Process for the preparation of 4-oxoimidazolinium salts
US5698704A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 3, 1997 |
| Grant date | Dec 16, 1997 |
| Priority date | — |
| Expiry date | Feb 3, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D233/70
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
4-Oxoimidazolinium salts of the general formula: ##STR1## wherein R.sup.1 and R.sup.2 independently of one another are C.sub.1-10 -alkyl, C.sub.2-10 -alkenyl, C.sub.3-7 -cycloalkyl or optionally substituted aryl, arylalkyl, heteroaryl or heteroarylalkyl, or R.sup.1 and R.sup.2, together with the carbon atom to which they are bonded, form a three-membered to seven-membered saturated or unsaturated carbocyclic or heterocyclic ring, R.sup.3 is a C.sub.1-10 -alkyl group, C.sub.1-10 -alkenyl group, C.sub.3-7 -cycloalkyl group, aryl group, arylalkyl group or heteroaryl group, and A.sup.-- is an anion of a strong acid, are prepared by the cyclization of an .alpha.-acylaminonitrile in a nonaqueous solvent, in the presence of a lower alcohol and a strong acid. The compounds are intermediates for pharmaceutical active substances, for example, angiotensin II antagonists.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.