Phosphoric acid isomerization of A 5 (10), 9 (11)—diene steroid to the corresponding 4, 9-diene steroid
US6797834B2 · kind B2 · utility
0Cited by
1References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 10, 2002 |
| Grant date | Sep 28, 2004 |
| Priority date | — |
| Expiry date | Apr 14, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07J1/0022
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention is a process for the preparation of a &Dgr;4,9-steroid of formula (II) which comprises contacting a &Dgr;5(10),9(11)-steroid of formula (I) with a phosphorous containing acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.