Process for the preparation of 5,6,7a tetrahydro-4h -thieno...

Details Process for the preparation of 5,6,7a tetrahydro-4h -thieno... Process for the preparation of 5,6,7a tetrahydro-4h -thieno...

C - Chemistry, Metallurgy

07

D

260/276.1

C07D 495/04 (2006.01) C07D 211/74 (2006.01)

Patent

CA 1182116

IN THE UNITED STATES PATENT AND TRADEMARK OFFICE PATENT APPLICATION INVENTION: PROCESS FOR THE PREPARATION OF 5,6,7,7a-TETRAHYDRO- 4H-THIENO-[3,2,-c]PYRIDIN-2-ONE. INVENTORS: JEAN-PIERRE MAFFRAND; NORIO SUZUKI; KYNICHI MATSUBAYACHI; SHINICHIRO ASHIDA. ABSTRACT OF THE DISCLOSURE The present invention provides a process for the preparation of 5,6,7,7a-tetrahydro-4H-pyridin-2-one derivatives of the general formula:- Image (I) in which R is a hydrogen atom or a phenyl radical optionally substituted by at least one halogen atom, lower alkyl radical, lower alkoxy radical, nitro group, carboxy group, alkoxycarbonyl radical or cyano group, R' is a hydrogen atom or a lower alkyl radical and n is 0, 1, 2, 3 ox 4; and of their addition salts with mineral or organic acids, wherein a compound of the general formula:- Image (II) in which R, R' and n have the same meanings as above and R' is a hydrogen atom or an alkyl radical contain- -1- ABSTRACT OF THE DISCLOSURE ( Continued) ing up to 4 carbon atoms, is treated in an organic solvent with gaseous hydrogen chloride and gaseous hydrogen sulphide. -2-

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