- Process for the preparation of derivatives of 1-substituted-3-fluoroalkyl-pyrazole-4-carboxylic acid in the presence of ammonium salt
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A process for the manufacture of a compound of the general formula (I) wherein - Y is H, F, an alkyl group, a cycloalkyl group, an aralkyl group or an aryl group, - R1 is H or an organic residue, - R2 is H or an organic residue ; which comprises submitting a compound of formula (II) wherein Y is as defined above, R1, is H or an organic residue, R2, is H or an organic residue, X is Cl, Br, I, CN, sulphate or sulphonate ; to a reduction reaction in the presence of an ammonium salt.
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Paragraph 0049; 0050
(2014/02/15)
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- A one-pot process for the regioselective synthesis of 1,3,4-trisubstituted-1H-pyrazoles
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This Letter reports a facile and regioselective one-pot synthesis of 1,3,4-trisubstituted-1H-pyrazoles. It comprises a three-step telescoped sequence, which has been utilised in the production of a variety of differentially substituted pyrazoles.
- Raw, Steven A.,Turner, Andrew T.
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experimental part
p. 696 - 699
(2011/02/27)
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