Process for the purification of N-morpholinoalkyl dihydropyridines
US4503223A · kind A · utility
6Cited by
1References
23Claims
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Assignee
Inventor
Key dates
| Filing date | Aug 11, 1983 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Aug 11, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D211/90
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
N-Morpholinoalkyl dihydropyridines are purified by precipitating their acid addition salts in an acidic organic solvent, dissolving the precipitate in a two-phase solvent system and crystallizing the N-morpholinoalkyl dihydropyridines from the organic phase of the two-phase solvent system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.