US4054740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydroxybiotin
Assignee: Hoffmann La Roche Inc
•
Filing: 1975-09-05
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Granted: 1977-10-18
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Expires: 1995-09-05
Abstract
Abstract This invention relates to a synthesis of biotin by the reduction of dehydrobiotin. The dehydrobiotin is prepared from 6-hydroxy-7-nitro-heptanoic acid methyl ester. Novel intermediates are also obtained by this synthesis.
Inventors
- 👤 George Francis Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:05
CPC Classifications
C; C07; C07D; C07D495/00; C07D495/02; C07D495/04; C07C; C07C205/00; C07C205/49; C07C205/50; C07C323/00; C07D333/00; C07D333/02; C07D333/04; C07D333/26; C07D333/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
25 words
A compound of the formula: ##STR21## wherein R 1 is lower alkoxy, hydroxy, lower alkyl substituted or unsubstituted amino; the racemates and optical antipodes thereof.
Claim 2
Dependent Claim
25 words
A compound of the formula: ##STR21## wherein R 1 is lower alkoxy, hydroxy, lower alkyl substituted or unsubstituted amino; the racemates and optical antipodes thereof.
Claim 3
Dependent Claim
10 words
The compound of claim 1 wherein R 1 is hydroxy.
Claim 4
Dependent Claim
10 words
The compound of claim 1 wherein R 1 is methoxy.
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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |