Reaction Steps
To a stirred mixture of 3-(5-amino-2-methyl-4-oxo-4H-quinazolin-3-yl)-piperidine-2,6-dione (0.49 g, 1.6 mmol) in tetrahydrofuran (10 mL), was added heptanoyl chloride (0.88 mL, 5.7 mmol) and heated at 80° C. for two hours. The mixture was quenched with a few drops of methanol. The solvent was evaporated, and the residue was purified by flash column chromatography (Silica gel, methanol/methylene chloride 4%/96%) to give heptanoic acid [3-(2,6-dioxo-piperidin-3-yl)-2-methyl-4-oxo-3,4-dihydro-quinazolin-5-yl]-amide as a white solid (120 mg, 18% yield); HPLC, Waters Symmetry C18, 5 μm, 3.9×150 mm, 1 mL/min, 240 nm, 10/90 CH3CN/0.1% H3PO4, gradient to 95/5 in 5 min, kept for 5 min, 7.12 min (95.5%); mp, 230-232° C.; 1HNMR (DMSO-d6) δ 0.86 (t, J=7 Hz, 3H, CH3), 1.24-1.36 (m, 6H, 3CH2), 1.56-1.65 (m, 2H, CH2), 2.18-2.23 (m, 1H, CHH), 2.40 (t, J=7 Hz, 2H, CH2), 2.59-2.88 (m, 6H, CHCH2, CH3), 5.32 (dd, J=6, 11 Hz, 1H, CH), 7.26-8.55 (m, 3H, Ar), 11.09 (s, 1H, NH), 11.74 (s, 1H, NH); 13C NMR (DMSO-d6) δ 13.87, 20.65, 21.89, 23.35, 24.66, 28.05, 30.60, 30.95, 37.64, 56.73, 107.43, 115.12, 120.32, 135.63, 139.85, 147.86, 154.71, 163.07, 169.28, 171.51, 172.57. LCMS MH=399; Anal Calcd For C21H26N4O4+0.3H2O: C, 62.45; H, 6.64; N, 13.87. Found: C, 62.28; H, 6.66; N, 13.61.
