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Twice As Nice: The Duff Formylation of Umbelliferone Revised

Overview
Journal Molecules
Publisher MDPI
Specialty Biology
Date 2021 Dec 24
PMID 34946562
Authors
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Abstract

More efficient and preferably more convenient and greener synthetic solutions in coumarin scaffold functionalization are in steady demand. The Duff -formylation of unsubstituted umbelliferone was revised in this study. The reaction conditions were optimized based upon data from the literature analysis and resulted in unexpectedly rapid -formylation of umbelliferone, yielding a mixture of -formyl position isomers. Thorough studies on the separation of -formylated umbelliferones using chromatographic and recrystallization methods as well as the evaluation of their solubility in common organic solvents led to complete resolution of 8-formyl- and 6-formylumbelliferones. The precise protocol for simultaneous preparation, extraction, and purification of 8-formyl- and 6-formylumbelliferones is provided, and the prospective studies of biological and pharmacological activities of these compounds are synopsized.

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