Condensed pyridazine derivatives, their production and use

Abstract From the Canadian patent

Compounds represented by general formula (I) salts of the same, or prodrugs , of both which exhibit excellent, antiallergic, antihistaminic anti-, inflammatory and eosinotaxis-inhibitory effects and so on, and are therefore , useful as preventive and therapeutic agents for allergic dermatosis wherein Ar1 and Ar2 are each an optionally substituted aromatic group or , alternatively Ar1 and Ar2 together with the carbon atom adjacent to them may form a fused ring; B is a piperidine ring a piperazine ring, or the like; X , and Y are each oxygen a divalent linear lower hydrocarbon group which may be interrupted by one to three heteroatoms or the like; A is nitrogen or CR7 , (wherein R7 is …