反应详情

2-[1-(3-Cyclopentyloxy-4-methoxyphenyl)-2-(1,3,4-oxadiazol-2-yl)ethyl]-4-methylisoindoline-1,3-dione was prepared by the procedure of Example 1. Reaction of 3-(3-cyclopentyloxy-4-methoxyphenyl)-3-(4-methyl-1,3-dioxoisoindolin-2-yl)propanoic acid (2.23 g, 5.27 mmol), carbonyldiimidazole (0.94 g, 5.8 mmol) and formic hydrazide (382 mg, 6.36 mmol) in ethyl acetate (20 mL) gave crude N-carbonylamino-3-(3-cyclopentyloxy-4-methoxyphenyl)-3-(4-methyl-1,3-dioxoisoindolin-2-yl)propanamide (1.71 g, 3.67 mmol), which was then treated with phosphorus oxychloride (0.8 mL, 8.6 mmol) in acetonitrile (10 mL). The product was obtained as a white solid (368 mg, 16% overall yield): mp, 126.0-128.5° C.; 1H NMR (CDCl3) δ 1.21-1.99 (m, 8H, C5H8), 2.66 (s, 3H, CH3), 3.81 (s, 3H, CH3), 3.82 (dd, J=6.1, 15.8 Hz, 1H, CHH), 4.37 (dd, J=10.3, 15.6 Hz,1H, CHH), 4.76-4.83 (m,1H, OCH), 5.80 (dd, J=5.9, 10.3 Hz, 1H, NCH), 6.81 (d, J=8.4 Hz, 1H, Ar), 7.09-7.18 (m, 2H, Ar), 7.43 (d, J=7.6 Hz, 1H, Ar), 7.54 (t, J=7.4 Hz, 1H, Ar), 7.62 (d, J=7.1 Hz, 1H, Ar), 8.29 (s, 1H, CH); 13C NMR (CDCl3) δ 17.45, 24.00, 27.67, 32.68, 51.57, 55.94, 80.44, 111.69, 114.55, 120.13, 120.98, 128.25, 130.22, 132.01, 133.50, 136.44, 138.08, 147.68, 149.99, 152.93, 164.04, 167.95, 168.56; Anal Calcd for C25H25N3O5: C, 67.10; H, 5.63; N, 9.39. Found: C, 67.14; H, 5.55; N, 9.19.