Journal
ORGANIC LETTERS
Volume 7, Issue 17, Pages 3773-3776Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol051433f
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Buta-2,3-dienoate reacts with vinyl ketenimine to give the corresponding substituted aniline through a Diels-Alder cycloaddition. Besides the expected Diels-Alder adduct 3a, the aniline 3b was also obtained in a ratio of 91:9. The observed C-13 exchange is explained on the basis of a reversible [2 + 2] cycloaddition competing with the [4 + 2] process. This is supported by B3LYP DFT computations, as a stepwise pathway lies very close in energy to the [4 + 2] concerted one.
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