Synthesis of β- and γ-Carbolines by the Palladium/Copper-Catalyzed Coupling and Cyclization of Terminal Acetylenes
作者:Haiming Zhang、Richard C. Larock
DOI:10.1021/jo0258857
日期:2002.10.1
A variety of 3-substituted beta- and gamma-carbolines have been synthesized from N-substituted 3-iodoindole-2-carboxaldehydes and 2-bromoindole-3-carboxaldehydes, respectively. The coupling of these aldehydes with various terminal acetylenes with PdCl2(PPh3)(2)/CuI as the catalyst readily affords the corresponding alkynylindole carboxaldehydes, which have subsequently been converted to the corresponding tert-butylimines and cyclized to beta- and gamma-carbolines by either copper-catalyzed or thermal processes.
Catalytic Enolate Arylation with 3-Bromoindoles Allows the Formation of β-Carbolines
作者:C. Henrique Alves Esteves、Peter D. Smith、Timothy J. Donohoe
DOI:10.1021/acs.joc.7b00299
日期:2017.4.21
Synthesis of substituted β-carbolines was accomplished by utilizing the catalytic enolate arylation reaction of ketones in conjunction with several 3-bromoindole derivatives. Quenching of the arylation reaction in situ with an electrophile allowed ready incorporation of functionality at the carboline C-4 position in an efficient one-pot protocol.
Silver/Rhodium Relay Catalysis Enables C−H Functionalization of
<i>In Situ</i>
Generated Isoquinolines with Sulfoxonium Ylides: Construction of Hexahydrodibenzo[
<i>a</i>
,
<i>g</i>
]quinolizine Scaffolds
作者:Quanzhe Li、Ruixing Liu、Yin Wei、Min Shi
DOI:10.1002/adsc.202100141
日期:2021.5.18
developed. The acylmethylated isoquinoline derivatives could be afforded with broad substrate scope in 23–88% yields, which could be further transformed to the core skeleton of hexahydrodibenzo[a,g]quinolizine as drug-candidates. Moreover, this reaction was achieved in a gram-scale. A reasonable reaction mechanism has been proposed based on a series of control and KIE experiments.