反应详情

HATU (1-[Bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium 3-oxid hexafluorophosphate) (4.56 g, 12.0 mmol) was added to a solution of 6-acetamido-3-bromopicolinic acid (2.6 g, 10.0 mmol) and DIPEA (N,N-diisopropylethylamine)(5.2 ml, 30 mmol) in DCM (dichloromethane)(10 ml). After 10 minutes, N,O-dimethylhydroxylamine hydrochloride (1.5 g, 15.0 mmol) was added to the reaction. The reaction was stirred at room temperature for 5 min. The reaction mixture was partitioned between EtOAc (ethyl acetate) and saturated NH4Cl solution. The organic phase was washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The crude material was used in the next step without further purification. MS (m/z) 302.1 [M+H]+. 1H NMR (400 MHz, cd3cl) δ 8.14 (s, 1H), 8.13 (d, J=8.4 Hz, 1H), 7.85 (d, J=8.4 Hz, 1H), 3.56 (s, 3H), 3.37 (s, 3H), 2.20 (s, 3H).

1. customThe reaction mixture was partitioned between EtOAc (ethyl acetate) and saturated NH4Cl solution
2. washThe organic phase was washed with brine
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe crude material was used in the next step without further purification