Reaction Steps
To a stirred suspension of 3-(6-aminomethyl-2-methyl-4-oxo-4H-quinazolin-3-yl)-piperidine-2,6-dione hydrogen chloride (0.51 g, 1.5 mmol) in acetonitrile (10 mL), was added cyclopropanecarbonyl chloride (0.21 mL, 2.3 mmol) and N,N-diisopropyl ethylamine (0.62 mL, 3.8 mmol). The mixture was stirred at room temperature for one hour. The solvent was evaporated, and the residue was purified by flash column chromatography (Silica gel, methanol/methylene chloride 4%/96%) to give cyclopropanecarboxylic acid [3-(2,6-dioxo-piperidin-3-yl)-2-methyl-4-oxo-3,4-dihydro-quinazolin-6-ylmethyl]-amide as an off-white solid (233 mg, 42% 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, 5.01 min (98.4%); mp, 281-283° C.; 1HNMR (DMSO-d6) 0.64-0.74 (m, 4H, CH2CH2 of cyclopropane ring), 1.57-1.66 (m, 1H, CH of cyclopropane ring), 2.15-2.21 (m, 1H, CH), 2.57-2.89 (m, 6H, CHCH2, CH3), 4.39 (d, J=5 Hz, 2H, CH2NH), 5.26 (dd, J=6, 11 Hz, 1H, CH), 7.57-7.89 (m, 3H, Ar), 8.68 (t, J=6 Hz, 1H, CH2NH), 11.03 (s, 1H, NH); 13C NMR (DMSO-d6) 66.31, 13.55, 20.93, 23.40, 30.61, 41.77, 56.53, 120.01, 123.78, 126.58, 134.02, 138.34, 145.78, 154.55, 160.44, 169.47, 172.62, 172.70. LCMS MH=413; Anal Calcd For C19H20N4O4: C, 61.95; H, 5.47; N, 15.21. Found: C, 61.86; H, 5.49; N, 15.04.
