(R)-4-(2-methylpiperazin-1-yl)-1-phenylpyrido[3,4-d]pyridazine 、
三乙胺 、
1-哌啶酰氯 以afforded (R)-(3-methyl-4-(1-phenylpyrido[4,3-d]pyridazin-4-yl)piperazin-1-yl)(piperidin-1-yl)methanone 38的产率得到(R)-(3-methyl-4-(1-phenylpyrido[4,3-d]pyridazin-4-yl)piperazin-1-yl)(piperidin-1-yl)methanone