Palladium-pincer-complex-catalyzed transformations involving organometallic species

被引:121
作者
Szabó, KJ [1 ]
机构
[1] Univ Stockholm, Arrhenius Lab, Dept Organ Chem, S-10691 Stockholm, Sweden
关键词
allylations; boron; catalysis; palladium; tin;
D O I
10.1055/s-2006-933137
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
Highly selective palladium-catalyzed transformations involving organoboranes, silanes, stannanes and selenides were developed by employment of pincer-complex catalysts. A novel catalytic transformation was designed for allylation of aldehyde and imine electrophiles using allylstannanes and allylboranes. These reactions proceed under mild and neutral conditions to afford homoallyl alcohols and amines with a high level of functional group tolerance. The regio- and stereoselectivity of the transformations is very high, and promising levels of enantioselectivity could be obtained by application of chiral pincer complexes. The rest of the presented reactions involve synthesis of allylstannanes, allylboranes, allenyl stannanes/silanes and organoselenides using various dimetallic reagents. Most of the presented pincer-complex-catalyzed reactions are not amenable with traditional palladium(0) catalysis. The employed mild and neutral reaction conditions allow the isolation of stereo- and regiodefined organometallic species, which are useful building blocks in advanced organic synthesis and in natural product synthesis. The mechanistic studies have revealed some important differences between the mechanism of pincer-complex-catalyzed and palladium(0)-catalyzed processes.
引用
收藏
页码:811 / 824
页数:14
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