反应详情

To a stirred solution of methyl 3-amino-2-hydroxybenzoate (0.576 g, 3.45 mmol) and pyridine (0.546 g, 6.9 mmol) in anhydrous dichloromethane (20 mL) was added drop wise a solution of benzyl 2-(chlorocarbonyl)-2-methylpyrrolidine-1-carboxylate (1.07 g, 3.8 mmol) in anhydrous dichloromethane (5 mL). After the addition, the mixture was stirred at room temperature overnight. Removed the solvents and purified by silica gel chromatography (petroleum ether/ethyl acetate=100:1 to 25:1) to obtain a yellow oil of benzyl 2-(2-hydroxy-3-(methoxycarbonyl)phenylcarbamoyl)-2-methylpyrrolidine-1-carboxylate (1 g, yield 66%). 1H-NMR (400 MHz, DMSO-d6): δ 1.53-1.58 (m, 3H), 1.88-1.91 (m, 3H), 1.28 (brs, 1H), 3.53-3.65 (m, 2H), 3.92 (s, 3H), 5.02-5.15 (m, 2H), 6.92-6.96 (m, 1H), 7.16-7.34 (m, 5H), 7.55-7.57 (d, J=7.8 Hz, 1H), 7.88-8.12 (m, 1H), 8.72-8.89 (d, 1H), 10.82 (s, 1H); LC-MS (ESI) m/z: 413 (M+1)+.

1. additionAfter the addition
2. customRemoved the solvents
3. custompurified by silica gel chromatography (petroleum ether/ethyl acetate=100:1 to 25:1)