反应详情

To a stirred solution of the [4-amino-2-(2-methylphenyl)benzoyl]methionine methyl ester (85 mg, 0.23 mmol) in CH2Cl2 (5 mL) was added nicotinic acid chloride hydrochloride (81 mg, 0.46 mmol) and saturated NaHCO3 (2 mL). The reaction was stirred at ambient temperature for 2 hours. The reaction was diluted with CH2Cl2 (10 mL), the layers were separated and the organic layer washed with saturated aqueous NaHCO3 (5 mL), dried (MgSO4) and concentrated in vacuo. Flash chromatography (CH2Cl2-methanol 50:1) and crystallization from ethyl acetate gave the desired compound (87 mg, 80%) as a white powder. 1H NMR (300 MHz, CDCl3) δ 9.10 (dd, 1H, J=2.4, 1.0 Hz), 8.80 (dd, 1H, J=4.7, 1.7 Hz), 8.21 (ddd, 1H, J=7.8, 2.4, 1.7 Hz), 8.09-8.00 (m, 2H), 7.71-7.66 (m, 1H), 7.64-7.61 (m, 1H), 7.46 (ddd, 1H, J=7.8, 4.7, 1.0 Hz), 7.35-7.20 (m, 4H), 5.92 (bd, J=7.5 Hz), 4.67-4.57 (m, 1H), 3.66 (s, 3H), 2.23-2.01 (4 s and m, 8H), 2.00 (m, 1H), 1.65-1.52 (m, 1H). MS m/z 478 (M+1)+.

1. customthe layers were separated
2. washthe organic layer washed with saturated aqueous NaHCO3 (5 mL)
3. dry with materialdried (MgSO4)
4. concentrationconcentrated in vacuo
5. customFlash chromatography (CH2Cl2-methanol 50:1) and crystallization from ethyl acetate