Polychalcogen ester of cephem compound, process for preparing the same and method for removing the protective group of the same
US4225706A · kind A · utility
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7Claims
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Key dates
| Filing date | Apr 21, 1978 |
| Grant date | Sep 30, 1980 |
| Priority date | — |
| Expiry date | Apr 21, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/55
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A novel ester of a cephem compound having a carboxyl group at the 4-position in the nucleus; a process for preparing the same by reacting a cephem carboxylic acid or its salt with a halogenide; and a method for removing the protective group for the carboxyl group in the nucleus of a cephem compound by contacting it with an alcohol, or with an organic solvent in the presence of a Lewis acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.