Cephalosporin derivatives
US4503220A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 1982 |
| Grant date | Mar 5, 1985 |
| Priority date | — |
| Expiry date | Aug 16, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F9/65613
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
3-Vinylcephalosporin derivatives of the formula: ##STR1## in which the symbols R.sub.1 are phenyl radicals or radicals --OZ.sub.1 (it being possible for Z.sub.1 to be alkyl, 2,2,2-trichloroethyl or optionally substituted phenyl or benzyl, or for the radicals Z.sub.1 to form an alkylene radical), R.sub.2 is a radical which can be removed by an enzymatic method, or a protecting radical, and R.sub.3 and R.sub.4 are optionally substituted alkyl, or phenyl, or together form a saturated 5-membered or 6-membered heterocyclic ring optionally containing another hetero-atom, are new, crystallizable intermediates useful for the preparation of anti-bacterial cephalosporins.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.