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Org Lett. 2018 Mar 2;20(5):1316-1319. doi: 10.1021/acs.orglett.8b00052. Epub 2018 Feb 15.

Vitamin Catalysis: Direct, Photocatalytic Synthesis of Benzocoumarins via (-)-Riboflavin-Mediated Electron Transfer.

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1
Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster , Corrensstraße 40, 48149 Münster, Germany.

Abstract

An operationally simple protocol is disclosed to facilitate entry to benzo-3,4-coumarins directly from biaryl carboxylic acids without the need for substrate prefunctionalization. Complementary to classic lactonization strategies, this disconnection relies on the oxidation competence of photoactivated (-)-riboflavin (vitamin B2) to generate the heterocyclic core via photoinduced single electron transfer. Collectively, the inexpensive nature of the catalyst, ease of execution, and absence of external metal additives are a convincing endorsement for the incorporation of simple vitamins in contemporary catalysis.

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