1908-67-4Relevant academic research and scientific papers
Gallium(III)-catalyzed three-component (4+3) cycloaddition reactions
Han, Xinping,Li, Hui,Hughes, Russell P.,Wu, Jimmy
, p. 10390 - 10393 (2012)
Direct approach to indoles: The title reaction generates cyclohepta[b]indole derivatives in a single step at room temperature (see scheme). Exclusion of air or moisture is not required. DFT calculations support a stepwise cyclization event, and the versatility of the method is demonstrated by providing quick access to a library of cyclohepta[b]indole analogues. Copyright
Lewis Acid-Catalyzed [3+3] Annulation of Donor-Acceptor Cyclopropanes and Indonyl Alcohols: One Step Synthesis of Substituted Carbazoles with Promising Photophysical Properties
Varshnaya, Rohit Kumar,Banerjee, Prabal
, p. 1614 - 1623 (2019/02/07)
A highly efficient protocol to access carbazole from donor-acceptor cyclopropane and indonyl alcohol via [3+3] annulation in the presence of a Lewis acid has been demonstrated. This method facilitates the post functionalization of the substituted carbazol
Friedel-Crafts Hydroxyalkylation of Indoles Mediated by Trimethylsilyl Trifluoromethanesulfonate
Downey, C. Wade,Poff, Christopher D.,Nizinski, Alissa N.
, p. 10364 - 10369 (2015/11/03)
Indoles and N-alkylindoles undergo Friedel-Crafts addition to aldehydes in the presence of trimethylsilyl trifluoromethanesulfonate and a trialkylamine to produce 3-(1-silyloxyalkyl)indoles. Neutralization of the reaction mixture with pyridine followed by deprotection under basic conditions with tetrabutylammonium fluoride provides the 1:1 adduct as the free alcohol. This method prevents spontaneous conversion of the desired products to the thermodynamically favored bisindolyl(aryl)methanes, a process typically observed when indoles are reacted with aldehydes under acidic conditions.
A highly efficient route to C-3 alkyl-substituted indoles via a metal-free transfer hydrogenation
Chen, Cai,Feng, Huan-Xi,Li, Zhi-Long,Cai, Pin-Wen,Liu, Yan-Kai,Shan, Lian-Hai,Zhou, Xian-Li
supporting information, p. 3774 - 3776 (2014/07/07)
A highly efficient route to C-3 alkyl-substituted indoles via completely metal-free catalytic transfer hydrogenation of 3-indolemethanols was developed. This process proceeds via vinylogous iminium intermediates formed in situ in the presence of Br?nsted
Di- and triheteroarylalkanes via self-condensation and intramolecular Friedel-Crafts type reaction of heteroaryl alcohols
Dhiman, Seema,Ramasastry
supporting information, p. 8030 - 8035 (2013/12/04)
An efficient synthetic approach to diheteroarylmethanes and 1,3-diheteroarylpropenes has been developed via Yb(iii)-catalyzed sequential self-condensation of 2-furfuryl (or 2-thienyl or 3-indolyl) alcohols followed by intramolecular Friedel-Crafts type re
Rearrangement of Arylhydrazones of α,β-Unsaturated Carbonyl Compounds in Polyphosphoric Acid. 6
Fusco, Raffaello,Sannicolo, Franco
, p. 4374 - 4378 (2007/10/02)
The reactions of a series of N-methyl-N-arylhydrazones of α,β-unsaturated carbonyl compounds 1 with hot polyphosphoric acid are described.Three main courses were observed, depending on the structure of the carbonyl portion of the substrate.Unsaturated α-oxo ester hydrazones (1a-c) rearranged to give substituted 3--2-oxo-3-butenoic acid esters (2a-c); the reaction mechanism strictly resembles the initial steps of the Fischer indole synthesis.Unsaturated aldehyde hydrazones alternatively gave either the di-3-indolylmethane derivatives (3a,b) or the amino nitriles (4a-c).The first process develops through intermediates structurally similar to 2; the latter was demonstrated to be exclusively intramolecular.
