Catalytic carbonylative C-H cyclization of 2-arylphenols can be achieved in the presence of a ruthenium-based catalytic system. The process proceeds efficiently under balloon pressure of CO and produces variously substituted 6H-dibenzo[b,d]pyran-6-one compounds, typically in good to high yields. Functional groups such as the alkoxycarbonyl and acetyl groups as well as halogen atoms (F, Cl, and Br) are well tolerated during the reaction.

This study demonstrates a novel synthetic route to 6H-dibenzo[b,d]pyran-6-ones using ruthenium-catalyzed carbonylative C-H cyclization of 2-arylphenols under balloon pressure, yielding variously substituted compounds in good to high

Paper

Ruthenium-catalyzed carbonylative C-H cyclization of 2-arylphenols: a novel synthetic route to 6H-dibenzo[b,d]pyran-6-ones.

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