Patent US2643671A successfully refreshed from Google Patents.
Patent US4033969A successfully refreshed from Google Patents.
US4033969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vincamine derivatives
Assignee: Bpifrance Financement SA
•
Filing: 1975-09-29
•
Granted: 1977-07-05
•
Expires: 1995-09-29
Abstract
Abstract New compounds having the formula ##STR1## in which Y represents a hydrogen atom, in which case Z 1 and Z 2 represent simultaneously an oxygen atom, or Z 1 represents a methoxycarbonyl radical and Z 2 a hydroxy radical, or Y and Z 2 form together a carbon-carbon bond and Z 1 is a methoxycarbonyl radical, said compounds being additionally characterized by a cis-fusion of the D/E rings. Said new compounds and vincamine and certain of its derivatives are prepared from an enamine having the formula : ##STR2## in which R is H or C 2 H 5 .
Inventors
- 👤 Thierry Sevenet
- 👤 Claude Thal
- 👤 Pierre Potier
- 👤 Henri Philippe Husson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:32
CPC Classifications
C; C07; C07D; C07D461/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
19 words
20-Deethyl-vincamine, under its racemic and optically active forms, having the formula: ##STR8## and its stereoisomer, having the formula: ##STR9##
Claim 2
Dependent Claim
19 words
20-Deethyl-vincamine, under its racemic and optically active forms, having the formula: ##STR8## and its stereoisomer, having the formula: ##STR9##
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |