首页> 外文期刊>Chemistry: A European journal >Asymmetric, Three-Component, One-Pot Synthesis of Spiropyrazolones and 2,5-Chromenediones from Aldol Condensation/NHC-Catalyzed Annulation Reactions
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Asymmetric, Three-Component, One-Pot Synthesis of Spiropyrazolones and 2,5-Chromenediones from Aldol Condensation/NHC-Catalyzed Annulation Reactions

机译:醛醇缩合/ NHC催化环化反应合成螺旋吡唑啉酮和2,5-铬二酮的不对称三组分一锅法

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摘要

A novel one-pot, three-component diastereo- and enantioselective synthesis of spiropyrazolones has been developed involving the aldol condensation of an enal to generate ,-unsaturated pyrazolones, which react with a second equivalent of enal through an N-heterocyclic carbene (NHC)-catalyzed [3+2] annulation. The desired spirocyclopentane pyrazolones are obtained in moderate to good yields and good to excellent stereoselectivities. Alternatively, starting from cyclic 1,3-diketones, 2,5-chromenediones are available through [2+4] annulation.
机译:已开发出一种新颖的一锅,三组分非对映体和对映体选择性的螺并吡唑酮合成方法,该方法包括将烯醛进行羟醛缩合反应生成不饱和吡唑酮,后者通过N-杂环卡宾与第二当量的烯醛反应。催化的[3 + 2]环空。所需的螺环戊烷吡唑啉酮以中等至良好的产率和良好至优异的立体选择性获得。或者,从环状的1,3-二酮开始,可通过[2 + 4]环化获得2,5-铬二酮。

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