作者:Vera L. M. Silva、Artur M. S. Silva、Diana C. G. A. Pinto、José A. S. Cavaleiro、José Elguero
DOI:10.1007/s00706-008-0002-9
日期:2009.1
AbstractAn efficient synthesis method for the preparation of a series of new (Z)- and (E)-3(5)-(2-hydroxyphenyl)-4-styrylpyrazoles was developed. The reaction of (Z)- and (E)-3-styrylchromones with hydrazine hydrate afforded the corresponding (Z)- and (E)-3(5)-(2-hydroxyphenyl)-4-styrylpyrazoles, except for nitro derivatives, where both (Z)- and (E)-4′-nitro-3-styrylchromones afforded (E)-3(5)-(2-hydroxyph
摘要开发了一种高效的合成方法,用于制备一系列新的(Z)-和(E)-3(5)-(2-羟苯基)-4-苯乙烯基吡唑。(Z)-和(E)-3-苯乙烯基色酮与水合肼的反应得到相应的(Z)-和(E)-3(5)-(2-羟基苯基)-4-苯乙烯基吡唑,除了硝基衍生物, (Z)-和(E)-4'-硝基-3-苯乙烯基色酮均提供(E)-3(5)-(2-羟基苯基)-4-(4-硝基苯乙烯基)吡唑。讨论了这些转化的反应机理,并通过NMR实验建立了所有产物的立体化学。 图形概要