Methanol → 9-hydroxy-2-methyl-6-(1-pyridin-2-yl-cyclopentylmethyl)-3,4-dihydro-2H-pyrazino[1,2-c]pyrimidine-1,8-dione

Participants

Reaction Steps

To a stirred solution of 9-benzyloxy-2-methyl-6-(1-pyridin-2-yl-cyclopentylmethyl)-3,4-dihydro-2H-pyrazino[1,2-c]pyrimidine-1,8-dione (444) (60 mg, 0.135 mmol) in ethanol (5 mL), Pd—C (10%, w/w; 10 mg) was added and the reaction mixture was allowed to stir for 1 h in a hydrogen atmosphere at balloon pressure, while silica thin layer chromatography was performed (10% methanol in dichloromethane, Rf=0.3). After completion of the reaction, the reaction mixture was filtered through a celite bed and concentrated. The resulting crude product was triturated with 70% ethyl acetate in hexane to get 9-hydroxy-2-methyl-6-(1-pyridin-2-yl-cyclopentylmethyl)-3,4-dihydro-2H-pyrazino[1,2-c]pyrimidine-1,8-dione (445) (31 mg, 65%) as a white solid.

Provenance & Evidence