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。