A one-pot, two-step strategy has been developed for the synthesis of dibenzopyranones via aryl C–H lactonization of 2-arylphenols with CO2. This method combines BBr3-mediated C–H borylation with ZnEt2-promoted C–B bond carboxylation, enabling the efficient construction of lactone frameworks. The reaction exhibits excellent functional group tolerance and is amenable to gram-scale synthesis, providing a range of dibenzopyranone derivatives in moderate to high yields.
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Zhang et al. (2026) studied this question.
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