Cu/TEMPO catalyzed dehydrogenative 1,3-dipolar cycloaddition in the synthesis of spirooxindoles as potential antidiabetic agents
作者:Chitrala Teja、Spoorthy N. Babu、Ayesha Noor、J. Arul Daniel、S. Asha Devi、Fazlur Rahman Nawaz Khan
DOI:10.1039/d0ra01553a
日期:——
dehydrogenation of alkylated ketones, 1 followed by 1,3-dipolar cycloaddition of azomethine ylides via decarboxylative condensation of isatin, 2 and L-proline/sarcosine, 3 in high regioselectivities and yields. The detailed mechanistic studies were performed to identify the reaction intermediates, which revealed that the reaction proceeds via dehydrogenative cycloaddition. Additionally, the regio and stereochemistry
通过 Cu-TEMPO 催化烷基化酮脱氢,依次合成了一系列螺-[二氢吲哚-3,3'-吡咯嗪/吡咯烷]-2-酮,4、5 和 6,1随后是1,3-通过靛红, 2和L-脯氨酸/肌氨酸, 3的脱羧缩合,实现偶氮甲碱叶立德的偶极环加成,具有高区域选择性和产率。进行了详细的机理研究以确定反应中间体,结果表明该反应是通过脱氢环加成进行的。此外,合成衍生物的区域和立体化学通过二维核磁共振波谱研究得到了证实。通过分子对接、体外抗氧化和抗糖尿病活性进一步探索了合成的衍生物。