US4290947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of thienamycin and intermediates
Assignee: Merck and Co Inc
•
Filing: 1980-05-29
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Granted: 1981-09-22
•
Expires: 2000-05-29
Abstract
Abstract Disclosed is a process for the total synthesis of thienamycin from L-aspartic acid via intermediate III: ##STR1## R=H, blocking group or salt cation.
Inventors
- 👤 Burton G. Christensen
- 👤 Ronald W. Ratcliffe
- 👤 Thomas N. Salzman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:39
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/10; C07D; C07D205/00; C07D205/02; C07D205/06; C07D205/08; C07D477/00; C07D477/02; C07D477/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
18 words
The compound: ##STR31## wherein R 1 is a protecting group selected from t-butyl-dimethylsilyl, t-butyldiphenylsilyl, triphenylsilyl, isopropyldimethylsilyl, and 3,4-dimethoxybenzyl.
Claim 2
Dependent Claim
18 words
The compound: ##STR31## wherein R 1 is a protecting group selected from t-butyl-dimethylsilyl, t-butyldiphenylsilyl, triphenylsilyl, isopropyldimethylsilyl, and 3,4-dimethoxybenzyl.
References Cited (Backward Citations)
US4122086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-21 | 1985-03-23 | 1985-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-21 | 1989-03-23 | 1989-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-21 | 1993-03-23 | 1993-09-22 | $7700.00 | Window Closed / Lapsed |