反应详情

A solution of 9-hydroxy-7-isopropyl-2-(1-propenyl)-3,4-dihydro-2H-pyrazino[1,2-c]pyrimidine-1,6,8(7H)-trione (1.8 g, 6.4 mmol) in MeOH (15 mL) and 6 N aqueous HCl (10 mL) was heated to reflux for 1 h. The solvents were removed in vacuo and the residue was triturated in MeOH to give the title compound as a solid. HPLC RT=2.14 min (Method A); ES MS (M+H)=240; 1H NMR (400 MHz, DMSO-d6) δ 11.5 (v broad s, 1H), 9.19 (s, 1H), 5.04 (septet, J=7 Hz, 1H), 3.87 (t, J=7 Hz, 2H), 3.46 (m, 2H), 1.38 (d, J=7 Hz, 6H).

1. temperatureto reflux for 1 h
2. customThe solvents were removed in vacuo
3. customthe residue was triturated in MeOH