Catalytic asymmetric transfer hydrogenation (ATH) of ketones has emerged as an attractive alternative to the use of hydrogen for the preparation of optically active secondary alcohols.[1] The majority of the research carried out in this area has relied on RuII catalysts bearing optically active phosphines and amino/sulfonamides.[1] Among the most widely employed catalytic systems is that of Noyori et al., namely the RuII–TsDPEN catalyst ( ...
