Synthesis & Pharmaceutical Characterization of 1,5-Benzothiazepine Derivatives

Abstract

The 1,5-benzothiazepine core serves as a notable privileged framework in medicinal chemistry, defined by a seven-membered heterocyclic ring that features sulfur and nitrogen atoms combined with a benzene ring. This review offers a comprehensive examination of the synthetic environments related to 1,5-benzothiazepine derivatives, compiling information from an extensive body of pharmaceutical research. The conversation focuses on the condensation of 2-aminothiophenols with $\alpha,\beta$-unsaturated carbonyl compounds (chalcones), contrasting traditional thermal reflux techniques with contemporary green chemistry approaches like microwave-assisted organic synthesis (MAOS), ultrasound-facilitated reactions, and the use of ionic liquids. This manuscript focuses on the thorough assessment of various catalytic systems, such as Lewis acids, metal nanocatalysts, and solid heterogeneous supports, emphasizing reaction kinetics and diastereoselectivity. In addition, the review outlines the pharmacological importance of these derivatives, especially their function as L-type calcium channel blockers (e.g., diltiazem, clentiazem) and CNS-active compounds (e.g., quetiapine, thiazesim). Insights from structural-activity relationship (SAR) are utilized to clarify how modifications at C-2, C-3, and C-5 affect therapeutic results. Main findings emphasize the transition to solvent-free and catalyst-free approaches to improve atom economy and minimize ecological impact. Future projections indicate the incorporation of in silico pharmacokinetic modeling and nano-formulation techniques to enhance the bioavailability of drug candidates based on 1,5-benzothiazepine.

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