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US09359304B2 Process for the preparation of 3-haloalkylpyrazoles 有权
3-卤代烷基吡唑的制备方法

Process for the preparation of 3-haloalkylpyrazoles
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.
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