Methods for preparing D-threo methylphenidate using diazomethane, and compositions thereof
US9233924B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2014 |
| Grant date | Jan 12, 2016 |
| Priority date | — |
| Expiry date | Mar 11, 2034 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2219/24
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Novel methods and systems for producing a substantially pure d-threo stereoisomer of methylphenidate or a salt thereof are provided. In particular, methods and systems for producing d-threo-methylphenidate hydrochloride in pure stereoisomeric form from d-threo-ritalinic acid hydrochloride using diazomethane are described. The described methods can be performed on a large scale, and thus provide d-threo methylphenidate or a salt thereof, and particularly the hydrochloride salt of d-threo-methylphenidate, in stereoisomerically pure form and in large quantities from a single batch reaction. Also described are novel compositions of d-threo methylphenidate hydrochloride.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.