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2005
Pyrazole derivatives
R 0180
A General and Facile Synthesis of 1,3-Diaryl-4-pyrazoleacetic Acid Esters. —
method for the synthesis of 1,3-diaryl-4-pyrazoleacetic acid esters of type (III) is
27- 125 A
described. Bulky esters (i.e. isopropylesters) have to be applied for the formation of the
hydrazones from electron-rich arylhydrazines used as starting compounds of type (I).
Otherwise cyclization becomes the predominant pathway as shown by the formation of
(VII). — (XU, D. D.; LEE, G. T.; JIANG, X.; PRASAD*, K.; REPIC, O.;
BLACKLOCK, T. J.; J. Heterocycl. Chem. 42 (2005) 1, 131-135; Chem. Anal. Dev.,
Novartis Inst. Biomed. Res., East Hanover, NJ 07936, USA; Eng.) — M. Bohle
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