Here we summarise our results for SmI2-induced 5-exo-trig to 8-exo-trig reductive cyclisations of suitably substituted indole and pyrrole derivatives. All precursors were easily prepared by simple N-alkylation or N-acylation of indole and pyrrole derivatives with the corresponding iodo alkanones, acid chlorides or lactones. The SmI2-induced cyclisations in most cases provided tri- and tetracyclic derivatives
Manganese(<scp>iii</scp>)-promoted tandem phosphinoylation/cyclization of 2-arylindoles/2-arylbenzimidazoles with disubstituted phosphine oxides
作者:Shuai-Shuai Jiang、Yu-Ting Xiao、Yan-Chen Wu、Shu-Zheng Luo、Ren-Jie Song、Jin-Heng Li
DOI:10.1039/d0ob00877j
日期:——
1-a]isoquinolin-6(5H)-ones through manganese(III)-promoted tandem phosphinoylation/cyclization of 2-arylindoles or 2-arylbenzimidazoles with disubstituted phosphineoxides was developed. In this transformation, new C–P bond and C–C bond were constructed simultaneously under silver-free conditions, exhibiting a broad substrate scope. It was noted that not only diarylphosphine oxides but also dialkyl and arylalkyl-phosphine
一种简单实用的方法,通过锰合成磷酸取代的吲哚[2,1 - a ]异喹啉-6(5 H)-和苯并咪唑[2,1 - a ]异喹啉-6(5 H)-。III)促进了双芳基膦酸酯或2-芳基苯并咪唑与双取代氧化膦的串联膦酰基化/环化反应。在这种转变中,在无银条件下同时构建了新的C–P键和C–C键,具有广泛的底物范围。注意到不仅二芳基膦氧化物,而且二烷基和芳基烷基膦氧化物也符合条件。
Synthesis of indolo[2,1-<i>a</i>]isoquinoline derivatives <i>via</i> visible-light-induced radical cascade cyclization reactions
We describe a photocatalyzed transformation for the synthesis of the indolo[2,1-a]isoquinoline core structure. This redox neutral reaction features mild reaction conditions and exceptional functional group tolerance. A series of valuable indolo[2,1-a]isoquinoline derivatives bearing various functional groups were synthesized using this method in good to excellent yields.
我们描述了吲哚[2,1- a ]异喹啉核心结构的合成的光催化转化。该氧化还原中性反应具有温和的反应条件和出色的官能团耐受性。使用该方法以良好至优异的产率合成了一系列带有各种官能团的有价值的吲哚[2,1- a ]异喹啉衍生物。
Rh(III)-Catalyzed C–H Cyclization of Arylnitrones with Diazo Compounds: Access to 3-Carboxylate Substituted<i>N</i>-Hydroxyindoles
作者:Yazhou Li、Jian Li、Xiaowei Wu、Yu Zhou、Hong Liu
DOI:10.1021/acs.joc.7b01393
日期:2017.9.1
Recently, N-hydroxyindole derivatives have received much interest because of their unique structural motif and various biological activities. In this study, we report the first example of a Rh(III)-catalyzed reaction of arylnitrones with α-diazoketoesters or α-diazodiketones to produce N-hydroxyindole derivatives. Intriguingly, we could build the N-hydroxyindole scaffold by blocking the cleavage of
Regioselective Synthesis of Indoles via Reductive Annulation of Nitrosoaromatics with Alkynes
作者:Andrea Penoni、Jerome Volkmann、Kenneth M. Nicholas
DOI:10.1021/ol017139e
日期:2002.3.1
[reaction: see text] Indoles are produced regioselectively and in moderate yields by two new processes: (a) from the [CpRu(CO)2]2-catalyzed reaction of nitrosoaromatics (ArNO) with alkynes under carbon monoxide and (b) in a two-step sequence involving the (uncatalyzed) reaction of ArNO with alkynes, followed by reduction of the intermediate adduct.