Synthesis of β-ketophosphonates via AgNO3-catalyzed hydration of alkynylphosphonates: a rate-enhancement effect of methanol
作者:Jiannan Xiang、Niannian Yi、Ruijia Wang、Linghui Lu、Huaxu Zou、Yuan Pan、Weimin He
DOI:10.1016/j.tet.2014.12.001
日期:2015.1
beta-Ketophosphonates were prepared via AgNO3-catalyzed hydration of alkynylphosphonates with a dramatic rate-enhancement effect of methanol. This benign aqueous-methanol method catalyzed by a low-(c)ost catalyst has simple, atom-economical procedure, and was used effectively with a wide range of substrates. (C) 2014 Elsevier Ltd. All rights reserved.
A facile synthesis of 2-oxo-cyclopentenylphosphonates by carbonylation of zirconacyclopentenylphosphonate with oxalyl chloride
作者:Abed Al Aziz Al Quntar
DOI:10.1016/j.tetlet.2014.01.094
日期:2014.2
Addition of oxalyl chloride to zirconacycles prepared from 1-alkynylphosphonates 1 zirconocene dichloride, and two equivalents of EtMgBr smoothly produced novel 2-oxo-cyclopentenylphosphonates 6 in 58-81% isolated yields in the presence of a copper catalyst. (c) 2014 Elsevier Ltd. All rights reserved.
Direct formation of cyclobutenylphosphonates from 1-alkynylphosphonates and Cp2ZrCl2/2EtMgCl/2CuCl
作者:Yulia Sinelnikove、Abraham Rubinstein、Morris Srebnik、Abed Al Aziz Al Quntar
DOI:10.1016/j.tetlet.2008.11.108
日期:2009.2
Zirconacycles 2 prepared from 1-alkynylphosphonates 1, zirconocene dichloride, and 2 equiv of EtMgCl are smoothly converted into cyclobutenylphosphonates 3 when treated with two equiv of CuCl in 65-81% isolated yield. The reaction is specific and general only for zirconacyclopentenyl phosphonates. (C) 2008 Elsevier Ltd. All rights reserved.