Indolo[3,2-b]quinolines: synthesis, biological evaluation and structure activity-relationships.
The tetracyclic indolo[3,2-b]quinoline ring system constitutes an important structural moiety in natural products exhibiting numerous biological activities. In particular, indolo [3, 2-b]quinoline, commonly known as linear quindoline is of particular interest, because of its rigid structure and scope of derivatization. Although the core linear quindoline skeleton shows little or no activity in several biological systems, introduction of a methyl group on the N-5 atom leading to cryptolepine induces remarkable activity against a broad spectrum of biological targets. A number of analogs of quindoline and cryptolepine have been synthesized, incorporating various functional groups on the core quindoline skeleton leading to improved biological activities. In this review, we describe various synthetic methodologies leading to the quindoline scaffold, the biological activities and the structure activity relationships (SAR) of quindoline derivatives toward different disease states to give a better picture of the importance of this moiety in medicinal chemistry.
Kumar
Eyunni V K Suresh
EV
Division of Basic Pharmaceutical Sciences, College of Pharmacy & Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32309, USA.
Etukala
Jagan R
JR
Ablordeppey
Seth Y
SY
D000470:Alkaloids / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000818:Animals; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000935:Antifungal Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000981:Antiprotozoal Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D006801:Humans; D007004:Hypoglycemic Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D007211:Indoles / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D011804:Quinolines / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D013329:Structure-Activity Relationship; D014665:Vasodilator Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology
D000470:Alkaloids; D000900:Anti-Bacterial Agents; D000935:Antifungal Agents; D000970:Antineoplastic Agents; D000981:Antiprotozoal Agents; D007004:Hypoglycemic Agents; D007211:Indoles; D011804:Quinolines; D014665:Vasodilator Agents; C016712:quindoline