反应详情

To a stirred solution of {1-[6-(3-cyano-5-methyl-benzoyl)-5-isopropyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-ylmethyl]-cyclopropyl}-acetic acid methyl ester (170 mg, 0.4 mmol) in THF (4 mL), were added lithium hydroxide (20 mg, 0.8 mmol) and two drops of water. The mixture was then refluxed for 2 hr. After cooling to room temperature, the mixture was evaporated in vacuo and the residue was purified by silica gel column chromatography (eluent, from ethyl acetate to 20% methanol in ethyl acetate) to give 100 mg (62%) of {1-[6-(3-cyano-5-methyl-benzoyl)-5-isopropyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-ylmethyl]-cyclopropyl}-acetic acid (83) as a white solid. m.p. 244-245° C.; 1H-NMR (500 MHz, DMSO-d6) δ 0.21-0.26 (2H, m), 0.34-0.36 (1H, m), 0.46-0.48 (1H, m), 0.98 (3H, d, J=6.8 Hz), 1.08 (3H, d, J=6.8 Hz), 2.06-2.12 (2H, m), 2.23 (1H, d, J=17.0 Hz), 2.44 (3H, s), 3.32 (1H, d, J=15.0 Hz), 3.74 (1H, d, J=15.0 Hz), 8.08 (1H, s), 8.19 (1H, s), 8.43 (1H, s), 11.45 (1H, s), 12.02 (1H, br. s); m/z (EI) 409 (M+).

1. temperatureThe mixture was then refluxed for 2 hr
2. customthe mixture was evaporated in vacuo
3. customthe residue was purified by silica gel column chromatography (eluent, from ethyl acetate to 20% methanol in ethyl acetate)