The 3-bromoindoles were found to react with pyrroles and indoles, in the presence of protic or Lewis acids, to give 2- (2-indolyl)pyrroles, 2,3'-bi-indolyls, and trimeric products such as 2- (3-indolyl) -3- (2-indolyl)indoles. ... Convenient syntheses of dimeric indoles have been recently ... Recently we reported a high yield selective synthesis of the ... 3-bromoindoles5 that we now prove to be convenient reagents ... Table 1. Synthesis of 2,3'-bi-indolyls, 2-(2-indolyl) ...
