[NH4+].[OH-].C([N:6](C(C)C)CC)(C)C.[Cl:12][C:13]1[N:14]=[N:15][C:16]([Cl:22])=[CH:17][C:18]=1[C:19](Cl)=[O:20]>C1COCC1.CN(C1C=CN=CC=1)C>[Cl:12][C:13]1[N:14]=[N:15][C:16]([Cl:22])=[CH:17][C:18]=1[C:19]([NH2:6])=[O:20]A solution of NH4OH (1.1 mL, 17 mmol, 1.2 equiv) and diisopropylethylamine (6.2 mL, 36 mmol, 2.1 equiv) in THF (57 mL) was sonicated until homogeneous after which was added DMAP (1.0 g, 14 mmol, 1.0 equiv). 3,6-dichloropyridazine-4-carbonyl chloride (3.0 g, 14 mmol, 1.0 equiv) was then added and the solution was stirred at room temperature for 20 minutes. The solution was filtered and partitioned between EtOAc and 1M KHSO4 solution. The organic layer was washed once more with 1M KHSO4 and saturated NaCl, dried over Na2SO4, and evaporated to dryness to give the desired product (2.6 g, 96%).
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