Selective production of imines and benzimidazoles by cooperative bismuth(III)/transition metal ion catalysis

Kocsis, Marianna and Szabados, Márton and Ötvös, Sándor Balázs and Samu, Gergely Ferenc and Fogarassy, Zsolt and Pécz, Béla and Kukovecz, Ákos and Kónya, Zoltán and Sipos, Pál Miklós and Pálinkó, István and Varga, Gábor (2022) Selective production of imines and benzimidazoles by cooperative bismuth(III)/transition metal ion catalysis. JOURNAL OF CATALYSIS, 414. pp. 163-178. ISSN 0021-9517

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Abstract

Cooperative Bi(III)/Co(II) and Bi(III)/Mn(II) heterogeneous catalysts have been developed enabling efficient oxidative annulations for preparing both cross-coupled imines and benzimidazoles under ambient conditions in an atom-economic and time-efficient manner, involving ambient air as oxidant and without the need of any other additives. This is the first synergistic Lewis acid/transition metal catalyzed annulation which is potentiated by the interfaces between the building blocks of the catalysts. To achieve our goals, a useful fabrication process has been developed to heterogenize the transition metal ions via strong interactions on well-known Sillèn-type bismuth subcarbonate (bismutite). Their reusability, activity and selectivity as well as water-tolerance have made them potential competitors to effective heterogeneous/homogeneous catalysts reported previously.

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