TOTAL SYNTHESIS OF PRODIGIOSIN

Article abstract of DOI:10.1016/S0040-4039(00)95451-0

The total synthesis of prodigiosin (1), possessing the characteristic pyrrolylpyrromethene skeleton of a class of naturally-occuring polypyrroles, is detailed.The approach is based on the application of an inverse electron demand Diels-Alder reaction of dimethyl 1,2,4,5-tetrazine-3,6-dicarboxylate in a 1,2,4,5-tetrazine -> 1,2-diazine -> pyrrole strategy for preparation of prodigiosin pyrrole ring B and the subsequent implementation of an intramolecular palladium(II)-promoted 2,2'-diaryl (2,2'-bipyrrole) coupling for construction of the prodigiosin 2,2'-bipyrrole AB ring system.