The first azomethine ylide devoid of a stabilizing group, generated by treating trimethylamine N-oxide with lithium di-isopropylamide, undergoes a ready [3 + 2] cycloaddition with various simple alkenes to give high yields of the corresponding pyrrolidines.
R. Beugelmans, G. Negron and G. Roussi, J. Chem. Soc., Chem. Commun., 1983, 31 DOI: 10.1039/C39830000031
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