Add time:09/06/2019 Source:sciencedirect.com
The effectiveness of Sc(OTf)3 as a Lewis acid catalyst for the 1,4-addition reaction of carbamates to appropriate 2-acetyl-2-pentenoic esters is herein reported. In particular, N-benzyl-(tert-butyldimethylsilyloxy)carbamate added efficiently to the title substrates to afford a new class of polyfunctionalized isoxazolidines and isoxazolines.
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