PROCESS FOR PREPARING PYRIDAZINONE COMPOUNDS

摘要

The present invention provides a process for the preparation 6-[3- (hetero)aryloxy-2-~fluoro-benzyl] -2H-pyridazin-3-one compounds of formula VIII wherein R2 is an optionally substituted aryl or an optionally substitut ed heteroaryl, X is C1-6 alkyl, halogen, or a function group readily derived therefrom and R5 is H, C02R5a or formula C; R5a is hydrogen or C1-6 alkyl; R 4c is hydrogen or C1-6 alkyl.