Total Synthesis of Dictyodendrins by the Gold-Catalyzed Cascade Cyclization of Conjugated Diynes with Pyrroles

Total synthesis of dictyodendrins A–E was achieved on the basis of a novel gold-catalyzed cascade reaction for the construction of pyrrolo[2,3-c]carbazole scaffold. The synthetic strategy features functionalization of pyrrole pyrrolo[2,3-c]carbazole scaffold at the C1 (arylation), C2 (acylation), N3 (alkylation), and C5 (oxidation) positions. This synthetic method could be used for the diversity-oriented synthesis of dictyodendrin derivatives for medicinal applications.