| abstract |
Process for the preparation of a compound of formula with acylation of a benzothiophene of the formula in which R 4 represents C 1 -C 4 alkoxy, and R 5 represents C 1 -C 4 alkyl, with an acylating agent of the formula in which R 6 represents chlorine, bromine or hydroxy, in the presence of a solvent and boron trichloride and Dealkylation with boron trichloride without intermediate isolation. |