Synthesis and Biological Evaluation of Tryptanthrin Derivatives

Tryptanthrin, an indolo[2,1-b]quinazolin-6,12-dione alkaloid, has attracted considerable attention as a scaffold for therapeutic development. Contemporary synthetic strategies encompass multi-step condensations of isatoic anhydride with substituted anthranilic acids, catalytic oxidations and microwave-assisted one-pot protocols, as well as the use of designer ionic liquids to promote sustainable, high-yielding processes. Derivatisation has yielded spiro-fused ring systems, halogenated analogues and side chains bearing carboxylate or dicarboxylate residues, enriching structural diversity. Biological evaluation spans in vitro assays of cytotoxicity against diverse cancer cell lines, anti-angiogenic and anti-inflammatory screens, transporter interaction studies and in silico ADME profiling. Mechanistic investigations have revealed modulation of VEGFR2-mediated ERK1/2 signal transduction, STAT3 inhibition, induction of mitochondrial apoptosis and potential inhibition of efflux pumps such as P-glycoprotein. Collectively, these endeavours underscore the promise of tryptanthrin derivatives as multifunctional lead compounds with global relevance to oncology, infectious disease and inflammatory disorders.

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Synthesis and Biological Evaluation of Tryptanthrin Derivatives publication trend

The graph below shows the total number of articles in synthesis and biological evaluation of tryptanthrin derivatives across all publications each year (not limited to Nature Index journals).

Technical terms

Alkaloid: A naturally occurring organic compound containing basic nitrogen atoms, often with significant biological activity.

Angiogenesis: The physiological process of new blood vessel formation from pre-existing vasculature, critical in both normal development and disease.

Apoptosis: Programmed cell death characterized by cell shrinkage, chromatin condensation and caspase activation.

ADME: Acronym for Absorption, Distribution, Metabolism and Excretion; key pharmacokinetic parameters predicting drug behaviour.

Spiro-fused: A structural motif in which two rings are joined through a single shared atom, conferring three-dimensional rigidity.

References

1. Tryptanthrin Inhibits Angiogenesis by Targeting the VEGFR2-Mediated ERK1/2 Signalling Pathway. PLOS ONE (2013).
2. The Synthetic Tryptanthrin Analogue Suppresses STAT3 Signaling and Induces Caspase Dependent Apoptosis via ERK Up Regulation in Human Leukemia HL-60 Cells. PLOS ONE (2014).
3. Transport characteristics of tryptanthrin and its inhibitory effect on P-gp and MRP2 in Caco-2 cells.. Journal of Pharmacy & Pharmaceutical Sciences (2011).
4. Microwave-assisted one-pot synthesis of some dicyano- methylene derivatives of indenoquinoxaline and tryptanthrin under solvent free conditions. Arkivoc (2007).
5. The chemistry of tryptanthrin and its derivatives. Arkivoc (2012).
6. Exploiting 1,2,3-Triazolium Ionic Liquids for Synthesis of Tryptanthrin and Chemoselective Extraction of Copper(II) Ions and Histidine-Containing Peptides. Molecules (2016).
7. Identification of Spiro-Fused Pyrrolo[3,4-a]pyrrolizines and Tryptanthrines as Potential Antitumor Agents: Synthesis and In Vitro Evaluation. International Journal of Molecular Sciences (2021).
8. Ethyl 5-Oxo-5-(((12-oxoindolo[2,1-b]quinazolin-6(12H)-ylidene)amino)oxy)pentanoate. Molbank (2022).