期刊
JOURNAL OF ORGANIC CHEMISTRY
卷 75, 期 19, 页码 6424-6435出版社
AMER CHEMICAL SOC
DOI: 10.1021/jo1009867
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资金
- University of Florida
Base-functionalized aza-bis(oxazoline) ligands were prepared to explore the concept of dual activation through the Lewis acid and a tethered tertiary amine base, The catalytic activity of the Cu complex was evaluated for the asymmetric Henry reaction. Compared with a corresponding unfunctionalized copper complex with external 1-benzyl-4-ethylpiperazine base, the ethylpiperazine-functionalized aza-bis(oxazoline) copper catalyst resulted in rate acceleration (2.5 times) as well as improved enantioselectivity (72% ee vs 92% ee).
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