Process for preparing alpha-acyloxy ketone steroids
Abstract
Abstract THIS DISCLOSES A PROCESS USEFUL FOR PREPARING 3-KETO-19NOR-$4,9(10) STEROIDS, WHICH HAVE KNOWN USES, BY TREATING THE CORRESPONDING 3-KETO-10-CARBOXY-$5 STEROIDS WITH ABOUT ONE MOLAR EQUIVALENT OF A POSITIVE HALOGEN ION RELEASING AGENT IN AN ORGAINC TERTIARY AMINE SOLVENT. ALSO DISCLOSED IS A PROCESS USEFUL FOR PREPARING 2B,19-OXIDO STERIODS, WHICH CAN BE CONVERTED IN ACCORDANCE WITH KNOWN PROCEDURES TO USEFUL STEROIDS, BY SIMILAR TREATMENT OF THE CORRESPONDING 3-KETO-10-CARBOXY-5A OR -5B STEROID OR OF A 3-KETO-10-CARBOXY$4,6 STEROID. A SIMILAR PROCESS USEFUL FOR PREPARING KNOWN AND USEFUL A-ACYLOXY KETO STEROIDS FROM THE CORRESPONDING DETO STEROIDS CONTAINING AN A-HYDROGEN ATOM IS ALSO DISCLOSED.
Inventors
- 👤 Francisco Alvarez
Bibliographic Details
Claims Analysis
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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) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |