反应详情

温度

0 °C

3-Amino-6-(4-isopropylsulfonylphenyl)pyrazine-2-carboxylic acid (10 g, 31.12 mmol) was dissolved in THF (80 mL) and cooled to 0° C. N-methoxymethanamine hydrochloride (3.642 g, 37.34 mmol), 1-hydroxybenzotriazole hydrate (5.242 g, 34.23 mmol), DIPEA (8.044 g, 10.84 mL, 62.24 mmol) and 3-(ethyliminomethyleneamino)-N,N-dimethyl-propan-1-amine (5.314 g, 34.23 mmol) was added and the reaction mixture allowed to warm to ambient temperature over 15 hours. The reaction mixture was concentrated in vacuo and the residue dissolved in EtOAc. The organic layer was washed water (×2), saturated aqueous NaHCO3 (×2) and brine (×1). The organic layer was dried (MgSO4), filtered and concentrated in vacuo and the residue purified by column chromatography (eluting with 30% EtOAc/petroleum ether) to give the sub-title compound as an off-white solid (8.8 g, 78% Yield). 1H NMR (400.0 MHz, DMSO) δ 1.18 (d, 6H), 3.42 (s, 3H), 3.44 (sept, 1H), 3.67 (s, 3H), 6.95 (br s, 2H), 7.90 (d, 2H), 8.22 (d, 2H) and 8.82 (s, 1H) ppm; (ES+) 366.1.

1. temperatureto warm to ambient temperature over 15 hours
2. concentrationThe reaction mixture was concentrated in vacuo
3. dissolutionthe residue dissolved in EtOAc
4. washThe organic layer was washed water (×2), saturated aqueous NaHCO3 (×2) and brine (×1)
5. dry with materialThe organic layer was dried (MgSO4)
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customthe residue purified by column chromatography (eluting with 30% EtOAc/petroleum ether)