Synthesis and Pharmacological Evaluation of Noscapine-Inspired 5-Substituted Tetrahydroisoquinolines as Cytotoxic Agents

Journal of Medicinal Chemistry
Shane M DevinePeter J Scammells

Abstract

A series of 5-substituted tetrahydroisoquinolines was synthesized via a 10-step linear synthesis to assess whether replacement of noscapine's southern isobenzofuranone with other moieties resulted in retained cytotoxic activity. One such molecule, 18g, bearing a para-methoxybenzyl functionality with N-ethylcarbamoyl substitution, produced cell-cycle arrest at the G2/M phase with an EC50 of 2.7 μM in the MCF-7 breast-cancer cell line, a 7-fold increase compared with that of noscapine (5). This molecule had similar activity (EC50 of 2.5 μM) against the resistant NCI/AdrRES cell line, demonstrating its potential to overcome or avert known resistance mechanisms, unlike current cytotoxic agents. Compound 18g was found to modify the drug-efflux activity of P-gp and, in combination studies, potentiate the antiproliferative activity of vinblastine. These results provide insights into structural modifications to noscapine that will guide future development toward more potent cytotoxic agents that are active against resistant cancer cells.

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Citations

Nov 20, 2020·ChemMedChem·Lea WinandMarkus Nett
Nov 26, 2019·ACS Omega·Praveen Kumar Reddy NagireddySrinivas Kantevari
Dec 21, 2021·Frontiers in Pharmacology·Rajeev K SinglaBairong Shen

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