BF3·OEt2-mediated one pot synthesis of 10-indolyldibenzo[b,f]azepine derivatives via tandem ring expansion and C-C bond formation

A simple and efficient one pot protocol was developed for the synthesis of new structurally diverse 10-indolyldibenzo[b,f]azepine derivatives. The reaction involves Lewis-acid mediated ring expansion followed by C–C bond formation through nucleophilic addition of indole moiety.