Aluminium Powder-Catalyzed Regio- and Stereoselective Aminobromination of α,β-Unsaturated Carbonyl Compounds and Simple Olefins with the<i>p</i>-Toluenesulfonamide/<i>N</i>-Bromosuccinimide (TsNH<sub>2</sub>-NBS) System
作者:Zhan-Guo Chen、Jun-Fa Wei、Ming-Zhen Wang、Li-Yan Zhou、Cong-Jie Zhang、Xian-Ying Shi
DOI:10.1002/adsc.200900343
日期:2009.10
The regio- and stereoselective aminobromination of α,β-unsaturated carbonyl compounds and simple olefins catalyzed by elementary aluminium powder has been established by using p-toluenesulfonamide (TsNH2) and N-bromosuccinimide (NBS) as the nitrogen/bromine sources. The reaction was convenient to carry out with a loading of 1 mol% catalyst at room temperature without inert gas protection. This method
以对甲苯磺酰胺(TsNH 2)和N-溴代琥珀酰亚胺(NBS)为氮/溴源,建立了由元素铝粉催化的α,β-不饱和羰基化合物和简单烯烃的区域和立体选择性氨基溴化反应。该反应方便地在室温下在没有惰性气体保护的情况下以1mol%的催化剂负载量进行。这种方法提供了一种简单的方法来反式α,β-不饱和羰基化合物和简单烯烃的邻位卤代氨基衍生物,收率高(高达99.8%),并且具有出色的区域选择性和立体选择性。富电子和缺电子的烯烃对氨基溴化反应的活性显示出显着差异,并具有相反的区域选择性。已经提出了两种可能的途径,分别涉及溴或氮杂环丁烷中间体。