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卷 16, 期 3, 页码 648-651出版社
AMER CHEMICAL SOC
DOI: 10.1021/ol4037117
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- CSIR-NCL [MLP026026]
- CSIR-New Delhi
A highly regio- and diastereoselective TMSOTf promoted vinylogous Mannich reaction for the synthesis of chiral quaternary 3-aminooxindole butenolides from 2-silyloxy furans and chiral ketimines is described. The method is found to be very efficient and also provides a facile access to sterically challenging 3-aminooxindole butenolides bearing two quaternary centers in continuation. Further, the versatility of the method is demonstrated by the 1,4-addition of nucleophiles on the sterically congested butenolide substructure..
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