Process for the synthesis of 1,4-disubstituted pyrazoles

Details Process for the synthesis of 1,4-disubstituted pyrazoles Process for the synthesis of 1,4-disubstituted pyrazoles

1992-07-20

1993-03-02

Ramsuer, Robert W.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

5483771, C07D23112

Patent

active

051910870

ABSTRACT:
The present invention relates to a process for the synthesis of 1,4-disubstituted pyrazoles. A monosubstituted hydrazine is reacted with the product of reaction of an acetal with an N-substituted halomethyliminium salt, preferably N,N-dimethylchloromethyliminium chloride.
The 1,4-disubstituted pyrazoles are, in particular, important intermediates in the synthesis of herbicides or drugs.

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