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 novel synthesis of cyclopropyl lactam and amide from<i>cis</i>-2-aryl-3-benzoyl-1,1-dicynocyclopropane with H<sub>2</sub>O<sub>2</sub>in the presence of NaHCO<sub>3</sub>
作者:Zhongjiao Ren、Jie Chen、Yeying Lu、Danyi Wu、Weiguo Cao
DOI:10.1002/jhet.5570440503
日期:2007.9
The process for preparation of cyclopropyllactam and amide from cis-2-aryl-3-benzoyl-1,1-dicynocyclopropane with H2O2 in the Presence of NaHCO3 is described. The highly stereoselective conversion of monocyano group to amide has been carried out in the present method.
描述了在NaHCO 3存在下由顺式-2-芳基-3-苯甲酰基-1,1-二壬基环丙烷与H 2 O 2制备环丙基内酰胺和酰胺的方法。在本方法中已经进行了单氰基向酰胺的高度立体选择性的转化。
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.
Highly Stereoselective Cyclopropanation of Olefins Catalyzed by a Novel<i>C</i><sub>3</sub>-Symmetric Arsine
作者:Changqing Wang、Yanping Yi、Daoan Xiao、Rong Zhou、Hui Liang、Guangquan Mei
DOI:10.1080/00397911.2013.817018
日期:2014.2.16
A novel C-3-symmetric arsine was employed in the one-pot cyclopropanation of olefins with carbonyl-stabilized arsonium ylides formed in situ from phenacyl bromide in the presence of NaHCO3. This new arsine demonstrates good stereoselectivity and activity in the one-pot cyclopropanation of arylidenemalononitrile. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) for the following free supplemental resource(s): Full experimental and spectral details.]