Versatile Direct Synthesis of Oligosubstituted Pyrroles by Cycloaddition of α‐Metalated Isocyanides to Acetylenes

Acceptor-substituted pyrroles can be prepared from acetylenes and isocyanides in an efficient and direct manner by a formal cycloaddition under basic conditions or, even simpler, in the presence of catalytic amounts of nanosize copper powder or copper(I) benzenethiolate.