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US 2016/0244413 A1Published application
Process for the preparation of 3-haloalkylpyrazoles
AssigneeSyngenta Participations AG
InventorsLinhua WANG, Ritesh Bharat SHETH
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Abstract
The present invention provides a process for the preparation of a compound of formula I: wherein R1 is C1-C4 haloalkyl; R2 is optionally substituted alkyl, optionally substituted aryl or optionally substituted heteroaryl; and R3 is methyl or ethyl; comprising reacting a compound of formula IV: wherein R1, R2 and R3 are as defined for the compound of formula I; with an alkylating agent in the presence of an amide.
Claims5
A process for the preparation of a compound of formula I:
- wherein R1 is C1-C4 haloalkyl;
- R2 is optionally substituted alkyl, optionally substituted aryl or optionally substituted heteroaryl;
- and
- R3 is methyl or ethyl;
- comprising
- b1. reacting a compound of formula II:
- wherein R1 and R2 are as defined for the compound of formula I;
- with an alkylating agent to produce a mixture comprising a compound of formula I and a compound of formula IV
- wherein R1, R2 and R3 are as defined for the compound of formula I;
- and
- b2. reacting the mixture from b1. with an alkylating agent in the presence of an amide.
8 more elements
Dependencies are inferred from the claim text.