A new method for bromination of carbazoles, β-carbolines and iminodibenzyls by use of N-bromosuccinimide and silica gel
作者:Keith Smith、D.Martin James、Anil G. Mistry、Martin R. Bye、D.John Faulkner
DOI:10.1016/s0040-4020(01)90362-x
日期:1992.9
in high yields at ambient temperature in dichloromethane by use of the appropriate quantity of N-bromosuccinimide in the presence of silica gel. By contrast, the brominations of the β-carbolines, harmane and norharman, are less selective and give mixtures of products, some of which have unusual substitution patterns.
咔唑,N-乙基咔唑,亚氨基二苄基(10,11-二氢-5H-二苯并[b,f] a庚因),N-乙基亚氨基二苄基和丙咪嗪在环境温度下很容易在二氯甲烷中以高收率单溴,二溴或多溴化在硅胶存在下适量的N-溴琥珀酰亚胺。相比之下,β-咔啉,harmane和Norharman的溴化选择性较低,并产生产物混合物,其中一些具有不同寻常的取代模式。