[CH3:1][N:2]1[CH:6]=[C:5]([C:7]2[N:12]=[N:11][C:10]([NH2:13])=[CH:9][CH:8]=2)[CH:4]=[N:3]1.Cl[CH2:15][CH:16]=O.O.C([O-])(O)=O.[Na+]>CCO>[CH3:1][N:2]1[CH:6]=[C:5]([C:7]2[CH:8]=[CH:9][C:10]3[N:11]([CH:15]=[CH:16][N:13]=3)[N:12]=2)[CH:4]=[N:3]16-(1-Methyl-1H-pyrazol-4-yl)-pyridazin-3-ylamine (Stage 8.3, 2.41 g, 13.8 mmol) was dissolved in EtOH (18 mL). Chloroacetaldehyde 55% in H2O (1.61 mL, 13.8 mmol) and NaHCO3 (2.3 g, 27.5 mmol) were added. The RM was stirred at 80° C. for 5 h. The solvent was removed and a solution of 5% NaHCO3 was added. The mixture was extracted twice with DCM/MeOH (9/1). The combined organic phases were washed with brine, dried over Na2SO4, and the solvent was removed to afford the title compound as a black solid (tR 1.0 min (conditions 2), MH+=200).
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