6H-Indolo[2,3-b]Quinoline: A Recent Synthetic Comprehension

The present review provides a comprehensive overview of the synthetic methods developed recently for 6H-Indolo[2,3-b]quinoline. The review is classified into the following: 1) inheriting indole skeleton and constructing quinoline ring; 2) inheriting quinoline skeleton and constructing indole ring, and 3) convergent strategies constructing both rings simultaneously or step by step. This review discusses the scope of multifunctional reactivity of indole and quinoline skeleton for constructing the desired indoloquinolines as explored in various research strategies.