6-methyl-7-(4-(methylsulfonyl)piperazine-1-carbonyl)pyrrolo[1,2-b]pyridazine-5-carboxylic acid 、
3-(氨基甲基)-4,6-二甲基-1,2-二氢吡啶-2-酮 以to produce Compound 126的产率得到N-((4,6-dimethyl-2-oxo-1,2-dihydropyridin-3-yl)methyl)-6-methyl-7-(4-(methylsulfonyl)piperazine-1-carbonyl)pyrrolo[1,2-b]pyridazine-5-carboxamide