Process for producing sulfonylureas
US4656273A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 16, 1985 |
| Grant date | Apr 7, 1987 |
| Priority date | — |
| Expiry date | Dec 16, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D411/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There is described a novel process for producing sulfonylureas of formula I ##STR1## wherein R.sub.1 is hydrogen or alkyl, PA0 R.sub.2 is ##STR2## E is .dbd.N-- or .dbd.CH--, R.sub.3 is alkyl, alkoxy or halogen, PA0 R.sub.4 is alkyl, cycloalkyl, alkoxy, halogen, alkoxy-alkyl, halo-alkyl or halo-alkoxy, PA0 R.sub.5 is hydrogen or alkyl, PA0 T is a substituted phenyl group ##STR3## Y is hydrogen or halogen, X is hydrogen, halogen, alkyl, halo-alkyl, alkenyl, halo-alkenyl, alkynyl, alkoxy, halo-alkoxy, alkylthio, alkylsulfinyl, alkylsulfonyl, halo-alkylthio, alkylsulfonyloxy, phenylsulfonyloxy, phenylsulfonyloxy mono- or polysubstituted by alkyl, or is di-alkylsulfamoyl, and PA0 A is a bridge member which has 3 or 4 atoms and which contains 1 or 2 hetero atoms, selected from the group consisting of oxygen, sulfur and nitrogen, the said process comprising reacting a silfonamide of the formula II EQU T--SO.sub.2 --NH.sub.2 (II), in the presence of a base, with diphenyl carbonate to form a salt of a phenyl carbamate converting this salt into the free phenyl carbamate and reacting this further with an amine. Sulfonylureas are herbicidally effective compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.