C(O[C:6](=O)[NH:7][C@H:8]1[CH2:12][CH2:11][N:10]([C:13]2[CH:14]=[CH:15][C:16]3[N:17]([C:19]([Br:22])=[CH:20][N:21]=3)[N:18]=2)[CH2:9]1)(C)(C)C.IC.[H-].[Na+]>CN(C=O)C>[Br:22][C:19]1[N:17]2[N:18]=[C:13]([N:10]3[CH2:11][CH2:12][C@H:8]([NH:7][CH3:6])[CH2:9]3)[CH:14]=[CH:15][C:16]2=[N:21][CH:20]=1[(S)-1-(3-Bromo-imidazo[1,2-b]pyridazin-6-yl)-pyrrolidin-3-yl]-carbamic acid tert-butyl ester (1.2 g, 3.1 mmol) taken up in 15 mL DMF and cooled to 0° C. in an ice bath. Iodomethane (342 uL, 5.42 mmol) added and stirred 5 minutes. Then sodium hydride 60% in oil (251 mg, 6.2 mmol) was slowly added. Reaction stirred 5 minutes at 0° C. then removed from ice bath and stirred 30 minutes at room temperature. Reaction was quenched with ice then extracted with ethyl acetate 2×. Ethyl acetate fractions combined dried over magnesium sulfate filtered reduce in vacuo. This was then taken up in 26 mL DCM and 4 mL TFA added. Stirred 1 hour until complete by LC/MS. Reaction washed with 1N NaOH, DCM layer removed dried over magnesium sulfate filtered, reduced in vacuo to get 951 mg crude product carried on as is to part B. LRMS (ESI) m/z 296/298 [(M+H)]+, calc'd for C11H14BrN5: 296.17.
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