Synthesis of 2,9-dihydropyrano[2,3-b]-indoles via intramolecular oxa-6π-electrocyclization reaction from synthesized 3-allylideneindolin-2-one intermediates
作者:Parisa Abbasi Varnakesh、Javad Azizian
DOI:10.1007/s11696-024-03427-0
日期:——
Intramolecular oxa-6π-electrocyclization reaction are described for 3-allylideneindolin-2-one derivatives in the presence of easily prepared B(HSO4)3 catalyst and their conversion to 2,9-dihydropyrano[2,3-b]-indoles in up to 72% yield under mild condition. 3-allylideneindolin-2-one has been obtained from the reaction of isatin and 1,3-dichloropropene. Comfortable synthetic conversions of the products readily
描述了在容易制备的 B(HSO4) 3催化剂存在下 3-烯丙二氢吲哚啉-2-酮衍生物的分子内 oxa-6π-电环化反应及其在向上转化为 2,9-二氢吡喃并[2,3-b]-吲哚的反应温和条件下收率可达72%。 3-烯丙二氢吲哚啉-2-酮是由靛红与1,3-二氯丙烯反应制得。产品的舒适合成转化很容易产生药理学上有趣的众多官能团。