Facile Synthesis of Propranolol and Novel Derivatives

Abstract EN

Propranolol is one of the first medications of the beta-blocker used for antihypertensive drugs.

This study reports the facile route for the synthesis of propranolol and its novel derivatives.

Herein, propranolol synthesis proceeded from 1-naphthol and isopropylamine under mild and less toxic conditions.

Novel propranolol derivatives were designed by reactions of propranolol with benzoyl chloride, pyridinium chlorochromate, and n-butyl bromide through esterification, oxidation reduction, and alkylation, respectively.

The isolation and purity of compounds were conducted using column chromatography and thin-layer chromatography.

Mass spectrometry and 1H-NMR spectroscopy were applied to identify new compounds structure.

Propranolol derivatives from 2-chlorobenzoyl chloride (compound 3), 2-fluorobenzoyl chloride (compound 5), and especially acetic anhydride (compound 6) manifested high yields and significantly increased water solubility.

Six semisynthetic propranolol derivatives promise to improve antioxidative and biological activities.