Synthesis of imidazo[1,5-a]pyridines from 1,1-dibromo-1-alkenes
作者:Aimin Zhang、Xiaoling Zheng、Junfa Fan、Wang Shen
DOI:10.1016/j.tetlet.2009.12.013
日期:2010.2
An efficient method is developed for the synthesis of imidazo[1,5-a]pyridine from the reaction of 1,1-dibromo-1-alkenes with 2-aminomethylpyridines. The reaction requires an inorganic base, such as Na2CO3, and moderate heating in DMF to proceed. Moderate to good yields are obtained. As demonstrated by the authors and others, 1,1-dibromo-1-alkenes are employed as synthons for activated carboxyl groups
开发了一种由1,1-二溴-1-烯烃与2-氨基甲基吡啶反应合成咪唑并[1,5- a ]吡啶的有效方法。该反应需要无机碱,例如Na 2 CO 3,并在DMF中进行适度加热。获得了中等至良好的产量。正如作者和其他人所证明的,1,1-二溴-1-烯烃被用作活化羧基的合成子。
Facile synthesis of benzoxazoles from 1,1-dibromoethenes
Direct coupling of 1,1-dibromoethenes with 2-aminophenols had been achieved to form the corresponding benzoxazoles under mildly basic reaction conditions. A variety of substituted 2-aminophenols provided the desired products in moderate to good yields. Even though 1,1-dibromoethenes have to be derived from arylcarboxaldehydes or glyoxalate for the reactions, this method still provides a new route to the preparation of benzoxazoles, complementing to existing synthetic strategies. (C) 2010 Elsevier Ltd. All rights reserved.