Direct sequential C-O and C-C formation via double sp2 C-H bond activations to construct 6H-benzo[c]chromen-6-ones
A new method for the direct ortho acyloxylation of sp2 C-H bond with various carboxylic acids was developed. A novel strategy to synthesize 6H-benzo[c]chromen-6-one derivatives was designed via Pd-catalyzed double activations of adjacent spsup