US3904698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steroid synthesis
Assignee: Leland Stanford Junior University
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Filing: 1972-08-17
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Granted: 1975-09-09
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Expires: 1992-08-17
Abstract
Abstract Synthesis of steroids by cyclization of a dienyne terminating at one end of the molecule in an acetylenic group and at the other end in a cyclohexene ring wherein the olefinic group forms an allylic group with a substituent such as a thioketal or hydroxy group. Invention includes novel synthesis of the cyclization substrate, novel substrate and novel intermediates, whereby resolution of racemic mixtures and the production of d, l and dl enantiomers are made possible.
Inventors
- 👤 William S Johnson
- 👤 Ronald L Markezich
- 👤 Brian E Mccarry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:57
CPC Classifications
C; C07; C07C; C07C403/00; C07C403/02; C07C403/06; C07C403/08; C07C45/00; C07C45/56; C07C45/57; C07C45/59; C07C49/00; C07C49/587; C07C49/647; C07D; C07D339/00; C07D339/02; C07D339/06; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/54; C07F9/5407; C07J; C07J63/00; C07J63/008; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
3 words
COMPOUNDS OF FORMULA
Claim 2
Dependent Claim
3 words
COMPOUNDS OF FORMULA
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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |