A highly efficient PtO2/PTSA catalyst system for the hydration of a wide array of alkynes was developed. This method proved to be compatible with a large range of functional groups and the ketone products were obtained in high yields. The scope of this methodology was also extended to the synthesis of 3-aryl-isochromenones, -indoles and -benzofurans.
InBr<sub>3</sub>-Promoted Divergent Approach to Polysubstituted Indoles and Quinolines from 2-Ethynylanilines: Switch from an Intramolecular Cyclization to an Intermolecular Dimerization by a Type of Terminal Substituent Group
Use of a 2-ethynylaniline having an alkyl or aryl group on the terminal alkyne selectively produced a variety of polyfunctionalized indole derivatives in moderate to excellent yields via indium-catalyzed intramolecular cyclization of the corresponding alkynylaniline. In contrast, employment of a substrate with a trimethylsilyl group or with no substituent group on the terminal triple bond, exclusively
Catalyzed Tandem C–N/C–C Bond Formation for the Synthesis of Tricyclic Indoles using Ir(III) Pyrazolyl-1,2,3-Triazolyl Complexes
作者:Chin Min Wong、Khuong Q. Vuong、Mark R. D. Gatus、Carol Hua、Mohan Bhadbhade、Barbara A. Messerle
DOI:10.1021/om300792b
日期:2012.11.12
C–C bond formation step. The C–N bond formation leading to the formation of indoles was found to proceed via two reaction pathways with 2-(hydroxyalk-1-ynyl)aniline substrates: (a) hydroamination and (b) hydroalkoxylation–Lewis acid mediated isomerization. Pathway (b) is likely to be the main pathway in the formation of indoles starting with 2-(hydroxyalk-1-ynyl)aniline substrates 17S, 18S, and 20S.
通过Cu(I)催化的1-炔丙基吡唑与4-取代的苯基之间的惠斯根环加成反应,制备了一系列新的吡唑基-1,2,3-三唑基N - N'双齿供体配体(2a - c,3a - d)叠氮化物。取代基的吸电子能力遵循趋势PhCH 2 < p -CH 3 Ph 1000 h –1。然而,铱(III)配合物5 - 8被发现是用于串联C-N和C-C键形成的唯一的活性催化剂,因为铑(I)配合物是不为C-C键形成的活性催化剂步。发现导致吲哚形成的C–N键的形成是通过与2-(羟基烷基-1-炔基)苯胺底物的两个反应途径进行的:(a)加氢胺化和(b)加氢烷氧基化-路易斯酸介导的异构化。途径(b)可能是从2-(羟基烷-1-炔基)苯胺底物17S,18S和20S开始形成吲哚的主要途径。
Dendrimeric and Corresponding Monometallic Iridium(III) Catalysts Bound to Carbon Nanotubes Used in Hydroamination Transformations
作者:Indrek Pernik、Antonin Desmecht、Barbara A. Messerle、Sophie Hermans、Olivier Riant
DOI:10.1002/ejic.202100380
日期:2021.9.14
nanotube-bound dendrimer and three carbon nanotube-bound monometallic complexes and their use as catalysts. The polyamidoamine third generation dendrimer used here incorporates pyrazole-triazole moieties suitable for ligating iridium(III) centres. The monometallic complexes use the same pyrazole-triazole ligands coordinated to an iridium(III) centre. All catalysts were characterized using ICP-AES and XPS
A highly efficient catalytic dearomatization of indoles via visible-light photocatalysis is presented. The common indole tethered alcohol at the N1 or C2 position reacts in a cascade fashion, providing facile access to diverse indolone scaffolds.