Process for the preparation of arylamides of heteroaromatic carboxylic acids
US6635766B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1997 |
| Grant date | Oct 21, 2003 |
| Priority date | — |
| Expiry date | Dec 19, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J2531/824
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of arylamides of heteroaromatic carboxylic acids of the formula: in which each An is nitrogen or CRn(n=1 to 5), with the proviso that at least one of the ring members is nitrogen and that two nitrogen atoms are not bonded directly to one another; R1 to R5, if present, independently of one another; C1-4-alkyl or aryl, one of the substituents R1 to R5 being a group of the formula —OR, in which R is an optionally substituted aromatic or heteroaromatic radical; R6 is hydrogen or C1-4-alkyl; and R7 is an optionally substituted aromatic or heteroaromatic radical. The amides are obtained from the corresponding heteroaromatic halogen compounds, the corresponding aromatic amines and carbon monoxide in the presence of palladium diphosphine complex. Compounds of this class (Formula I) are important herbicides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.