作者:Wolfgang Holzer、Wilfried Becker、Gernot Eller
DOI:10.1055/s-2005-872078
日期:——
A novel synthesis of substituted 6-phenylpyrano[2,3-c]pyrazol-4(1H)-ones via reaction of various 2-substituted or 2,5-disubstituted 2,4-dihydro-3H-pyrazol-3-ones with phenylpropynoyl chloride using calcium hydroxide in refluxing 1,4-dioxane is described. N-Unsubstituted representatives were obtained by treatment of 4-methoxybenzyl-protected congeners with trifluoroacetic acid.
通过各种2-取代或2,5-二取代的2,4-二氢-3H-吡唑-3-酮与以下反应合成取代的6-苯基吡喃并[2,3-c]吡唑-4(1H)-酮描述了在回流 1,4-二恶烷中使用氢氧化钙的苯丙酰氯。 N-未取代的代表通过用三氟乙酸处理4-甲氧基苄基保护的同源物获得。