Trimethylsilyl iodide → 6-bromo-4-(((3S,4S)-4-methylpyrrolidin-3-yl)amino)pyrrolo[1,2-b]pyridazine-3-carboxamide

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Reaction Steps

Iodotrimethylsilane (6.23 mL, 45.8 mmol) was added dropwise to a suspension of (3S,4S)-benzyl 3-((6-bromo-3-carbamoylpyrrolo[1,2-b]pyridazin-4-yl)amino)-4-methylpyrrolidine-1-carboxylate (8.65 g, 18.31 mmol, prepared by coupling Intermediate 2 and enantiopure Intermediate 5 as previously described in Example 52) in acetonitrile (60 mL). The resulting mixture turned to a homogeneous solution several minutes after completion of addition and gradually turned to brown suspension. After 2 h at room temperature, the resulting mixture was quenched with methanol (10 mL), stirred for 5 min and concentrated in vacuo. The solid residue was diluted with ether (80 mL) and dichloromethane (80 mL), stirred for 30 min and filtered. The filter cake was washed with ether-dichloromethane (1:1 mixture, 160 mL), and dried under vacuum to give the desired 6-bromo-4-(((3S,4S)-4-methylpyrrolidin-3-yl)amino)pyrrolo[1,2-b]pyridazine-3-carboxamide as yellow powder, assumed as HI salt (10.64 g). 1H NMR (400 MHz, methanol-d4) δ ppm 8.20 (s, 1H), 7.73 (d, J=1.8 Hz, 1H), 7.03 (d, J=1.8 Hz, 1H), 5.03-4.92 (m, 1H), 3.83-3.72 (m, 1H), 3.67 (dd, J=12.0, 7.8 Hz, 1H), 3.49-3.40 (m, J=2.4 Hz, 1H), 3.14 (t, J=11.3 Hz, 1H), 2.85-2.71 (m, J=7.3 Hz, 1H), 1.25 (d, J=7.0 Hz, 3H); MS (ES+) m/z: 338.0 (M+H); LC retention time: 2.485 min (analytical HPLC Method H).

Provenance & Evidence