Cyclization to form cephem ring and intermediates therefor
US4332722A · kind A · utility
5Cited by
3References
6Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 27, 1980 |
| Grant date | Jun 1, 1982 |
| Priority date | — |
| Expiry date | Feb 27, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/55
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An intermediate represented by the following formula, for synthesizing --3-hydroxy-3-cephem compounds. ##STR1## wherein A and B each is a hydrogen or amino substituent; R is a hydrogen or thiol substituent; Hal is a halogen; X is a hydroxy or carboxy protecting group; the broken line between A and R shows that when R and B are hydrogens, and A is a carboxylic acyl, the substituents can be combined to form an azetidinothiazoline bicyclic ring; and the enamine derivatives thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.