Process for the preparation of cephem derivatives and intermediates therefor
US5128465A · kind A · utility
2Cited by
4References
3Claims
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Key dates
| Filing date | Jan 22, 1990 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Jan 22, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/55
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A cephem derivative represented by the following formula: ##STR1## wherein R.sub.1 means a fluorine-substituted lower alkyl and A.sub.1 denotes a cyclic or acyclic ammonio group, or a non-toxic salt thereof, is prepared by reacting a compound represented by the following formula: ##STR2## wherein A.sub.1 has the same meaning as defined above, with another compound represented by the following formula: ##STR3## wherein R.sub.1 has the same meaning as defined above, and if necessary, removing the protecting groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.