Yb(OTf)₃-Catalyzed Synthesis of Thiochromeno[2,3-b]chromenes and Their Antiproliferative Study

 

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Abstract

The synthesis of hitherto unreported thiochromeno[2,3-b]chromenes from 4-hydroxy-2H-chromene-2-thiones was investigated with salicylaldehydes and cyclohexane-1,3-diones in the presence of 10 mol% Yb(OTf)₃ in toluene. The three-component reaction proceeds via Knoevenagel condensation between the cyclohexane-1,3-dione and the salicylaldehyde followed by Michael addition with the 4-hydroxy-2H-chromene-2-thione. The products were obtained in good to excellent yields, with retention of the sulfur atom in the heterocycle. This synthetic approach offers a straightforward and reliable method for preparing sulfur-containing heterocycles, potentially expanding the scope of thiochromene chemistry. A molecular docking study was performed on the synthesized derivatives, and two compounds demonstrated a dose-dependent antiproliferative effect and enhanced ROS generation in the MDA-MB-468 triple-negative breast cancer cell line.

Publication History

Received: 13 January 2025

Accepted: 14 May 2025

Accepted Manuscript online:
14 May 2025

Article published online:
12 June 2025

© 2025. Thieme. All rights reserved

Georg Thieme Verlag KG
Oswald-Hesse-Straße 50, 70469 Stuttgart, Germany

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