SnCl_2/nano SiO_2: A green and reusable heterogeneous catalyst for the synthesis of polyfunctionalized 4H-pyrans  

作　　者：Javad Safaei-Ghomi Raheleh Teymuri Hossein Shahbazi-Alavi Abolfazl Ziarati 

机构地区：[1]Department of Organic Chemistry,Faculty of Chemistry,University of Kashan

出　　处：《Chinese Chemical Letters》2013年第10期921-925,共5页中国化学快报（英文版）

基　　金：University of Kashan for supporting this work by Grant No.159196/XV

摘　　要：A highly efficient and general method for the synthesis of polyfunctionalized 4H-pyrans is established through a one-pot multicomponent cyclocondensation of aromatic aldehydes with CH acids, malononitrile and ethyl acetoacetate using nano silica supported tin （II） chloride as a catalyst. In this method SnCl2/nano Si02 was used as green and reusable catalyst. Excellent yields, short reaction times, simple workup, and inexpensiveness and commercially availability of the catalyst are the advantages of this method.A highly efficient and general method for the synthesis of polyfunctionalized 4H-pyrans is established through a one-pot multicomponent cyclocondensation of aromatic aldehydes with CH acids, malononitrile and ethyl acetoacetate using nano silica supported tin （II） chloride as a catalyst. In this method SnCl2/nano Si02 was used as green and reusable catalyst. Excellent yields, short reaction times, simple workup, and inexpensiveness and commercially availability of the catalyst are the advantages of this method.

关 键 词：Nano silica supported tin （11） chloride Polyfunctionalized 4H-pyrans Multicomponent reactions Heterogeneous catalyst 

分 类 号：O643.32[理学—物理化学]