Reaction Steps
2-[1-(3,4-Dimethoxyphenyl)-2-(1,3,4-oxadiazol-2-yl)ethyl]isoindoline-1,3-dione was prepared by the procedure of Example 8 from 3-(3,4-dimethoxyphenyl)-3-(1,3-dioxoisoindolin-2-yl)propanoic acid (2.0 g, 3.6 mmol), carbonyidiimidazole (1.0 g, 6.2 mmol), formic hydrazide (0.41 g, 6.8 mmol), and phosphorus oxychloride (1.3 mL, 14 mmol) in acetonitrile (20 mL). The product was obtained as a white solid (730 mg, 34% yield): mp, 83.0-85.0° C.; 1H NMR (CDCl3) δ 3.82 (dd, J=6.0, 16.0 Hz, 1H, CHH), 3.85 (s, 3H, CH3), 3.90 (s, 3H, CH3), 4.39 (dd, J=10.3, 15.7 Hz, 1H, CHH), 5.84 (dd, J=6.0, 10.3 Hz, 1H, NCH), 6.81-6.85 (m, 1H, Ar), 7.16-7.19 (m, 2H, Ar), 7.68-7.73 (m, 2H, Ar), 7.77-7.83 (m, 2H, Ar), 8.30 (s, 1H, CH); 13C NMR (CDCl3) δ 27.66, 51.76, 55.79, 55.89, 111.00, 111.07, 120.29, 123.3,8, 130.16, 131.55, 134.07, 149.03, 149.11, 152.96, 163.90, 167.86; Anal Calcd for C20H17N3O6+0.3 Et2O: C, 63.22; H, 5.20; N, 10.32. Found: C, 63.40; H, 5.02; N, 10.46. (1H NMR showed that the sample contained 30% of ether).
