反应详情

温度

125 °C

A suspension of 3-(2-methyl-6-nitro-4-oxo-4H-quinazolin-3-yl)-piperidine-2,6-dione (4.1 g, 13 mmol) and 20% Pd(OH)2/C (0.9 g) in cyclohexene (20 mL) and DMF (60 mL) was heated in a 125° C. oil bath overnight. The suspension was filtered thru a pad of Celite, and washed with DMF (30 mL). The DMF solution and Charcoal (4 g) were stirred at room temperature for 5 hours. The suspension was filtered thru a pad of Celite. The solvent was removed in vacuo. To the residue, was added DMF (20 mL), and then water (80 mL) to give a suspension. The suspension was filtered and washed with water (50 mL), ethyl acetate (50 mL) and water (50 mL) to give a brown solid, which was purified with preparative HPLC (C18 5/95 for 2 minutes then gradient to 50/50 in 18 min CH3CN/H2O) to give 3-(6-amino-2-methyl-4-oxo-4H-quinazolin-3-yl)-piperidine-2,6-dione as a white solid (1.15 g, 31% yield): HPLC: Waters Xterra C18, 5 μm, 3.9×150 mm, 1 mL/min, 240 nm, 10/90 CH3CN/0.1% NH4HCO2, 5.31 min (99.8%); mp: 314-316° C.; 1H NMR (DMSO-d6) δ2.08-2.14 (m, 1H, CH—H), 2.54 (s, 3H, CH3), 2.55-2.67 (m, 2H, 2CHH), 2.75-2.90 (m, 1H, CHH), 5.16 (dd, J=5, 11 Hz, 1H, NCR), 5.59 (brs, 2H, NH2), 7.04-7.08 (m, 2H, Ar), 7.31-7.34 (m, 1H, Ar), 10.97 (s, 1H, NH); 13C NMR (DMSO-d6) δ 21.06, 22.96, 30.62, 56.22, 105.89, 121.34, 122.61, 127.35, 137.89, 147.63, 149.24, 160.39, 169.68, 172.66; LCMS: MH=287; Anal Calcd for C14H14N4O3+1H2O: C, 55.26; H, 5.30; N, 18.41. Found: C, 54.99; H, 5.22; N, 18.35.

1. filtrationThe suspension was filtered
2. washwashed with DMF (30 mL)
3. filtrationThe suspension was filtered
4. customThe solvent was removed in vacuo
5. additionTo the residue, was added DMF (20 mL)
6. customwater (80 mL) to give a suspension
7. filtrationThe suspension was filtered
8. washwashed with water (50 mL), ethyl acetate (50 mL) and water (50 mL)
9. customto give a brown solid, which
10. customwas purified with preparative HPLC (C18 5/95 for 2 minutes
11. waitthen gradient to 50/50 in 18 min