7-carboxy-flavone derivatives preparation method and...

Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

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Reexamination Certificate

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06965039

ABSTRACT:
The invention concerns novel flavone and isoflavone derivatives of formulae (Ia) and (Ib) wherein: X represents a group of formula —COOR, or —PO(OR)2; R represents a hydrogen atom or an alkaline or alkaline-earth metal, or a lower alkyl group; R1represents a hydroxy group, a lower alkoxy group or an acyloxy group; R2and R3, identical or different, represent a hydrogen or halogen atom, or a trifluoromethyl group, a trichloromethyl group, a hydroxy group, an alkoxy group or an acyloxy group comprising 1 to 5 carbon atoms, or R2and R3can combine to form an alkylene dioxy group. The invention is useful for rheumatic diseases.

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