Ring-closure method for 1-carbacephalosporin six-membered ring
US5089610A · kind A · utility
1Cited by
1References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 25, 1991 |
| Grant date | Feb 18, 1992 |
| Priority date | — |
| Expiry date | Apr 25, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D463/04
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention provides a process for preparing 7-protected amino-4-protected carboxy-1-carbacephalosporins which includes subjecting a 3-protected-amino-4-(1-propylene oxide)-methyl(protected carboxy)-azetidin-2-one to a strong base to form a 2-hydroxycepham and thereafter dehydrating the 2-hydroxycepham to form the desired 1-carbacephalosporin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.