[Br:1][C:2]1[CH:3]=[C:4]2[C:9](Cl)=[C:8]([C:11]([NH2:13])=[O:12])[CH:7]=[N:6][N:5]2[CH:14]=1.Cl.[CH:16]1([C@H:19]([NH2:21])[CH3:20])[CH2:18][CH2:17]1.CCN(C(C)C)C(C)C.O>CN1C(=O)CCC1>[Br:1][C:2]1[CH:3]=[C:4]2[C:9]([NH:21][C@@H:19]([CH:16]3[CH2:18][CH2:17]3)[CH3:20])=[C:8]([C:11]([NH2:13])=[O:12])[CH:7]=[N:6][N:5]2[CH:14]=1A solution of 6-bromo-4-chloropyrrolo[1,2-b]pyridazine-3-carboxamide (Preparation 5, 500 mg, 1.821 mmol), (R)-1-cyclopropylethanamine HCl salt (277 mg, 2.277 mmol) and DIPEA (0.795 mL, 4.55 mmol) in NMP (5 mL) was heated to 100° C. for 4 hr. The reaction mixture was added 10 mL of water and stirred for 10 minutes. The solid was collected by vacuum filtration and dried to afford the title compound (485.4 mg, 79%). HPLC (condition G): retention time=2.29 min. LCMS (condition B): m/z 324.1. 1H NMR (400 MHz, DMSO-d6) δ ppm 10.70 (1 H, d, J=8.1 Hz), 8.22 (1 H, s), 7.84 (1 H, d, J=1.8 Hz), 6.99 (1 H, d, J=1.8 Hz), 3.78-3.91 (1H, m), 1.29 (3 H, d, J=6.2 Hz), 0.99-1.11 (1 H, m), 0.42-0.53 (2 H, m), 0.33-0.40 (1H, m), 0.22-0.29 (1 H, m).
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