Asymmetric transfer hydrogenation of ketones in aqueous solution catalyzed by rhodium(III) complexes with C2-symmetric fluorene-ligands containing chiral (1R,2R)-cyclohexane-1,2-diamine

AUTOR(ES)

Montalvo-González, Rubén, Chávez, Daniel, Aguirre, Gerardo, Parra-Hake, Miguel, Somanathan, Ratnasamy

FONTE

Journal of the Brazilian Chemical Society

DATA DE PUBLICAÇÃO

2010

RESUMO

Dois ligantes C2-simétricos bis(sulfonamide) contendo o fluoreno-quiral (1R,2R)-ciclohexano-1,2-diamina foram complexados com RhIII(Cp*) e usados como catalizador para redução aromática de cetonas. Os alcoois secundários correspondentes foram obtidos com ee 87-100% e rendimento de 85-99%, sob condições de transferência de hidrogenio assimétrica (THA), usando formato de sodio aquoso como fonte de hidretos. Usando acetofenona, obteve-se ee de 94% e rendimento de 86-97%, com uma razão substrato/catalizador de 10.000.

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