期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 133, 期 15, 页码 5695-5697出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja200283n
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An asymmetric I,4-addition reaction of 5H-oxazol-4-ones with alkynyl carbonyl compounds was developed, and, for the first time, high enantiomeric and geometric control was achieved to afford the thermodynamically unstable Z-isomer predominantly using chiral guanidine catalysts bearing a hydroxy group at the appropriate position. The method provides synthetically useful gamma-butenolide ester bearing a chiral quaternary stereogenic center.
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