Polysubstituted N-H pyrroles with a wide variety of substituents were prepared from vinyl azides and 1,3-dicarbonyl compounds by using Mn(III) complexes as catalysts.
An efficient and regioselective synthesis of highlysubstituted 2-trifluoromethyl pyrrolederivatives via silver-catalyzed cyclization of vinyl azides with ethyl 4,4,4-trifluoro-3-oxobutanoate is reported. Various α-(heteo)aryl, alkyl, β-aryl, as well as α,β-disubstituted vinyl azides, participate in this transformation. The reaction mechanism likely involves the addition of in situ generated 2H-azirine