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US 2020/0048234 A1Published application
Method for preparing methyl 4-[(4,5-dihydro-3-methoxy-4-methyl-5-oxo-1h-1,2,4-triazol-1-yl)carbonyl)sulfamoyl]-5-methylthiophene-3-carboxylate
AssigneesBayer CropScience AG, Bayer Aktiengesellschaft
InventorsSergii PAZENOK, Christian FUNKE, Friedrich August MUEHLTHAU, Mark James FORD, Arnd NEEFF, Klaus-Ulrich SCHIFFER
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Abstract
The invention relates to a method for preparing methyl 4-[(4,5-dihydro-3-methoxy-4-methyl-5-oxo-1H-1,2,4-triazol-1-yl)carbonyl)sulfamoyl]-5-methylthiophene-3-carboxylate from 4-methoxycarbonyl-2-methylthiophene-3-sulfonyl chloride in the presence of an imidazole base substituted in the 1-position or in the presence of a mixture of bases comprising an imidazole base substituted in the 1-position (N-alkylimidazole).
Claims15
A method for preparing a compound of formula (I)
- by reacting the compound of formula (II)
- with a metal cyanate of formula (III)
- MeOCN (III),
- where Me is Li, Na, K or Cs
- and
- with a compound of formula (IV)
- wherein the reaction is carried out in the presence of an imidazole of formula (V)
- where the radical R1 is an unsubstituted (C1-C12)-alkyl or an unsubstituted benzyl.
5 more elements
Dependencies are inferred from the claim text.