A silver triflate-catalyzed cascade of in situ-oxidation and allylation of arylbenzylamines
摘要:
A silver-triflate catalyzed cascade of in situ-oxidation and allylation of arylbenzylamines is reported. The 2,2,6,6-tetramethylpiperidine-1-oxoammonium tetrafluoroborate is employed as a mild oxidant which is compatible with both catalyst and ligand. Racemic BINAP is also utilized to assist with the catalyst in regulating the yields of products. Various homoallylic amines are obtained in 39-99% yields. (C) 2016 Elsevier Ltd. All rights reserved.
Allylation of Aldehydes and Imines: Promoted by Reuseable Polymer-Supported Sulfonamide of <i>N</i>-Glycine
作者:Gui-long Li、Gang Zhao
DOI:10.1021/ol0528235
日期:2006.2.1
[reaction: see text] A allylation of aldehydes and imines (generated in situ from aldehydes and amines) with allyltributyltin promoted by recoverable and reusable the polymer-supportedsulfonamide of N-glycine has been developed. Good to high yields were obtained in various cases. Most of the SnBu(3) residue can be recovered as Bu(3)SnCl. Highly stereoselective synthesis of N-Boc-(2S,3S)-3-hydroxy-2-phenylpiperidine
Synthetic and Mechanistic Studies of Indium-Mediated Allylation of Imines in Ionic Liquids
作者:Man Chun Law、Tin Wai Cheung、Kwok-Yin Wong、Tak Hang Chan
DOI:10.1021/jo062198x
日期:2007.2.1
Aldimines derivedfrom aryl and non-enolizable aliphatic aldehydes were allylated with allyl bromide mediated by indium powder in [bpy][BF4] (bpy = N-butylpyridine) to give good yields of the corresponding homoallylic amines. Selective formation of monoallylated amines can be achieved by varying the amount of bromide ion additive in the form of [bpy][Br]. The transient organoindium intermediates, allylindium(I)
Synthesis of polystyrene-bound perfluoroalkyl sulfonic acids and the application of their ytterbium salts in multicomponent reactions (MCRs)
作者:Yueyan Yin、Gang Zhao、Gui-Long Li
DOI:10.1016/j.tet.2005.08.118
日期:2005.12
New polystyrene-bound perfluoroalkyl sulfonicacids and their ytterbium salts have been prepared. Multicomponent reactions (MCRs) for the efficient synthesis of homoallylic amines or amides catalyzed by the polystyrene-bound perfluoroalkyl sulfonic ytterbium salts are reported.
Homoallylic amines are synthesized by the three-component coupling reaction of aldehydes, amines and allyltributylstannane using a heterogeneous solid acid catalyst, montmorillonite KSF, under mild reaction conditions to afford the corresponding homoallylic amines in excellent yields.
Aldehydes vs Aldimines. Unprecedented Aldimine-Selective Nucleophilic Additions in the Coexistence of Aldehydes Using a Lanthanide Salt as a Lewis Acid Catalyst
作者:Shū Kobayashi、Satoshi Nagayama
DOI:10.1021/ja971153y
日期:1997.10.1
It is well-recognized that aldimines are less reactive than aldehydes toward nucleophilic additions. In this paper, an unprecedented change in the reactivity is described: preferential reactions of aldimines over aldehydes in nucleophilic additions using a lanthanide salt as a Lewis acidcatalyst. In the presence of a catalytic amount of ytterbium triflate (Yb(OTf)3), only aldimines reacted with silyl