Modulators of atp-binding cassette transporters
US-2016318931-A1 · Nov 3, 2016 · US
Process for the preparation of donepezil hydrochloride
US8987458B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8987458-B2 |
| Application number | US-93424509-A |
| Country | US |
| Kind code | B2 |
| Filing date | Mar 24, 2009 |
| Priority date | Mar 25, 2008 |
| Publication date | Mar 24, 2015 |
| Grant date | Mar 24, 2015 |
How to read this patent
A practical reading order for non-experts. Skip the full description unless you need deep technical detail.
- Title
What the patent document calls the invention.
- Abstract
A short plain-language summary of the technical disclosure.
- Assignees and inventors
Who owns or filed the patent and who is credited as inventor.
- Key dates
Filing, priority, publication, and grant dates set the timeline.
- First independent claim
The legal scope of protection — read this for what is actually claimed.
- CPC / IPC classifications
Technology tags used to group this patent with similar filings.
- Citations and related patents
Prior art links and similar publications in this corpus.
Abstract
Official abstract text for this publication.
The present invention provides a process for preparing donepezil or a salt thereof, the process comprising reducing a 1-benzyl-4-[(5,6-dimethoxy-1-indanon-2-yl)methylene]pyridonium halide of formula II, wherein X is bromide or chloride, in the presence of an ionic compound, a solvent, a catalyst and a source of hydrogen, to form donepezil and optionally converting the donepezil to the salt thereof.
First claim
Opening claim text (preview).
The invention claimed is: 1. A process for preparing donepezil or a salt thereof, the process comprising reducing a 1-benzyl-4-[(5,6-dimethoxy-1-indanon-2-yl)methylene]pyridonium halide of formula II wherein X − is chloride or bromide, in the presence of an ionic compound, a solvent, a catalyst and a source of hydrogen, to form donepezil and optionally converting donepezil to…
Assignees
Inventors
Classifications
Human Necessities · mapped topic
Chemistry & Metallurgy · mapped topic
- C07D213/20Primary
Chemistry & Metallurgy · mapped topic
Patent family
Related publications grouped by family.
External sources
Next steps
Free tools are coming soon. Tell us what you want to track and we'll notify you.
Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US8987458B2 cover?
- The present invention provides a process for preparing donepezil or a salt thereof, the process comprising reducing a 1-benzyl-4-[(5,6-dimethoxy-1-indanon-2-yl)methylene]pyridonium halide of formula II, wherein X is bromide or chloride, in the presence of an ionic compound, a solvent, a catalyst and a source of hydrogen, to form donepezil and optionally converting the donepezil to the salt ther…
- Who is the assignee on this patent?
- Rao Dharmaraj Ramachandra, Kankan Rajendra Narayanrao, Pathi Srinivas Laxminarayan, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification C07D213/20. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Mar 24 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).