Cyclobutadiene rhodium complexes as catalysts for the synthesis of amides from electron‐rich arenes, tosyl azide and COстатья
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Дата последнего поиска статьи во внешних источниках: 17 июня 2021 г.
Аннотация:Cyclobutadiene rhodium complexes [(C4R4)RhX]2 (R=Et, Ph; X = I, Cl) at 0.5 mol% loading catalyze the formation of aromatic amides from various indoles, tosyl azide, and carbon monoxide (1 atm). The reaction gives good yields of the target products (typically 60‐85%) and tolerates both donor and moderately acceptor substituents in the indoles (alkyl, OMe, Hal, COOMe, but not CN). The DFT calculations at the PBE/3ζ level revealed a new possible mechanism for the reaction of TsN3 with CO via cycloaddition and formation of RhCON3 metallacycle, which is more favorable than the commonly assumed formation of nitrene intermediate.