反应详情

A 2.25 L plastic coated Parr bottle was charged with 3-tert-butyl-4-chloro-N-(6-(2-chlorophenyl)-2-methoxy-3-nitropyridin-4-yl)-1-methyl-1H-pyrazole-5-carboxamide (55.30 g, 0.115 mol) and ethyl acetate (0.55 L). To the resulting slurry was added a slurry of 5% Pt(Sulfided)/C (2.80 g) in ethyl acetate (˜20 mL). The resulting mixture was agitated under 35-40 psi hydrogen gas, recharging with hydrogen gas as needed. After 3 h, hydrogen uptake ceased. The resulting mixture was filtered through CELITE to remove catalyst and the filter cake washed with ethyl acetate. The filtrate was concentrated to yield N-(3-amino-6-(2-chlorophenyl)-2-methoxypyridin-4-yl)-3-tert-butyl-4-chloro-1-methyl-1H-pyrazole-5-carboxamide as a off-white solid. 1H NMR (400 MHz, CHLOROFORM-d) δ 1.42 (s, 9H), 3.98 (br. s., 2H), 4.06 (s, 3H), 4.15 (s, 3H), 7.27-7.35 (m, 2H), 7.44 (dd, J=7.83, 1.22 Hz, 1H), 7.55 (s, 1H), 7.63 (dd, J=7.58, 1.71 Hz, 1H), 8.54 (br. s., 1H)

1. filtrationThe resulting mixture was filtered through CELITE
2. customto remove catalyst
3. washthe filter cake washed with ethyl acetate
4. concentrationThe filtrate was concentrated