Enantioselective Synthesis of 2-Amino-1,1-diarylalkanes Bearing a Carbocyclic Ring Substituted Indole through Asymmetric Catalytic Reaction of Hydroxyindoles with Nitroalkenes
作者:Carlos Vila、Jaume Rostoll-Berenguer、Rubén Sánchez-García、Gonzalo Blay、Isabel Fernández、M. Carmen Muñoz、José R. Pedro
DOI:10.1021/acs.joc.8b00612
日期:2018.6.15
An asymmetric catalytic reaction of hydroxyindoles with nitroalkenes leading to the Friedel–Crafts alkylation in the carbocyclic ring of indole is presented. The method is based on the activating/directing effects of the hydroxy group situated in the carbocyclic ring of the indole providing nitroalkylated indoles functionalizated at the C-4, C-5, and C-7 positions with high yield, regio-, and enantioselectivity
Temperature Dual Enantioselective Control in a Rhodium-Catalyzed Michael-Type Friedel-Crafts Reaction: A Mechanistic Explanation
作者:Isabel Méndez、Ricardo Rodríguez、Víctor Polo、Vincenzo Passarelli、Fernando J. Lahoz、Pilar García-Orduña、Daniel Carmona
DOI:10.1002/chem.201601301
日期:2016.7.25
enantiomer of the Friedel–Crafts (FC) adduct of the reaction between N‐methyl‐2‐methylindole and trans‐β‐nitrostyrene can be obtained by using (SRh,RC)‐[(η5‐C5Me5)Rh(R)‐Prophos}(H2O)][SbF6]2 as the catalyst precursor. This catalytic system presents two other uncommon features: 1) The ee changes with reaction time showing trends that depend on the reaction temperature and 2) an increase in the catalyst
Electrostatically Enhanced Phosphoric Acids and Their Applications in Asymmetric Friedel–Crafts Alkylations
作者:Jie Ma、Steven R. Kass
DOI:10.1021/acs.joc.9b01741
日期:2019.9.6
series of electrostatically enhanced phosphoric acid catalysts were synthesized and studied. These compounds possess two positively charged N-octylpyridinium or triarylphosphonium ion centers at the 3,3′-positions of the (R)-BINOL backbone to enhance reactivity and provide needed steric bulk for enantioselective transformations. Catalytic activities for Friedel–Crafts alkylations of indoles with trans-β-nitrostyrenes
Immobilization of Diphenylamine-Linked Bis(oxazoline) Ligands and Their Application in the Asymmetric Friedel-Crafts Alkylation of Indole Derivatives with Nitroalkenes
作者:Han Liu、Da-Ming Du
DOI:10.1002/ejoc.200901434
日期:2010.4
A diphenylamine-linkedbis(oxazoline) ligand with trans-diphenyl substitution on the oxazoline rings has been immobilized onto one- to three-generation Frechet-type dendrimers and a C 3 -symmetric core structure. The catalytic activities and enantioselectivities of these new ligands were tested in the asymmetricFriedel-Craftsalkylation reactions of indolederivatives with nitroalkenes. The two types
Enhanced Efficiency of Thiourea Catalysts by External Brønsted Acids in the Friedel-Crafts Alkylation of Indoles
作者:Eugenia Marqués-López、Ana Alcaine、Tomás Tejero、Raquel P. Herrera
DOI:10.1002/ejoc.201100506
日期:2011.7
We thank the Ministry of Science and Innovation (MICINN), Madrid, Spain (Project CTQ2010-19606), and the Government of Aragon, Zaragoza, Spain (Project PI064/09 and Research Groups, E-10), for financial support of our research. E.M.-L. thanks CSIC for a JAE-Doc postdoctoral contract.