406920-63-6Relevant academic research and scientific papers
Mapping the Surface Groups of Amine-Rich Carbon Dots Enables Covalent Catalysis in Aqueous Media
Amato, Francesco,Bonchio, Marcella,Companyó, Xavier,Dell'Amico, Luca,Filippini, Giacomo,Prato, Maurizio,Ragazzon, Giulio,Rosso, Cristian,Vega-Pe?aloza, Alberto
supporting information, p. 3022 - 3037 (2020/11/03)
Carbon nanodots stand as the missing link between the molecular and the nanoscale world, owing to the unique molecular-like behavior emerging from their synthetic precursors. A converging set of analytical and spectroscopic data yields a precise inventory
Re-Engineering Organocatalysts for Asymmetric Friedel-Crafts Alkylation of Indoles through Computational Studies
Gerosa, Gabriela G.,Marcarino, Maribel O.,Spanevello, Rolando A.,Suárez, Alejandra G.,Sarotti, Ariel M.
, p. 9969 - 9978 (2020/09/03)
The discovery of efficient organocatalysts is generally carried out by thorough experimental screening of different candidates. We recently reported an efficient organocatalyst for iminium-ion-based asymmetric Diels-Alder reactions following a rational design approach. This result encouraged us to test this optimal catalyst in the mechanistically related Friedel-Crafts alkylation of indoles, but to our surprise, almost null enantioselectivity was observed. The results did not significantly improve with structurally related catalysts, and a totally unexpected facial selectivity inversion was also noticed. Using DFT calculations by modeling the competing transition structures with ONIOM, we could unravel the origins of those findings, further employed to predict the most efficient catalyst for this new transformation. The computational results were validated experimentally (up to 92:8 er), providing another successful example of a general strategy to accelerate catalyst development which still remains underexplored.
Alkyne Hydroheteroarylation: Enantioselective Coupling of Indoles and Alkynes via Rh-Hydride Catalysis
Cruz, Faben A.,Zhu, Yamin,Tercenio, Quentin D.,Shen, Zengming,Dong, Vy M.
, p. 10641 - 10644 (2017/08/15)
We report an enantioselective coupling between alkynes and indoles. A Rh-hydride catalyst isomerizes alkynes to generate a metal-allyl species that can be trapped with both aromatic and heteroaromatic nucleophiles.
Polystyrene or Magnetic Nanoparticles as Support in Enantioselective Organocatalysis? A Case Study in Friedel-Crafts Chemistry
Ranjbar, Sara,Riente, Paola,Rodríguez-Escrich, Carles,Yadav, Jagjit,Ramineni, Kishore,Pericàs, Miquel A.
supporting information, p. 1602 - 1605 (2016/05/02)
Heterogenized versions of the second-generation MacMillan imidazolidin-4-one are described for the first time. This versatile organocatalyst has been supported on 1% DVB Merrifield resin and Fe3O4 magnetic nanoparticles through a copper-catalyzed alkyne-azide cycloaddition (CuAAC) reaction. The resulting catalytic materials have been successfully applied to the asymmetric Friedel-Crafts alkylation of indoles with α,β-unsaturated aldehydes. While both catalytic systems can be easily recovered and admit repeated recycling, the polystyrene-based catalyst shows higher stability and provides better stereoselectivities.
Hydrogen-bond-mediated supramolecular iminium ion catalysis
Wang, Yao,Yu, Tian-Yang,Zhang, Hong-Bo,Luo, Yong-Chun,Xu, Peng-Fei
supporting information, p. 12339 - 12342 (2013/02/23)
Mod squad: Multiple small molecules appear to spontaneously self-assemble to form supramolecular amine catalysts that have high reactivity, good efficiency, and enhanced turnover numbers. These modular organocatalysts should be applicable to many iminium as well as hydrogen-bond catalytic reactions and provide new insights into asymmetric catalysis. Copyright
Highly stereoselective imidazolethiones mediated Friedel-Crafts alkylation of indole derivatives
Liang, Xianrui,Li, Shuangmin,Su, Weike
supporting information; experimental part, p. 289 - 291 (2012/01/31)
The asymmetric Friedel-Crafts alkylation of indoles with α,β-unsaturated aldehydes was promoted by the novel imidazolethiones to afford the corresponding adducts in moderate to excellent yields and high enantioselectivities under mild reaction conditions.
Autocatalysis and organocatalysis with synthetic structures
Kamioka, Seiji,Ajami, Dariush,Rebek Jr., Julius
experimental part, p. 541 - 544 (2010/09/16)
The discovery of ribozymes led to the proposal of an RNA world, where a single type of molecule was supposedly capable of selfreplication and chemical catalysis. We show here that both autocatalysis and organocatalysis can be engineered into a synthetic structure. The compound is shown to selectively accelerate its own formation and catalyze either hydrogenation or nucleophilic addition to α,β-unsaturated aldehydes. The observed reactivity indicates that the components of a purported pre-RNA world conceivably include smaller organic molecules. imidazolidinone catalysis self-replication template effects.
Enantioselective friedel-crafts alkylation of indoles with aromatic αβ-unsaturated aldehydes catalyzed by diphenylprolinol silyl Ether
Wang, Zhi-Jing,Yang, Jian-Guo,Jin, Jun,Lv, Xin,Bao, Weiliang
scheme or table, p. 3994 - 4000 (2010/03/24)
A catalytic enantioselective Friedel-Crafts alkylation of indoles with aromatic α,β-unsaturated aldehydes has been developed. The process is promoted by (S)-diphenylprolinol trimethyl silyl ether to afford, after sodium borohydride mediated reduction, 3in
Aziridin-2-yl methanols as organocatalysts in Diels-Alder reactions and Friedel-Crafts alkylations of N-methyl-pyrrole and N-methyl-indole
Bonini, Bianca F.,Capito, Elena,Comes-Franchini, Mauro,Fochi, Mariafrancesca,Ricci, Alfredo,Zwanenburg, Binne
, p. 3135 - 3143 (2007/10/03)
A series of enantiomerically pure aziridin-2-yl methanols have been synthesized from aziridine-2-carboxylic esters and have been tested as organocatalysts in Diels-Alder reactions and Friedel-Crafts alkylations of N-methyl-pyrrole and N-methyl-indole usin
Controllable Enantioselective Friedel-Crafts Reaction between Indoles and Alkylidene Malonates Catalyzed by Pseudo-C3-Symmetric Trisoxazoline Copper(II) Complexes
Zhou, Jian,Ye, Meng-Chun,Huang, Zheng-Zheng,Tang, Yong
, p. 1309 - 1320 (2007/10/03)
Pseudo-C3-symmetric trisoxazoline copper(II) complexes prove to be excellent catalysts in the Friedel-Crafts alkylation of indoles with alkylidene malonates. The absolute stereochemistry of this reaction is shown to be dependent on the solvent.
