:
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.
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