Synthesis of indoles and carbazoles: Diels–Alder reactions of nitrovinyl-pyrroles and -benzindoles

Abstract

Diels–Alder reaction conditions have been employed to prepare indoles, benz[e]indoles, benzo[a]carbazoles, naphth[e]indoles, dibenzo[a,i]carbazoles, dibenzo[a,g]carbazoles, benzo[a]naphtho[i]carbazoles, and benzo[a]naphtho[g]carbazoles from nitrovinylpyrroles and nitrovinylbenzindoles with various dienophiles.