A simple method for the preparation of imidazo[4,5-b]indole-2-thiones from 2-alkynylnitrobenzenes and thioureas is described. In the reaction, a Wittig-like process was triggered by PPh3 and followed by a cyclization step. The products were afforded in yields of 70–98% under mild conditions. Additionally, the 2-alkynylnitrobenzenes were stable and could be prepared via a simple coupling step.
描述了一种从 2-炔基
硝基苯和
硫脲制备
咪唑并 [4,5- b ]
吲哚-2-
硫酮的简单方法。在该反应中,类似 Wittig 的过程由 PPh 3触发,然后是环化步骤。在温和条件下,产品的收率为 70-98%。此外,2-炔基
硝基苯是稳定的,可以通过简单的偶联步骤制备。