Rhodium(III)-Catalyzed Dehydrogenative Annulation and Spirocyclization of 2-Arylindoles and 2-(1<i>H</i>-Pyrazol-1-yl)-1<i>H</i>-indoles with Maleimides: A Facile Access to Isogranulatimide Alkaloid Analogues
作者:Vikki N. Shinde、Krishnan Rangan、Dalip Kumar、Anil Kumar
DOI:10.1021/acs.joc.0c02467
日期:2021.2.5
A Rh(III)-catalyzed dehydrogenative annulation and spirocyclization of 2-arylindoles and 2-(1H-pyrazol-1-yl)-1H-indole with maleimides is described. The cascade protocol provided highly functionalized benzo[a]pyrrolo[3,4-c]carbazole-1,3(2H,8H)-diones and spiro[isoindolo[2,1-a]indole-6,3′-pyrrolidine]-2′,5′-diones in good to excellent. The developed reaction methodology exhibited broad substrate scope
描述了Rh(III)催化的2-芳基吲哚和2-(1H-吡唑-1-基)-1H-吲哚与马来酰亚胺的脱氢环化和螺环化。级联方案提供了高度官能化的苯并[ a ]吡咯并[3,4- c ]咔唑-1,3(2 H,8 H)-二酮和螺[异吲哚并[ 2,1- a ]吲哚-6,3'-吡咯烷] -2',5'-二烯良好。发达的反应方法具有广泛的底物范围和良好的官能团耐受性,并且操作简单且可扩展。研究了环状产物的光物理性质。2-(1 H-吡唑-1-基)-1 H的环状产物与2-苯基吲哚相比,-吲哚显示出高的吸收和发射值,并且具有大的红移。
Palladium-Catalyzed Tandem Regioselective Oxidative Coupling from Indoles and Maleimides: One-Pot Synthesis of Indolopyrrolocarbazoles and Related Indolylmaleimides
8-diones has been developed from both free and protected (NH) indoles and maleimides via a regioselective tandem oxidative coupling reaction. The yields are moderate to excellent. In addition, 2-substitutedindoles are suitable substrates in this protocol, leading to the formation of indolylmaleimides. The present methodology provides a concise route to highly functionalized indolopyrrolocarbazole derivatives
从游离和受保护的(吲哚)吲哚和二氢吲哚都开发了一种有效的Pd(II)催化方法,用于直接合成吲哚并[3,2- a ]吡咯并[3,4- c ]咔唑-6,8-二酮。通过区域选择性串联氧化偶联反应进行马来酰亚胺。产量中等至极好。另外,在该方案中2-取代的吲哚是合适的底物,导致吲哚基马来酰亚胺的形成。本方法学提供了高度官能化的吲哚并吡咯并咔唑衍生物的简洁途径。
A novel synthesis of arcyriaflavin-A
作者:A.Paulo Fonseca、Ana M Lobo、Sundaresan Prabhakar
DOI:10.1016/0040-4039(95)00363-h
日期:1995.4
2,3-Bis [3'-indolylmercapto]maleimide on treatment with PdCl2 affords arcyriaf