Abstract
The reactions of conjugated aroylazoalkenes with β-diketones and β-ketoesters in the presence and in the absence of copper(II) chloride as catalyst have been studied. In the first case, 1-aminopyrrole derivatives have been obtained, while in the second case the formation of 2-hydroxy-4-pyrrolines as stable intermediates has been frequently detected. The observations on the conditions of the formation of either or both products, as well as the proof of the easy conversion of 2-hydroxy-4-pyrrolines into pyrrole derivatives elucidate the much debated behaviour of these reactions.
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