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US 6,649,765 B1Granted
Process for the preparation of 1-benzyl-4(5,6-dimethoxy-1-indanon)-2-yl) methyl piperidine hydrochloride (Donepezil HCL)
AssigneeUSV Limited, BSD MARG.
InventorsJoshi Shreerang Vidyadhar, Naidu Avinash Venkatraman, Sutar Rajiv Pandurang
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Abstract
A process for the preparation of 1-benzyl-4-[(5,6-dimethoxy-1-indanon)-2-yl]methylpiperidine hydrochloride (Donepezil HCl). 5,6-Dimethoxy-2-(pyridin-4-yl)methylene inda-1-one is hydrogenated with a noble metal oxide catalyst in an organic solvent at 20-50° C. and 10-45 psi gauge pressure. The resulting 4-[(5,6-dimethoxy-1-indanon)-2-yl]methyl piperidine is alkylated with an alkylating agent in an organic solvent at 30-80° C.
Claims7
A process for the preparation of 1-benzyl-4-[(5,6-dimethoxy-1-indanon)-2-yl]methylpiperidine hydrochloride (Donepezil HCl) of the formula I
- comprising hydrogenating 5,6-Dimethoxy-2-(pyridin-4-yl)methylene inda-1-one with a noble metal oxide catalyst in an organic solvent at 20-50° C. and 10-45 psi gauge pressure to form 4-[(5,6-dimethoxy-1-indanon)-2-yl]methyl piperidine of the formula II
- which is alkylated with an alkylating agent in an organic solvent at 20-80° C.
Dependencies are inferred from the claim text.