Reaction Steps
The stirred mixture of 3-(5-amino-2-methyl-4-oxo-4H-quinazolin-3-yl)-piperidine-2,6-dione (4.0 g, 14 mmol) and chloroacetyl chloride (7.7 mL, 98 mmol) was heated in a 100° C. oil bath for 15 minutes. The mixture was allowed to cool to room temperature. Acetonitrile (5 mL) was added to the mixture. The suspension was filtered and washed with ethyl acetate (2×10 mL) to give a white solid. The solid was stirred in methanol (50 mL) overnight. The suspension was filtered and washed with methanol (20 mL) to give 2-chloro-N-[3-(2,6-dioxo-piperidin-3-yl)-2-methyl-4-oxo-3,4-dihydro-quinazolin-5-yl]-acetamide as a white solid (4.5 g, 90% yield): HPLC: Waters Symmetry C18, 5 μm, 3.9×150 mm, 1 mL/min, 240 nm, 20/80 CH3CN/0.1% H3PO4, 12.79 min (97.6%); mp: 275-277° C.; 1H NMR (DMSO-d6) δ 2.18-2.25 (m, 1H, CH2), 2.61-2.80 (m, 5H, CH3, 2CHH), 2.86-2.91 (m, 1H, CHH), 4.48-4.53 (m, 2H, CH2), 5.36 (dd, J=6, 11 Hz, 1H, NCH), 7.39 (dd, J=1, 8 Hz, 1H, Ar), 7.83 (t, J=8 Hz, 1H, Ar), 8.57 (dd, J=1, 8 Hz, 1H, Ar), 10.7 (brs, 1H, HCl), 11.11 (s, 1H, NH), 12.26 (s, 1H, NH); 13C NMR (DMSO-d6) δ 20.66, 23.10, 30.60, 43.56, 56.84, 107.89, 115.65, 120.87, 135.77, 138.87, 147.17, 155.49, 162.67, 165.55, 169.14. 172.60; LCMS: MH=363, 365; Anal Calcd for C16H15N4O4Cl+1.05HCl: C, 47.92; H, 4.03; N, 13.97; Cl, 18.12. Found: C, 48.24; H, 3.79; N, 13.84; Cl, 18.27.
