One-Pot Method for Stereoselective Cyclopropanation of Electron-Deficient Olefins with Methyl Bromoacetate and Phenacyl Bromide in the Presence of Triphenylarsine
作者:Zhongjiao Ren、Weiguo Cao、Weiyu Ding、Yu Wang
DOI:10.1055/s-2005-916035
日期:——
triphenylarsine-catalyzed one-pot procedure for the preparation of cis-cyclopropanes with acyclic electron-deficient olefins with carbonyl-stabilized arsonium ylides formed from methyl bromoacetate or phenacyl bromide in the presence of NaHCO 3 has been achieved. This method is simple, high-yielding and cis-selective. The success of this method depends on the choice of base solvent and temperature.
Stereoselective Synthesis of <i>cis</i>‐1‐Aryl‐2‐benzoyl‐3,3‐dicyanocyclopropanes in the Presence of KF·2H<sub>2</sub>O
作者:Zhongjiao Ren、Weiguo Cao、Weiyu Ding、Yu Wang、Lilin Wang
DOI:10.1081/scc-200032500
日期:2004.1.1
Abstract KF · 2H2O was found to be a highly efficient base for synthesis of cis‐1,2‐cyclopropanes with arsonium salt and olefins. The advantages of the process are mild reaction condition, easy workup, excellent yields, and high stereoselectivity.
Abstract The highly stereoselective preparation of cis‐1‐aryl‐2‐benzoyl‐3,3‐dicyanocyclopropanes with arsonium salt and olefin in water is described. It is simple, efficient, and environmentally benign.
A new stereoselective approach for the synthesis of substituted 3-cyclopropylmethylene-1,3-dihydro-indol-2-one via the condensation reaction of cis-1-aryl-2-benzoyl-3,3-dicyanocyclopropanes with oxindole in water
作者:Dong Zhou、Haigang Yu、Ying Liu、Jie Chen、Hongmei Deng、Min Shao、Zhongjiao Ren、Weiguo Cao
DOI:10.1016/j.tetlet.2010.08.025
日期:2010.10
A new stereoselective approach for the synthesis of substituted 3-cyclopropylmethylene-1,3-dihydroindol-2-one via the condensation reaction of cis-1-aryl-2-benzoyl-3,3-dicyanocyclopropanes with oxindole in water was achieved. (C) 2010 Elsevier Ltd. All rights reserved.
Novel Procedure for Highly Stereoselective Synthesis of Bicyclic Cyclopropane‐lactam with <i>cis</i>‐2‐Aryl‐1‐benzoyl‐3,3‐dicyanocyclopropane and 2‐Cyanomethyl‐1,3‐benzothiazole in Water