Regioselective Synthesis of Unsymmetrical 3,5-Dialkyl-1-arylpyrazoles
作者:Xiao-jun Wang、Jonathan Tan、Li Zhang
DOI:10.1021/ol0001822
日期:2000.10.1
3-Alkoxylmethyl-5-alkylpyrazoles undergo regioselective N-arylation with 4-fluoronitrobenzene in the presence of base to yield the corresponding 1-(4-nitro-phenyl)pyrazoles. Further elaboration of these intermediates furnishes a practical synthesis of unsymmetrical 3,5-dialkyl-1-arypyrazoles. A tentative explanation of the observed regioselectivities is provided.