Synthesis of pyrano[2,3-e?‘?]carbazoles, pyrano[3,2-e?‘?]carbazoles and furo[3,2-e?‘?]carbazole derivatives via iodocyclization

摘要

A simple and facile synthesis of pyranocarbazole derivatives starting from easily accessible e?‘?-propargylated carbazoles using iodocyclization in good yields is reported.