Selenium-assisted carbonylation of o-hydroxyacetophenone (1) with carbon monoxide in the presence of a strongly basic tertiary amine gave 4-hydroxycoumarin (2) as a C-carbonylated product in a high yield.
A. Ogawa, K. Kondo, S. Murai and N. Sonoda, J. Chem. Soc., Chem. Commun., 1982, 1283 DOI: 10.1039/C39820001283
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