Synthesis of Donepezil Hydrochloride Ring-opening Impurity
Abstract:
The Donepezil hydrochloride ring-opening impurity with the yield of 31 . 2% and purity of 98 . 8% was synthesized by a one-pot reaction of Donepezil hydrochloride with diethyl oxalate and hy-drogen peroxide. The structure was confirmed by 1 H NMR and MS( ESI) .