Highly efficient asymmetric transfer hydrogenation of ketones in emulsions

Ru-TsDPEN (TsDPEN = N-(p-tolylsulfonyl)-1,2-diphenylethylenediamine) catalyzed asymmetric transfer hydrogenation of ketones in emulsions is reported for the first time. The new protocol provides markedly enhanced activity and enantioselectivities (up to 99% ee) as compared with results when performed either in an aqueous medium or in common organic solvents.