arylnitrones and diazo compounds by C–H activation/[4 + 1] annulation with a C(N2)–C(acyl) bond cleavage is reported, and 2,3-disubstituted NH indoles are directly synthesized in up to a 94% yield. A variety of functional groups are applicable to this reaction to give the corresponding products with high selectivity. Compared to other previously reported Rh(III)-catalyzed synthesis of homologous series, this method
Palladium-Catalyzed Intramolecular Trapping of the Blaise Reaction Intermediate for Tandem One-Pot Synthesis of Indole Derivatives
作者:Ju Hyun Kim、Sang-gi Lee
DOI:10.1021/ol200045q
日期:2011.3.18
Palladium-catalyzed intramolecular N-arylative and N-alkylative/N-arylative trappings of the Blaise reaction intermediates could be a new route to construct the indole moiety in a tandem one-pot manner from nitriles.
Copper-Catalyzed Synthesis of 2,3-Disubstituted Indoles
作者:Shinji Tanimori、Haruna Ura、Mitsunori Kirihata
DOI:10.1002/ejoc.200700428
日期:2007.8
one-step synthesis of 2,3-disubstitutedindoles from readily available starting materials, 2-iodoaniline and various β-keto esters was described. The advantage of this method is the use of cheap catalysts and simple experimental procedures undermild reaction conditions. As the substituted indole derivatives are important starting materials for the synthesis of biologically active indole alkaloids
Tandem Transformations of Nitriles into N-Heterocyclic Compounds by Electrophilic Trapping of Blaise Reaction Intermediates
作者:Hyunik Shin、Sang-gi Lee、Ju Kim、Yu Chun
DOI:10.1055/s-0031-1290814
日期:2012.6
Tandem transformations of nitriles into various N-heterocycles have been accomplished through the reaction of electrophiles with Blaise reaction intermediates formed in situ. The reaction of the Blaise reaction intermediates with propiolates gives 2-pyridones through consecutive C- and N-nucleophilic reactions. The tandem reactions of the Blaise reaction intermediate with 1,3-enynes proceed through C-nucleophilic addition followed by an electrocyclization-aromatization cascade to give pyridines. Exocyclic enamino esters can be prepared by transformations of omega-chloroalkyl nitriles through chemoselective intramolecular alkylation of the Blaise reaction intermediate. Palladium-catalyzed intramolecular arylations or copper-catalyzed intermolecular cross-coupling reactions of the Blaise reaction intermediate give a range of indole derivatives. Combinations of tandem alkylations and palladium-catalyzed couplings of the Blaise reaction intermediates of omega-chloroalkyl nitriles give N-fused indoles.