The formation of pyrrolinones and 2-dialkylaminofurans from γ-oxoamides

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Abstract
γ-Oxobutyramides were cyclised in the presence of acetic anhydride–perchloric acid into a variety of cyclic immonium salts, some of which were converted into pyrrolinones or 2-dialkylaminofurans; the chemistry of a typical 2-dialkylaminofuran is reported.