Patent · US Active

Process for the regioselective synthesis of pyrazoles

US9676726B2 · kind B2 · utility

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15Claims

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Assignee

ISAGRO S.P.A. · IT

Inventors

Giovanni Meazza · Saronno, IT
Laura SILLANI · Borgomanero, IT
Pierangelo MEREGHETTI · Busto Garolfo, IT
Daniele FORGIA · Novara, IT

Key dates

Filing date	Dec 23, 2014
Grant date	Jun 13, 2017
Priority date	—
Expiry date	Dec 23, 2034

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C243/28
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process is described for the synthesis of pyrazoles having general formula (I)which comprises the steps of mixing a compound having general formula (II)and a 1,2-disubstituted hydrazine having general formula (III)to form a reaction intermediate having general formula (IV)and the reaction mixture obtained in step i), in an acid environment, cyclizes to form a pyrazole having general formula (I), according to reaction scheme 1

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.