Synthesis of steroids
US4174345A · kind A · utility
13Cited by
0References
12Claims
0Family size
Inventor
Key dates
| Filing date | Aug 1, 1978 |
| Grant date | Nov 13, 1979 |
| Priority date | — |
| Expiry date | Aug 1, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07J9/005
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
In the synthesis of sterols wherein methoxyethoxymethyl groups in an ether linkage are attached to the nucleus of the sterol to protect the sterol nucleus during other steps of the synthesis and the sterols are thereafter treated to remove the methoxyethoxymethyl groups and set free the hydroxyl groups, the improvement in which the sterols being treated with zinc bromide are held in a methylene chloride solution containing a small amount of an aliphatic alcohol having from 1 to 6 carbon atoms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.