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。
Simultaneous Functionalization of Carbon Surfaces with Rhodium and Iridium Organometallic Complexes: Hybrid Bimetallic Catalysts for Hydroamination
作者:Samantha C. Binding、Indrek Pernik、Vinicius R. Gonçales、Chin M. Wong、Richard F. Webster、Soshan Cheong、Richard D. Tilley、Alfonso E. Garcia-Bennett、J. Justin Gooding、Barbara A. Messerle
DOI:10.1021/acs.organomet.8b00726
日期:2019.2.25
absorption. The qualitative distribution of rhodium and iridium ions on the carbon surfaces was determined by STEM-EDX, revealing a uniform distribution of both complexes on the carbon surfaces. The efficiency of the materials as catalysts for intramolecular hydroamination was investigated. The data acquired demonstrated that the optimized ratio of rhodium and iridium on the carbon black material led to more
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