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A series of fused isoxazolidines have been prepared via 1,3-dipolar cycloaddition reactions of N-protected methylenenitrones with 1,3-dimethyluracil derivatives, and their NMR spectra have been recorded in TFA-d and in CDCl3 over a wide range of temperatures. The spectra indicate the presence of two invertomers for all isoxazolidines. Barriers to nitrogen inversion in the cycloadduct 6a have been...
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