反应详情

To a solution of 2-chloropyrimidine-4-carboxylic acid (3.95 g, 24.9 mmol) and N-methoxymethanamine hydrogen chloride salt (2.43 g, 24.9 mmol) in dichloromethane (15 mL) were added triethylamine (6.95 mL, 50 mmol) and (benzotriazol-1-yloxy)tripyrrolidino-phosphonium hexafluorophosphate (13 g, 24.91 mmol) and stirred for 4 hr. The solution was diluted with EtOAc, washed with brine, dried with MgSO4, filtered, and concentrated to dryness. Purification on silica gel by flash chromatography (0-100% EtOAc/hexanes) afforded 2-chloro-N-methoxy-N-methylpyrimidine-4-carboxamide (3.30 g, 16.37 mmol, 66% yield). MS ESI: [M+H]+ m/z 202.0. 1H NMR (500 MHz, CDCl3) δ 8.75 (d, J=4.6, 1H), 7.48 (d, J=4.6, 1H), 3.77 (s, 3H), 3.35 (s, 3H).

1. washwashed with brine
2. dry with materialdried with MgSO4
3. filtrationfiltered
4. concentrationconcentrated to dryness
5. customPurification on silica gel by flash chromatography (0-100% EtOAc/hexanes)