Creation of Highly Congested Quaternary Centers via Cu-catalyzed Conjugate Addition of Alkenyl Alanates to β-Substituted Cyclic Enones
作者:Daniel Müller、Alexandre Alexakis
DOI:10.1021/ol400378v
日期:2013.4.5
prepared alkenylalanates proved to be excellent nucleophiles for the creation of highly congested quaternary centers via copper-catalyzed conjugateaddition. In addition, functionalized cis-decaline systems can now be prepared in a simple two-step sequence involving Cu-catalyzed conjugateaddition with functionalized alkenylalanates.
The conjugate addition of cis- or trans-1-alkenyl-cuprolithium complexes (RCHCH)2CuLi · Xn1 to α, β-unsaturated carbonyl compounds was found to occur with high retention of double bond geometry, affording isomerically pure cis- or trans-γ, δ-ethylenic carbonyl compounds. The same 1-alkenylcuprates also react stereospecifically with alkyl halides to give isomerically pure cis- or trans-olefins.
发现在α,β-不饱和羰基化合物上可以顺式或反式-1-烯基-铜锂复合物(RCHCH)2 CuLi·X n 1的共轭加成反应,可以保持双键几何结构的高度保留,从而提供异构体纯的顺式-或反式-γ,δ-烯属羰基化合物。相同的1-烯基铜酸酯也与卤代烷立体定向反应,得到异构纯的顺式或反式烯烃。