Abstract
Penta-substituted pyrrole derivatives, including a three-membered ring (5-azaspiro[2.4]heptan), were readily prepared in moderate to excellent yields by the Pd-catalyzed intramolecular cyclization reaction of alkynyl carboxamide compounds. When an excess amount of ZnCl2 acted as a Lewis acid and a source of halide, the one-pot bi-metallic system could afford more valuable penta-substituted chloroethyl pyrrole products under similar conditions. This indicates that the present method is a powerful tool for the preparation of a wide range of functionalized and polysubstituted pyrroles.
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