Process for the preparation of 2-substituted 5-chloroimidazole-4-carbaldehydes
US5536841A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1995 |
| Grant date | Jul 16, 1996 |
| Priority date | — |
| Expiry date | Jun 19, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D233/68
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for preparing 2-substituted 5-chloroimidazole-4-carbaldehydes of the general formula: ##STR1## In the process, a glycine ester hydrohalide is ring-closed with an imidate ester to obtain the intermediate 2-substituted 3,5-dihydroimidazol-4-one. This intermediate is converted with an N,N-substituted formamide acetel into an N,N-substituted aminomethyleneimidazolinone. This latter intermediate is chlorinated with phosphorus oxychloride or phosgene to obtain the final product 2-substituted 5-chlorimidazole-4-carbaldehydes of the general formula I. Also disclosed are N,N-substituted aminomethyleneimidazolinones of the general formula: ##STR2## wherein R is hydrogen or is an alkyl group, an alkenyl group, a cycloalkyl group, an arylalkyl group or an aryl group, and R.sub.5 and R.sub.6 are identical or different and each is an alkyl group or an aryl group, in the form of the E- or Z-isomer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.