Highly Efficient Synthesis of Isoquinolines via Nickel-Catalyzed Annulation of 2-Iodobenzaldimines with Alkynes: Evidence for Dual Pathways of Alkyne Insertion
作者:Rajendra Prasad Korivi、Chien-Hong Cheng
DOI:10.1021/ol0519994
日期:2005.11.1
[reaction: see text] A wide range of substituted isoquinolines were synthesized via a highly efficient nickel-catalyzed annulation of the tert-butyl imines of 2-iodobenzaldehydes and various alkynes; examination of the regiochemistry of isoquinolines synthesized indicates that there are two different alkyne insertion pathways for the catalytic reactions.
Assembly of Isoquinolines via CuI-Catalyzed Coupling of β-Keto Esters and 2-Halobenzylamines
作者:Bao Wang、Biao Lu、Yongwen Jiang、Yihua Zhang、Dawei Ma
DOI:10.1021/ol800900a
日期:2008.7.3
CuI-catalyzed coupling of 2-halobenzylamines with beta-ketoesters or 1,3-diketones in i-PrOH under the action of K(2)CO(3) produced 1,2-dihydroisoquinolines as the coupling/condensative cyclization products, which underwent smooth dehydrogenation under air atmosphere to afford substituted isoquinolines.
Synthesis of Isoquinolines and Pyridines via Palladium-Catalyzed Iminoannulation of Internal Acetylenes
作者:Kevin R. Roesch、Richard C. Larock
DOI:10.1021/jo980871f
日期:1998.8.1
Synthesis of Isoquinolines and Pyridines by the Palladium-Catalyzed Iminoannulation of Internal Alkynes
作者:Kevin R. Roesch、Haiming Zhang、Richard C. Larock
DOI:10.1021/jo0105540
日期:2001.11.1
A wide variety of substituted isoquinoline, tetrahydroisoquinoline, 5,6-dihydrobenz[f]isoquinoline, pyrindine, and pyridine heterocycles have been prepared in good to excellent yields via annulation of internal acetylenes with the tert-butylimines of o-iodobenzaldehydes and 3-halo-2-alkenals in the presence of a palladium catalyst. The best results are obtained by employing 5 mol % of Pd(OAc)(2), an excess of the alkyne, 1 equiv of Na2CO3 as a base, and 10 mol % of PPh3 in DMF as the solvent. This annulation methodology is particularly effective for aryl- or alkenyl-substituted alkynes. When electron-rich imines are employed, this chemistry can be extended to alkyl-substituted alkynes. Trimethylsilyl-substituted alkynes also undergo this annulation process to afford monosubstituted heterocyclic products absent the silyl group.
Maassarani, Fida; Pfeffer, Michel; Le Borgne, Guy, Organometallics, 1987, vol. 6, # 10, p. 2029 - 2043
作者:Maassarani, Fida、Pfeffer, Michel、Le Borgne, Guy