reaction of 4-arylidene-3H-pyrazol-3-one 1 with secondary and tertiary carbanionsderivedfrom a methylene and methine group bearing both a leaving group and electron-withdrawing group, e.g. methyl chloroacetate, ethyl chloroacetate, isopropyl chloroacetate, tert-butyl chloroacetate, chloroacetonitrile, 2-chloro-N,N-diethylacetamide, methyl 2-chloropropionate and 2-chloropropionitrile, in the presence of
investigation of synthesis and biologically active compounds of pyrazole derivatives containing transition metal, several newpyrazolecopper(II) complexes 3a−f were synthesized from pyrazole sodium salts 2a−f, which were produced from spiro‐pyrazoles 1a−f and sodium hydride by a ring‐opening reaction. All the synthesized compounds were characterized by spectroscopic analysis. Pyrazolecopper(II) complexes 3a−d
Chemical reactivity and application of 4-alkylidene-3H-pyrazol-3ones are described. Furthermore, twelve of the newly synthesized O-substituted pyrazoles were evaluated for their antifungal activity in vitro against Candida albicans and Saccharomyces cerevisiae.
Ring transformation of spirocyclopropanepyrazoles into pyrano[2,3-<i>c</i>]pyrazoles
An approach to pyrano[2,3-c]pyrazoles starting from spirocyclopropanepyrazoles via a ring-opening/cyanomethylation and intramolecular cyclization is described. Reactions of spirocyclopropanepyrazoles with chloroacetonitrile in the presence of sodium hydride gave the corresponding cyanomethoxypyrazoles . Treatment of with sodium hydride at room temperature caused intramolecular Michael addition reaction
描述了一种通过开环/氰基甲基化和分子内环化从螺环丙烷吡唑开始制备吡喃并[2,3- c ]吡唑的方法。螺环丙烷吡唑的反应 在氢化钠存在下用氯乙腈制得相应的氰基甲氧基吡唑类 。治疗与氢化钠在室温下引起分子内迈克尔加成反应,得到相应的吡喃并[2,3- c ]吡唑。J.杂环化学,(2009)。