Reaction Steps
To a stirred mixture of 3-(5-aminomethyl-2-methyl-4-oxo-4H-quinazolin-3-yl)-piperidine-2,6-dione hydrogen chloride (0.53 g, 1.6 mmol) in acetonitrile (10 mL), was added butyryl chloride (0.25 mL, 2.4 mmol) and N,N-diisopropyl ethylamine (0.65 mL, 3.9 mmol). The mixture was stirred at room temp for 15 minutes. The solvent was evaporated, and the residue was purified by flash column chromatography (Silica gel, methanol/methylene chloride 4%/96%) to give N-[3-(2,6-dioxo-piperidin-3-yl)-2-methyl-4-oxo-3,4-dihydro-quinazolin-5-ylmethyl]-butyramide as a light yellow solid (270 mg, 46% 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, 5.18 min (98.6%); mp, 250-252° C.; 1HNMR (DMSO-d6)0.88 (t, J=7 Hz, 3H, CH3), 1.56 (m, J=7 Hz, 2H, CH2CH2CH3), 2.15-2.20 (m, 3H, CH2, CHH), 2.57-2.89 (m, 6H, CHCH2, CH3), 4.77-4.85 (m, 2H, CH2NH), 5.23 (dd, J=6, 11 Hz, 1H, CH), 7.30-7.76 (m, 3H, Ar), 8.18 (t, J=5 Hz, 1H, CH2NH), 11.02 (s, 1H, NH); 13C NMR (DMSO-d6) δ 13.65, 18.67, 20.77, 23.27, 30.58, 37.32, 41.39, 56.47, 117.63, 124.28, 125.38, 133.83, 141.23, 148.44, 154.76, 160.95, 169.51, 172.14, 172.60. LCMS MH=371; Anal Calcd For C19H22N4O4: C, 61.61; H, 5.99; N, 15.13. Found: C, 61.49; H, 5.76; N, 15.00.
