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.
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
作者:Zhongjiao Ren、Weiguo Cao、Jie Chen、Yeying Lu
DOI:10.1080/00397910601038848
日期:2007.2.1
A novel synthesis of 5-aryl-3-phenylpyrazole from 2-aryl-3-benzoyl-1,1-cyclopropanedicarbonitrile and hydrazine
A new process for synthesis of 5-aryl-3-phenylpyrazole is achieved. The regioselective ring-opening reaction of 2-aryl-3-benzoyl-1,1-cyclopropanedicarbonitrile with hydrazine plays a crucial role in the described process.