US3678082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Esterification of 17-hydroxy steroids
Assignee: GD Searle LLC
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Filing: 1970-07-30
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Granted: 1972-07-18
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Expires: 1990-07-30
Abstract
Abstract 17-Hydroxy steroids can be esterified in nearly quantitative yields using the appropriate anhydride with 4dimethylaminopyridine.
Inventors
- 👤 Hugh L Dryden Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:03
CPC Classifications
C; C07; C07J; C07J1/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
45 words
A process according to claim 1 for the preparation of lower alkanoyl esters of 17 Alpha -ethynyl-17 Beta -hydroxy steroids which comprises reacting a 17 Alpha -ethynyl-17 Beta -hydroxy steroid with a lower alkanoic acid anhydride in the presence of 4-dimethylaminopyridine and a tertiary amine.
Claim 2
Dependent Claim
39 words
A process according to claim 1 for the preparation of 17 Alpha -ethynyl-4-estrene-3 Beta ,17 Beta -diol diesters which comprises reacting 17 Alpha -ethynyl-4-estrene-3 Beta ,17 Beta -diol with a lower alkanoic acid anhydride in the presence of 4-dimethylaminopyridine.
Claim 3
Dependent Claim
36 words
A process according to claim 1 for the preparation of 17 Alpha -ethynyl-4-estrene-3 Beta ,17 Beta -diol diacetate which comprises reacting 17 Alpha -ethynyl-4-estrene-3 Beta ,17 Beta -diol with acetic anhydride in the presence of 4-dimethylaminopyridine.
Claim 4
Dependent Claim
38 words
A process according to claim 1 for the preparation of 17 Alpha -ethynyl-4-estrene-3 Beta ,17 Beta -diol diacetate which comprises reacting 17 Alpha -ethynyl-4-estrene-3 Beta ,17 Beta -diol with acetic anhydride in the presence of 4-dimethylaminopyridine and triethylamine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |