consecutive three-component activation–alkynylation–cyclization reaction of (hetero)aryl glyoxylic acids, oxalyl chloride, arylacetylenes, and hydrazides efficiently forms 1,5-diacyl-5-hydroxypyrazolines in moderate to good yields. The structures were unambiguously corroborated by comprehensive NMR spectroscopy and X-ray structure analyses of selected derivatives.
(杂)芳基
乙醛酸,
草酰氯,芳基
乙炔和酰
肼的连续三组分活化-炔基化-环化反应可有效地形成1,5-二酰基-5-羟基
吡唑啉,产率中等至良好。通过全面的NMR光谱学和对选定衍
生物的X射线结构分析,明确证实了该结构。