Chiral Imidodiphosphoric Acids-Catalyzed Friedel-Crafts Reactions of Indoles/Pyrroles with 3-Hydroxy-indolyloxindoles: Enantioselective Synthesis of 3,3-Diaryloxindoles
The first enantioselective Friedel–Crafts alkylation of indoles and pyrroles with 3‐hydroxy‐3‐indolyloxindoles to access two novel types of 3,3‐diaryloxindoles catalyzed by chiral imidodiphosphoric acids has been reported. A range of quaternary carbon centered 3,3‐diaryloxindoles were synthesized in high yield (up to >99%) with excellent enantioselectivity (up to 98% ee) at low catalyst loadings (as
Intermediate-Dependent Unusual [4+3], [3+2] and Cascade Reactions of 3-Indolylmethanols: Controllable Chemodivergent and Stereoselective Synthesis of Diverse Indole Derivatives
作者:Hong-Hao Zhang、Zi-Qi Zhu、Tao Fan、Jing Liang、Feng Shi
DOI:10.1002/adsc.201501063
日期:2016.4.14
Chemodivergent and stereoselectiveconstruction of indole‐containing scaffolds, as well as synthesis of diverse indole derivatives, has long been a goal in the chemistry community. In this work, we reveal key intermediate‐dependent unusual [4+3], [3+2] and cascade reactions of 3‐indolylmethanols with Nazarov reagents, leading to controllable chemodivergent and stereoselective synthesis of diverse indole
Gallium Bromide-Promoted Dearomative Indole Insertion in 3-Indolylmethanols: Chemoselective and (<i>Z</i>/<i>E</i>)-Selective Synthesis of 3,3′-Bisindole Derivatives
作者:Cong-Shuai Wang、Tao Fan、Hong-Hao Zhang、Can Li、Yang Shen、Guang-Jian Mei、Feng Shi
DOI:10.1021/acs.joc.6b02201
日期:2016.12.2
important 3,3′-bisindole frameworkbearing an all-carbon quaternary center in high yields and excellent (Z)-selectivities (up to 99% yield, all >95:5 Z/E). The reaction pathway was suggested to include a tandem sequence of Michaeladdition/C–C bond cleavage/nucleophilic addition, wherein the strong acidity of GaBr3 played a crucial role in the key step of C–C bond cleavage. This reaction not only provides
已经建立了溴化镓(GaBr 3)促进的3-吲哚甲醇中的脱芳香吲哚插入,该化合物化学选择性地构建了生物学上重要的3,3'-双吲哚骨架,该骨架具有全碳四元中心,且具有高收率和出色的(Z)选择性(收率> 95:5 Z / E时,收率可达99%)。建议该反应途径包括迈克尔加成/ CC键裂解/亲核加成的串联序列,其中GaBr 3的强酸性在CC键断裂的关键步骤中起着至关重要的作用。该反应不仅为吲哚的脱芳香化提供了新的策略,而且代表了3-吲哚基甲醇的新反应类别,该反应涉及很少报道的3-吲哚基甲醇衍生物的后期C-C键裂解。另外,该方法还提供了用于合成生物学上重要的3,3′-双吲哚衍生物的有效方法。
The first synthesis of cis-N,N′-dialkylisoindigo derivatives from 3-indolyl-2-oxindoles with DDQ
作者:Da Young Seo、Hwa Jung Roh、Hwi Yul Jo、Sung Cho、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2018.01.079
日期:2018.3
cis-N,N′-Dialkylisoindigo derivatives were synthesized for the first time by the reaction of 3-indolyl-2-oxindoles with DDQ in aqueous 1,4-dioxane. cis-Isoindigo derivatives were completely isomerized to the corresponding trans-isomers by heating the solution in short time.