反应详情

A solution of ethyl 3-carbamoyl-4-chloropyrrolo[1,2-b]pyridazine-6-carboxylate (1.25 g, 4.67 mmol) (R)-1-(1-methylcyclopropyl)ethanamine (0.697 g, 5.14 mmol) and DIPEA (2.039 mL, 11.67 mmol) in NMP (Volume: 5 mL) was heated to 100° C. for 4 hr. The reaction mixture was added 100 mL of EtOAc which was washed with 50 mL of water, 50 mL of 10% LiCl solution and 50 mL of brine, dried over Na2SO4. Filtration and concentration to yield a crude product which was purified on silica gel column with hexanes/EtOAc(1/1) to yield the desired product (1.246 g, 81% yield). 1H NMR (400 MHz, CD3OD) δ 8.23 (s, 1H), 8.03 (d, J=1.8 Hz, 1H), 7.32 (d, J=1.8 Hz, 1H), 4.38 (d, J=7.0 Hz, 2H), 4.04-3.93 (m, 1H), 1.46-1.36 (m, 6H), 1.27 (s, 3H), 0.65-0.51 (m, 2H), 0.48-0.37 (m, 2H). MS (ES+) m/z: 331.08 (M+H); HPLC: 96%, retention time: 3.260 min (analytical HPLC Method B).

1. washwas washed with 50 mL of water, 50 mL of 10% LiCl solution and 50 mL of brine
2. dry with materialdried over Na2SO4
3. filtrationFiltration and concentration
4. customto yield a crude product which
5. customwas purified on silica gel column with hexanes/EtOAc(1/1)