Process for the preparation of 6-halo-pregnanes
US4188322A · kind A · utility
5Cited by
2References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 28, 1978 |
| Grant date | Feb 12, 1980 |
| Priority date | — |
| Expiry date | Apr 28, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07J71/0015
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a new process for the preparation of 6.alpha.-halo-3-keto-.DELTA..sup.1,4 -pregnadiene-derivatives in two-steps-synthesis affording directly 6.alpha.-halo-derivatives by reacting 3-keto-9.beta.,11.beta.-oxido-.DELTA..sup.1,4 -pregnadiene-derivatives with a suitable acylating or etherifying agent to give the corresponding new 3-enol-derivatives which are finally halogenated by using a suitable halogenating agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.