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US 11,530,185 B2Granted
Method for preparing nitropyrazoles
AssigneesArianegroup SAS, Eurenco
InventorsSébastien Comte, Elsa Delmas
Life of this patent
Estimating the term…
Abstract
A process for the sigmatropic rearrangement of the compound of formula in which R3 is an NO2 group and R4 is either a hydrogen or an NO2 group, includes heat treating the compound by microwave.
Claims7
A process for preparing a compound of formula (II):
- which comprises the steps of:
- a) subjecting a compound of formula (VI) to nitration:
- to give a compound of formula (V):
- b) heat-treating by microwave the compound of formula (V), to give a compound of formula (IV):
- c) subjecting the compound of formula (IV) to nitration, to give a compound of formula (III):
- d) heat-treating by microwave the compound of formula (III), to give the compound of formula (II).
3 more elements
Dependencies are inferred from the claim text.