The treatment of α-ketoimidoyl chlorides with amine bases in the presence of a variety of dipolarophiles provides the corresponding Δ1-pyrroline derivatives in good to moderate yields; these cycloaddition reactions presumably involve acylnitrile ylides as reactive intermediates.
W. Tian and T. Livinghouse, J. Chem. Soc., Chem. Commun., 1989, 819 DOI: 10.1039/C39890000819
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