期刊
ORGANIC LETTERS
卷 11, 期 23, 页码 5366-5369出版社
AMER CHEMICAL SOC
DOI: 10.1021/ol9018584
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-
资金
- National Science Foundation [NSF-CHE-0709061]
Lewis acid complexation is generally required for chiral-auxiliary-controlled stereoselectivity, and chiral Lewis acid catalysis is frequently optimal for introducing asymmetry. In this work, we show that nitrile ylide cycloadditions to electron-poor acceptors attached to chiral auxiliaries proceed in high yield and stereoselectivity In the absence of Lewis acids. In contrast, chiral Lewis acids are inferior in these cycloadditions.
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