Nickel-Catalyzed Intermolecular Coupling of 1,3-Dienes and Aldehydes via Transmetalation of Nickelacycles with Diisobutylaluminum Acetylacetonate
摘要:
Intermolecular coupling reactions of 1,3-dienes and aldehydes via transmetalation of nickelacycle intermediate with (BU2Al)-B-i-acac were investigated. In the reactions, a linear adduct or a branched adduct was produced, depending upon the nature of 1,3-dienes and aldehydes, via two nickelacycles that were relatively stable among the four possible nickelacycles because of the equilibrium with pi-allynickel forms.
Nickel-Catalyzed Enantio- and Diastereoselective Three-Component Coupling of 1,3-Dienes, Aldehydes, and Silanes Using Chiral N-Heterocyclic Carbenes as Ligands
Nickel(0)-catalyzed asymmetric three-componentcoupling of 1,3-dienes, aldehydes, and silanes has been realized utilizing a chiral N-heterocyclic carbene as a ligand. On the basis of the screening of various NHC precursors, an imidazolium salt having 1-(2,4,6-trimethylphenyl)propyl groups on the nitrogen was designed and synthesized. In this reaction, various coupling products were produced in good
Nickel-Catalyzed Enantio- and Diastereoselective Three-Component Coupling of 1,3-Dienes, Aldehydes, and a Silylborane Leading to α-Chiral Allylsilanes
作者:Nozomi Saito、Ayami Kobayashi、Yoshihiro Sato
DOI:10.1002/anie.201107360
日期:2012.1.27
Three‐in‐one: The nickel‐catalyzed asymmetric three‐component coupling of 1,3‐dienes, aldehydes, and a silylborane in the presence of a chiral phosphoroamidite ligand has been realized. The reaction proceeds by σ‐bond metathesis of an oxanickelacycle intermediate with the silylborane to afford the corresponding α‐chiral allylsilane derivative in a highly diastereo‐ and enantioselective manner.
Nickel(0)-catalyzed diastereoselective three-component coupling of 1,3-dienes, aldehydes, and organometallic reagents: influence of organometallic reagents on diastereoselectivity
作者:Nozomi Saito、Tetsuro Yamazaki、Yoshihiro Sato
DOI:10.1016/j.tetlet.2008.06.033
日期:2008.8
A nickel-catalyzed diastereoselective alkylative three-component coupling of 1,3-diene and aldehyde with organoboron or organosilicon reagents has been realized. The diastereoselectivity was dramatically changed depending on the class of organometallic reagents. The reaction using ArB(OH)2 in the presence of PPh3 afforded 1,3-syn-substituted 4-penten-1-ol derivative as a single diastereomer. On the
Diastereoselective Coupling of 1,3-Diene, Ketone, and Organometallic Reagents by Nickel Catalyst: Stereoselective Construction of Tetrasubstituted Carbon Centers
作者:Nozomi Saito、Tetsuro Yamazaki、Yoshihiro Sato
DOI:10.1246/cl.2009.594
日期:2009.6.5
A nickel-catalyzed three-component coupling of 1,3-diene, ketone, and organoboron or organosilicon reagents was investigated. While the coupling reaction using PhB(OH)2 afforded a 1,3-syn-substituted 4-penten-1-ol derivative as a single diastereomer, the reaction in the presence of tetraorganosilicon reagent under similar conditions exclusively produced the corresponding 1,3-anti isomer. In both reactions, a tetrasubstituted carbon center was constructed in a highly diastereoselective manner.
Nickel-catalyzed regio- and stereoselective synthesis of homoallylic alcohol derivatives from dienes and aldehydes
作者:Masanori Takimoto、Yoshiko Hiraga、Yoshihiro Sato、Miwako Mori
DOI:10.1016/s0040-4039(98)00827-2
日期:1998.6
The reaction of 1,3-Dienes and aldehydes in the presence of Et3SiH using a catalytic amount of Ni(cod)2 and PPh3 gave homoallylic alcohol derivatives in a regio- and stereoselective manner.