Patent US3700661A successfully refreshed from Google Patents.
US3700661A
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Total steroid synthesis employing substituted isoxazole derivatives
Assignee: F Hoffmann La Roche AG
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Filing: 1968-11-22
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Granted: 1972-10-24
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Expires: 1988-11-22
Abstract
Abstract THE NOVEL INTERMEDIATES AND PROCESSES OF THIS INVENTION PROVIDE A NEW SYNTHETIC ROUTE FOR THE PREPARATION OF PHARMACEUTICALLY VALUABLE 19-NOR-STEROIDS. FURTHER, THE INTERMEDIATES AND PROCESSES OF THE INVENTION PROVIDE A NOVEL ROUTE FOR THE PREPARATION OF PHARMACEUTICALLY VALUABLE ESTRONES. THE PRESENT INVENTION PROVIDES A FACILE TOTAL SYNTHESIS OF 13B-ALKYL-C/D-TRANS-STEROIDAL MATERIALS. THIS DESIRABLE RESULT IS OBTAINED VIA A UNIQUE ASYMMETRIC INDUCTION FOLLOWED BY SUBSEQUENT STEREO-SPECIFIC REACTION STEPS. AS A PRECURSOR TO THE STEROIDAL RING A, A 3,5-DISUBSTITUTED4-ISOXAZOLYLMETHYLENE GROUP IS EMPLOYED IN THIS SYNTHESIS.
Inventors
- 👤 Gabriel Saucy
- 👤 John William Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:57
CPC Classifications
C; C07; C07D; C07D317/00; C07D317/08; C07D317/72; C07D261/00; C07D261/02; C07D261/06; C07D261/08; C07D261/10; C07D261/18; C07D295/00; C07D295/04; C07D295/14; C07D295/145; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/54; C07F9/547; C07F9/6527; C07F9/653; C07J; C07J1/00; C07J1/0051; C07J1/0059; C07J15/00; C07J15/005; C07C; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/06; C07C2603/10; C07C2603/12; C07C2603/16; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/55
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |