Angew. Chem. Int. Edit. 2020
The concept of extended MCRs with indolealdehydes.
Rodolfo Lavilla Research Group
Significance
The participation of reactants undergoing a polarity inversion along a multicomponent reaction, allows the continuation of the transformation with productive domino processes. Thus, indole aldehydes in Groebke-Blackburn-Bienaymé reactions lead to an initial adduct which spontaneously triggers a series of events leading to the discovery of novel reaction pathways together with a direct access to a variety of linked, fused and bridged polyheterocyclic scaffolds. Indole 3- and 4-carbaldehydes with suitable isocyanides and aminoazines afford fused adducts through oxidative Pictet-Spengler processes, whereas indole 2-carbaldehyde yields linked indolocarbazoles under mild conditions, and a bridged macrocycle at high temperature. These novel structures are potent activators of the human aryl hydrocarbon receptor signaling pathway.
Ghashghaei, O.; Pedrola, M.; Seghetti, F.; Martin, V. V.; Zavarce, R.; Babiak, M.; Novacek, J.; Hartung, F.; Rolfes, K. M.; Haarmann-Stemmann, T. & Lavilla, R.: Extended Multicomponent Reactions with Indole Aldehydes: Access to Unprecedented Polyheterocyclic Scaffolds, Ligands of the Aryl Hydrocarbon Receptor. Angew. Chem. Int. Ed. online https://doi.org/10.1002/anie.202011253