Water → Benzyl 4-((6-bromo-3-carbamoylpyrrolo[1,2-b]pyridazin-4-yl)amino)-3,3-dimethylpyrrolidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A solution of 6-bromo-4-chloropyrrolo[1,2-b]pyridazine-3-carboxamide (Intermediate 2, 63.0 mg, 0.230 mmol) in N,N-dimethylformamide (0.5 mL), was added benzyl 4-amino-3,3-dimethylpyrrolidine-1-carboxylate (Intermediate 11, 57 mg, 0.230 mmol) and N,N-diiospropylethylamine (0.121 mL), and heated at 90° C. for 16 h. The reaction was added water, stirred at rt for a 3 hours and filtered. The solid was rinsed with water and dried under vacuum to give benzyl 4-((6-bromo-3-carbamoylpyrrolo[1,2-b]pyridazin-4-yl)amino)-3,3-dimethylpyrrolidine-1-carboxylate (72 mg, 64.5% yield) as a yellow solid. 1H NMR (400 MHz, METHANOL-d4) δ 10.83-10.77 (m, 1H), 8.16 (s, 1H), 7.67 (s, 1H), 7.41-7.27 (m, 7H), 7.09-7.04 (m, 1H), 5.18-5.08 (m, 2H), 4.56-4.45 (m, 1H), 4.16-3.95 (m, 1H), 3.42 (d, J=2.2 Hz, 3H), 1.20 (d, J=13.9 Hz, 6H); MS (ES+) m/z: 486.4, 487.9 (M+H); LC retention time: 4.02 min (analytical HPLC Method I).

Provenance & Evidence