Transannular [4 + 2] Cycloaddition Reactions of Cobalt-Complexed Macrocyclic Dienynes
作者:Sedef Karabiyikoglu、Craig A. Merlic
DOI:10.1021/acs.orglett.5b01984
日期:2015.8.21
The first transannular [4 + 2] cycloaddition reactions of macrocyclic dicobalt hexacarbonyl–dienyne complexes were demonstrated. Complexes were conveniently prepared through palladium(II)-catalyzed intramolecular oxidative cyclization of bis(vinylboronate esters) followed by complexation with dicobalt octacarbonyl. Transannular [4 + 2] cycloaddition reactions of the complexes occurred at lower temperatures
α-Allenic ethers 2 are prepared by the reaction of 1,4-dialkoxy-2-butynes 1 with lithium aluminium hydride and magnesium bromide. Tertiary α-allenic amines 4 are obtained by treating 4-dialkylamine-1-methoxy-2-butynes 3 with lithium aluminium hydride and aluminium chloride.
Birkofer,L. et al., Chemische Berichte, 1963, vol. 96, p. 3280 - 3288
作者:Birkofer,L. et al.
DOI:——
日期:——
Gauthier,D., Annales de Chimie (Cachan, France), 1909, vol. <8> 16, p. 332
作者:Gauthier,D.
DOI:——
日期:——
Chain-Growth Cycloaddition Polymerization via a Catalytic Alkyne [2 + 2 + 2] Cyclotrimerization Reaction and Its Application to One-Shot Spontaneous Block Copolymerization
A cobalt-catalyzed alkyne [2 + 2 + 2] cycloaddition reaction has been applied to polymerizations yielding linear polymers via selective cross-cyclotrimerization of yne-diyne monomers, which occurs in a chain-growth manner. Additionally, through control of the alkyne reactivity of the two monomers, this method was efficiently applied to the spontaneous block copolymerization of their mixture. Here we present the proposed mechanism of the catalyst transfer process of this cycloaddition polymerization.