Ligand-Controlled Selectivity in the Pd-Catalyzed C–H/C–H Cross-Coupling of Indoles with Molecular Oxygen
作者:Igor Beckers、Besir Krasniqi、Prashant Kumar、Daniel Escudero、Dirk De Vos
DOI:10.1021/acscatal.0c04893
日期:2021.2.19
the selective C–H/C–H cross-coupling of N-substituted indoles without directing groups, driven by molecular oxygen under mild conditions. The selectivity of the C–H activations was studied via kinetic experiments and computational investigations. A quantitative Hammett study of the aromatic carboxylate ligands shows that regioselectivity can be directed by rationally tuning their electronic properties
Rhodium(III)‐Catalyzed Regioselective C−H Allylation and Prenylation of Indoles at C4‐Position
作者:Shang‐Shi Zhang、Yan‐Zhi Liu、Yi‐Chuan Zheng、Hui Xie、Shao‐Yong Chen、Jia‐Lin Song、Bing Shu
DOI:10.1002/adsc.202100882
日期:2022.1.4
Herein, Rh(III)-catalyzed C4-selective C−H allylation and prenylation of indoles by using a weak carbonyl coordination directing group have been reported. By employing 5-methylene-1,3-dioxan-2-ones, 4-vinyl-1,3-dioxolan-2-ones and 2-methyl-2,3-butadiene as scalable cross-coupling partners, these divergent synthesis protocols proceed smoothly under redox-neutral reaction conditions, delivering various
Cascade of C(sp<sup>2</sup>)–H Addition to Carbonyl and C(sp<sup>2</sup>)–CN/C(sp<sup>2</sup>)–H Coupling Enabled by Brønsted Acid: Construction of Benzo[<i>a</i>]carbazole Frameworks
作者:Ling Tang、Shuangshuang Jiang、Xinmiao Huang、Zhiyong Song、Jian-bo Wang、Ming Ma、Bo Chen、Yuanhong Ma
DOI:10.1021/acs.orglett.2c01027
日期:2022.5.6
C(sp2)–H addition to carbonyl and the C(sp2)–CN/C(sp2)–H coupling of 2-(2-oxo-2-arylethyl)benzonitriles with indoles enabled by commercially available TsOH·H2O. The protocol represents the first metal-free C(sp2)–CN/C(sp2)–H coupling, affording a new route for the synthesis of various benzo[a]carbazole derivatives with a broad substrate scope, highyields, and simple conditions.
unprecedented three-component [2 + 2 + 1] annulation cascade of indoles with aryldiazonium salts and polyhalomethanes or acetone is presented by dual hydrogen atom transfer (HAT) and C–H functionalization. By employing readily accessible aryldiazonium salts as the radical initiators and electrophiles and polyhalomethanes and acetone as the C1 units, this method unprecedentedly constructs a pyrazole ring on an
The indole-substituted trifluoromethyl sulfonium ylide has been developed via Cp*Rh(III)-catalyzed diazo-carbenoid addition to trifluoromethylthioether and is the first example of an Rh(III)-catalyzed diazo-carbenoid addition reaction with trifluoromethylthioether. Several kinds of indole-substituted trifluoromethyl sulfonium ylide were constructed under mild reaction conditions. The reported method
吲哚取代的三氟甲基硫叶立德是通过 Cp*Rh(III) 催化的重氮基类胡萝卜素与三氟甲基硫醚的加成反应开发的,是 Rh(III) 催化的重氮基类胡萝卜素与三氟甲基硫醚的加成反应的第一个例子。在温和的反应条件下构建了几种吲哚取代的三氟甲基硫叶立德。所报道的方法表现出高官能团相容性和广泛的底物范围。此外,该协议被发现与 Rh (II) 催化剂公开的方法互补。