Patent ID: 8871956

Claim:
A method for preparing 3-keto-benzofuran derivatives of general formula: in which R represents an alkyl or aryl group, R 1 represents hydrogen or an alkyl or aryl group and R 2 represents an alkyl or phenyl group of general formula: in which Y represents hydrogen, a halogen or a hydroxyl, alkoxy or dialkylaminoalkoxy group, where a benzofuran derivative of general formula: in which R 1 and R 2 have the same meanings as above and X represents chlorine, bromine or iodine or a sulfonate group of general formula: R 3 —SO 2 —O— IV in which R 3 represents a trifluoromethane or imidazolyl group; is coupled with a sulfonamide derivative of general formula: R—SO 2 —NH 2 V in which R has the same meaning as above, in the presence of a basic agent and a catalytic system formed of a complex between a palladium compound and a ligand.