Hydrochloric Acid → 6-((1-(4-chlorophenyl)cyclopentyl)methyl)-9-hydroxy-2-phenyl-3,4-dihydro-1H-pyrazino[1,2-c]pyrimidine-1,8(2H)-dione

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 9-(benzyloxy)-6-((1-(4-chlorophenyl)cyclopentyl)methyl)-2-phenyl-3,4-dihydro-1H-pyrazino[1,2-c]pyrimidine-1,8(2H)-dione (49) (88.5 mg, 164 μmol, Eq: 1.00) in methanol (5 ml) was added HCl (conc) (240 mg, 0.2 ml, 6.58 mmol, Eq: 40.2). The reaction mixture was heated at 70° C. for 18 hrs, neutralized with saturated aqueous NaHCO3 solution, extracted with dichloromethane, dried (MgSO4), concentrated, triturated with diethyl ether, filtered, and dried to obtain 6-((1-(4-chlorophenyl)cyclopentyl)methyl)-9-hydroxy-2-phenyl-3,4-dihydro-1H-pyrazino[1,2-c]pyrimidine-1,8(2H)-dione (50) (pink powder, 48.2 mg, 107 μmol, 65.4% yield).

Provenance & Evidence