Process for 3-hydroxy benzodiazepinones
US4412952A · kind A · utility
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3References
8Claims
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Key dates
| Filing date | Apr 30, 1982 |
| Grant date | Nov 1, 1983 |
| Priority date | — |
| Expiry date | Apr 30, 2002 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D243/24
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Conversion of 3-acyloxy-benzodiazepin-2-ones into corresponding 3-hydroxy benzodiazepin-2-ones is carried out efficiently with potassium hydroxide or potassium alkoxide as catalyst in lower alkanol solvent at a pH of 11-11.5. The final products, which include temazepam, are useful as sleep inducers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.