作者:Alex Sudakow、Peter G. Jones、Thomas Lindel
DOI:10.1002/ejoc.201101711
日期:2012.2
Irradiation of N-benzylated 2-azidobenzimidazoles at 300 nm in the presence of an excess amount of carboxylic acids results in a novel regioselective synthesis of 2-amino-6-oxybenzimidazoles in isolated yields of 60–70 %. It is also possible to regioselectively introduce 6-bromo, 6-chloro, and 6-triflyloxy groups. Irradiation in dichloromethane in the absence of external nucleophiles revealed that
在过量羧酸存在的情况下,在 300 nm 处对 N-苄基化 2-叠氮苯并咪唑进行辐照,可产生 2-氨基-6-氧苯并咪唑的新型区域选择性合成,分离产率为 60-70%。还可以区域选择性地引入 6-溴、6-氯和 6-三氟甲氧基。在没有外部亲核试剂的情况下,在二氯甲烷中的辐照表明,在失去氮后,苯并咪唑基硝基苯可能会进行缩氨酸开环,形成 N-氰基二氮杂-邻二甲苯中间体。