Diverse Routes for the Synthesis of Indole-Fused Complex Architecture from Simple Molecules

Abstract

: Several easy, efficient and convenient procedures to access indoles fused heterocyclic systems are described in this review. These heterocyclic systems were synthesized from several cyclic or acyclic molecules via a variety of reactions such as Diels-Alder reaction, Michael addition, Morita-Baylis-Hillmann reaction and many other domino/Cascade approaches with high selectivity. Most of the given protocols in this review proceed though organocatalytic pathways, however some underwent via different catalytic and non-catalytic reactions.