US3923796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Certain 6,7-dioxo-2H-pyrrolo-{8 2,1-b{9 thiazines
Assignee: University of California Berkeley
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Filing: 1973-12-17
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Granted: 1975-12-02
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Expires: 1993-12-17
Abstract
Abstract A process for preparing lactams, particularly 1azabicyclo(4.2.0)octanes, 1-azabicyclo(3.2.0)heptanes, 4-thia-1azabicyclo(3.2.0)heptanes and 5-thia-1-azabicyclo (4.2.0)octenes, which comprises subjecting a cyclic Alpha -ketoamide to an oxidizing agent to form a carboxyl substituted lactam structure. The oxidant is preferably periodate, in an aqueous solution, at pH 5-9 and room temperature. The novel products obtained from the process are useful intermediates in the preparation of antimicrobial agents. The cyclic Alpha -ketoamide starting materials are also novel.
Inventors
- 👤 Henry Rapoport
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:48
CPC Classifications
C; C07; C07D; C07D513/00; C07D513/02; C07D513/04; C07D499/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA:
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA:
Claim 3
Dependent Claim
15 words
A compound according to claim 1 in which R1 is hydrogen, being the compound 4-carboxy-6,7-dioxo-3-methyl-2H-pyrrolo(2,1-b)thiazine.
Claim 4
Dependent Claim
15 words
A compound according to claim 1 in which R1 is methyl, being the compound 4-carbomethoxy-6,7-dioxo-3-methyl-2H-pyrrolo(2,1-b)thiazine.
References Cited (Backward Citations)
US3796711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |