Imperial Chemical Industries Limited

Ici Pharma

Christian R Delvare

Pierre A Bruneau

Keith H Gibson

Frank Carey

Rodger M McMillan

The invention concerns pharmaceutical compositions containing a 1,2-dihydro-3H-indazol-3-one derivative of the formula I ##STR1## wherein Ra is hydrogen, halogeno, nitro, hydroxy, (2-6C)alkanoyloxy, (1-6C)alkyl, (1-6C)alkoxy, fluoro-(1-4C)alkyl, (2-6C)alkanoyl, amino, (1-6C)alkylamino, di-[(1-4C)alkyl]amino, (2-6C)alkanoylamino or hydroxy-(1-6C)alkyl; Rb is hydrogen, halogeno, (1-6C)alkyl or (1-6C)alkoxy; and Y is a group of the formula --A.sup.1 --X--A.sup.2 --Q in which A.sup.1 is (1-6C)alkylene, (3-6C)alkenylene, (3-6C)alkynylene or cyclo(3-6C)alkylene, or A.sup.1 is phenylene; X is oxy, thio, sulphinyl, sulphonyl, imino, (1-6C)alkylimino, (1-6C)alkanoylimino, iminocarbonyl or phenylene, or X is a direct link to A.sup.2 ; A.sup.2 is (1-6C)alkylene, (3-6C)alkenylene or (3-6C)alkynylene or A.sup.2 is cyclo(3-6C)alkylene or is a direct link to Q, or the group --A.sup.1 --X--A.sup.2 -- is a direct link to Q; or Y is (2-10)alkyl, (3-10C)alkenyl or (3-6C)alkynyl; and Q is aryl or heteroaryl. The invention also provides novel 1,2-dihydro-3H-indazol-3-ones, processes for their production and the use of 1,2-dihydro-3H-indazol-3-ones for the manufacture of medicaments for the treatment of various allergic and inflammatory diseases.

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Reims, France

Christian R Delvare