Process for preparing N-sulphonyl-ureas
US4954628A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Mar 2, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Mar 2, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C311/60
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a process for preparing sulphonyl-ureas of the general formula (I) ##STR1## wherein Ar.sub.1 represents a phenyl, naphthyl or thienyl group, the derivatives thereof substituted by C.sub.1-4 alkyl, C.sub.1-4 haloalkyl, (halo)alkoxycarbonyl, (halo)alkyloxy, nitro, cyano groups as well as by halogen atoms, PA0 Ar.sub.2 represents a phenyl, pyridyl, pirimidinyl or triazinyl group and the derivatives thereof substituted by C.sub.1-4 (halo)alkyl, C.sub.1-4 (halo)alkyloxy, amino, O-acyl, O-arylsulphonyl, O-(substituted carbamoyl) groups as well as by halogen atoms. According to the invention N-halogen aryl sulphonamidate is reacted in the presence of a carbonylating catalyst, carbon monoxide and an aromatic amine, optionally in the presence of a phase transfer catalyst, or N-halogen aryl sulphonamidate is reacted with carbon monoxide in the presence of a carbonylating catalyst, and optionally in the presence of a phase transfer catalyst, then the obtained reaction mixture is further reacted with an aromatic amine or an N-halogen-arylamine-alkali metal salt is reacted with aryl-sulphonamid in the presence of a carbonylating catalyst, carbon monoxide and optionally …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.