0157454
日期:2001.5.1
[GRAPHICS]Addition of "zirconocene" to 1-alkynylphosphonates gives three-membered zirconacylces that can be hydrolyzed to cis-vinylphosphonates or further reacted with alkynes/hydrolysis to give substituted (Z,E)- and (E,E)-1,3-butadienylphosphonates.
A novel stereoselective synthesis of (E)-2-arylvinylphosphonates in InCl3–NaBH4–MeCN system
作者:Chunyan Wang、Yuanjiang Pan、Deyu Yang
DOI:10.1016/j.jorganchem.2005.01.024
日期:2005.3
Hydroindation of arylalkynylphosphonates gives a intermediate which can be hydrolyzed to (E)-2-arylvinylphosphonates in InCl3-NaBH4 MeCN system, the stereoselectivity and yield are rather high, but under the same conditions 2-alkylalkynylphosphonates do not react very well. (c) 2005 Elsevier B.V. All rights reserved.