Synthesis and stereochemical investigation of highly functionalized novel dispirobisoxindole derivatives via [3+2] cycloaddition reaction in ionic liquid
作者:Anshu Dandia、Anuj K. Jain、Ashok K. Laxkar、Dharmendra S. Bhati
DOI:10.1016/j.tet.2012.12.021
日期:2013.2
is studied with azomethine ylide generated in situ from decarboxylative condensation of isatin and sarcosine or proline yielding stereochemically different novel dispirobisoxindole derivatives with creation of up to four stereogenic centers through [3+2] cycloaddition reaction. Investigating the reaction with azomethine ylide of sarcosine, E isomer of alkyl 2-cyano-2-(2-oxoindolin-3-ylidene)acetate
的反应性模式ë / ž异构化(polaraziableÇ C键)烷基2-氰基-2-乙酸酯研究了产生的偶氮甲碱内鎓盐(2- oxoindolin -3-亚基)在原位从靛红和肌氨酸或脯氨酸立体化学产生的脱羧缩合通过[3 + 2]环加成反应产生多达四个立体异构中心的新型二螺双氧杂吲哚衍生物。为了研究与肌氨酸的偶氮甲叶立德的反应,2-氰基-2-(2-氧代吲哚-3-甲叉基)乙酸烷基酯的E异构体作为双极亲油性参与生产双螺并吡咯烷-双ox吲哚,而对于脯氨酸的偶氮甲ine基内鎓盐则为Z2-氰基-2-(2-氧代吲哚-3-亚烷基)乙酸烷基酯的异构体参与在[bmim] BF 4离子液体中作为单一产物生成双螺并吡咯烷二氮杂双酚类,作为环境友好的溶剂,无需使用任何催化剂即可获得优异的收率。良好的官能团耐受性和可用底物的广泛范围是具有高度化学,区域和立体选择性的本方法的其他突出特征。两种类型的环加合物的结构和相对立体化学均通过单晶X射线衍射以及1