Synthesis of xanthones through the palladium-catalyzed carbonylation/C–H activation sequence

Pd/Cu Cocatalyzed Oxidative Tandem C-H Aminocarbonylation and Dehydrogenation of Tryptamines: Synthesis of Carbolinones

The Pd/Cu cocatalyzed oxidative tandem C-H aminocarbonylation and dehydrogenation was developed, affording carbolinones with molecular oxygen as the terminal oxidant. Natural product strychnocarpine and its derivatives were prepared conveniently using this strategy.

Syntheses of Benzo[c]Chromen-6-ones by Palladium Catalyzed C–H Bond Activation using Diazonium Salts

An efficient palladium catalyzed C-H bond activation for the synthesis of benzo[ c]chromen-6-ones using diazonium salts is described. In the presence of Pd(OAc)2, dppp, PivOH and K2CO3, the diazonium salt can be transformed into the product through a denitrogenation/C-H bond activation/cyclization sequence in acetonitrile. Altogether, nine structurally diverse substituted benzo[ c]chromen-6-ones were prepared in excellent yields through two different methods.

Total synthesis of Sparstolonin B, a potent anti-inflammatory agent

Two concise routes for the first total synthesis of Sparstolonin B have been described.