Enantioselective Copper-Catalyzed Conjugate Addition of Trimethylaluminium to β,γ-Unsaturated α-Ketoesters
作者:Ludovic Gremaud、Alexandre Alexakis
DOI:10.1002/anie.201107324
日期:2012.1.16
Not a cop out: The copper‐catalyzed asymmetric conjugateaddition of organometallic reagents to Michael acceptors is an important methodology for forming a CC bond in an enantioselective manner. Such an addition of Me3Al to β,γ‐unsaturatedα‐ketoesters is described to proceed in high yield and selectivity. CuTC=copper(I) thiophene‐2‐carboxylate.
We report herein the enantioselectiveCu-catalyzed conjugate addition of organometallic reagents to sensitive Michael acceptors and their application to the synthesis of relevant target molecules. This is one of the most important methodologies to form a C-C bond in an enantioselective manner. A wide range of alpha,beta-unsaturated aldehydes and beta,gamma-unsaturated-alpha-ketoesters has been successfully
Sc(OTf)<sub>3</sub>-Catalyzed Three-Component Cyclization of Arylamines, β,γ-Unsaturated α-Ketoesters, and 1,3-Dicarbonyl Compounds for the Synthesis of Highly Substituted 1,4-Dihydropyridines and Tetrahydropyridines
作者:Lu Liu、Ryan Sarkisian、Yongming Deng、Hong Wang
DOI:10.1021/jo400578m
日期:2013.6.7
A Sc(OTf)3-catalyzed three-component cyclization reaction of arylamines, β,γ-unsaturated α-ketoesters and 1,3-dicarbonyl compounds was developed to synthesize highly substituted 1,4-dihydropyridines and fused bicyclic tetrahydropyridines carrying a quaternary all-carbon center.
A change in tune: A novel [4+1] annulation between atropisomeric sulfur ylides 1 and unsaturated imines 2 was developed. The method allows the synthesis of enantioenriched pyrroline products 3 in high yield and with excellent stereocontrol. The origin of stereoinduction was primarily rationalized by a conformational analysis of the ylides.
Cy‐SaBOX/Copper(II)‐Catalyzed Highly Diastereo‐ and Enantioselective Synthesis of Bicyclic N,O Acetals
作者:Qiong‐Jie Liu、Lijia Wang、Qi‐Kai Kang、X. Peter Zhang、Yong Tang
DOI:10.1002/anie.201603911
日期:2016.8
for the asymmetric construction of the useful and important skeleton of the bicyclic N,O‐acetals is described. CuII/SaBOX could catalyze the reaction of β,γ‐unsaturatedα‐ketoesters with cyclic enamines efficiently, thus affording the desired products in excellent yields with excellent stereoselectivities (21 examples; up to 99 % yields; up to >95:5 d.r.; and 95–99 % ee). This reaction can be well performed
描述了不对称构造双环N,O-乙缩醛的有用和重要骨架的便捷有效途径。Cu II / SaBOX可以有效催化β,γ-不饱和α-酮酸酯与环状烯胺的反应,从而以优异的收率和优异的立体选择性提供所需的产物(21个实例;最高99%的产率;最高> 95:5 dr ;和95–99%ee)。即使仅负载1mol%的催化剂,该反应也可以以克为单位很好地进行。铜配合物的单晶结构使人们对侧臂的立体协同效应有了很好的了解。