期刊
AUSTRALIAN JOURNAL OF CHEMISTRY
卷 68, 期 3, 页码 401-403出版社
CSIRO PUBLISHING
DOI: 10.1071/CH14556
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资金
- EPSRC [EP/H003711/1]
- Engineering and Physical Sciences Research Council [EP/H003711/1] Funding Source: researchfish
We describe catalytic asymmetric C-C formation using terminal alkyl-metal nucleophiles generated from internal olefins through a chain-walking' isomerization mechanism. Hydrometallation of internal olefins with the Schwartz reagent gives the least hindered alkyl-zirconocene after thermal (60 degrees C in THF) isomerization. After switching the solvent from THF to dichloromethane, the alkyl-zirconocenes can be used in copper-catalyzed asymmetric conjugate additions. Addition to a variety of cyclic ,-unsaturated species were achieved in modest (22-50%) yield with high (84-92% ee) enantioselectivity. This work demonstrates that remote C-H functionalization coupled with asymmetric C-C bond formation is possible, but the present procedures are limited in terms of yield and olefin scope.
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