作者:Neil J. Fitzmaurice、W.Roy Jackson、Patrick Perlmutter
DOI:10.1016/0022-328x(85)87381-2
日期:1985.4
The regioselectivity of hydrocyanation of silylalkynes can be controlled by varying the size of the groups attached to silicon leading, for example, to efficient preparations of E-3-trialkylsilyl-2-alkyl-2-alkenenitriles. High yields of the silylalkene nitriles can be obtained by using either acetone cyanohydrin or hydrogen cyanide as reagents.
Silicon electronic effect in the Pauson–Khand reaction of alkynylsilanes with allenes
作者:Frédéric Antras、Mohammed Ahmar、Bernard Cazes
DOI:10.1016/s0040-4039(01)01750-6
日期:2001.11
The β-effect of silicon was shown to be a determining factor for the regioselectivity of the Pauson–Khand reaction of alkynylsilanes with allenes. This electroniceffect accounts for the formation of 3-trimethylsilyl-4-alkylidenecyclopentenones observed from monosubstituted allenes.
Tuning of Regioselectivity in the Coupling Reaction Involving Allenic/Propargylic Palladium Species
作者:Shengming Ma、Aibin Zhang
DOI:10.1021/jo0111098
日期:2002.4.1
Two different types of coupling patterns for the Pd(0)-catalyzed coupling reaction of allenic/propargylic zinc reagents with organic halides or propargylic carbonates (acetate) with the corresponding organometallicreagents were observed. After studying the controlling factors on the regioselectivity of this reaction, we demonstrated that the steric hindrance of both reactants and the types of organic
Regio- and stereo-chemical control in the nickel-catalysed addition of HCN to alkynes. A simple synthesis of (E)-2-alkyl-3-trialkylsilylalk-2-enenitriles
作者:Gary D. Fallon、Neil J. Fitzmaurice、W. Roy Jackson、Patrick Perlmutter
DOI:10.1039/c39850000004
日期:——
it is p ossible to control, to a high degree, the regiochemical outcome of nickel(0)-catalysed hydrocyanations of alk-1-ynes: the crystal structure of one adduct is included which establishes that the stereochemical outcome of the reaction is a result of addition of HCN to the alkyne to give an (E)-product; overall, these results constitute a simple method for the preparation of (E)-2-alkyl-3-trialk
Direct Alkenylation and Alkylation of Pyridone Derivatives by Ni/AlMe<sub>3</sub> Catalysis
作者:Yoshiaki Nakao、Hiroaki Idei、Kyalo Stephen Kanyiva、Tamejiro Hiyama
DOI:10.1021/ja907214t
日期:2009.11.11
derivatives are achieved through inter- and intramolecular insertion of alkynes, 1,3-dienes, and alkenes into the C(6)-H bond by nickel/AlMe(3) catalysis. Coordination of the heterocycles to the Lewis acid cocatalyst through their basic carbonyl oxygen is considered to be responsible for the regioselective activation of the C-H bonds, probably through oxidativeaddition to nickel(0).