Epimerization of malonic acid esters
US4504658A · kind A · utility
51Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1983 |
| Grant date | Mar 12, 1985 |
| Priority date | — |
| Expiry date | Jun 14, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/55
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A compound represented by the formula (II) epimerizes by the action of a base and the product is precipitated for shifting the equilibrium to yield the corresponding epimer represented by the formula (I). ##STR1## wherein Ar is an optionally substituted aryl or heterocyclic group; PA1 Tet is an optionally substituted tetrazolyl group and PA1 B.sup.1 and B.sup.2 are each ester forming group in the field of penicillin or cephalosporin chemistry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.