Process for preparing substituted 2-alkoxycarbonyl-3-aminothiophenes
US7923571B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Dec 14, 2005 |
| Grant date | Apr 12, 2011 |
| Priority date | — |
| Expiry date | Jan 7, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D333/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a process for preparing 4-alkoxycarbonyl-3-aminothiophenes of the general formula (I)and/or their hydrochlorides of the formula (I)′in which R1 and R2 are each as defined in the description, and/or their mono- or bisacetylated or mono- or bisformylated form,by reacting enamines of the formula (II)in which R1 and R2 are each as defined in the description, and/or their mono- or bisacetylated or mono- or bisformylated form,with a chlorinating agent in the presence of one or more diluents, and also to a process for preparing the compounds of the formula (II).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.