New Concepts for Organocatalysis
33
Scheme 28. Asymmetric counteranion-directed catalysis: transfer hydrogenation of different enones with catalyst 35
Independently, MacMillan et al. developed an efficient catalyst system that is based on a chiral secondary amine (Tuttle et al. 2006).
6
Conclusions
Selected recent developments in the area of asymmetric organocatalysis in our laboratory have been briefly summarized. Enamine catalysis,
Brønsted acid catalysis, and iminium catalysis turn out to be powerful
new strategies for organic synthesis. Using Hantzsch ester as the hydride source, highly enantioselective transfer hydrogenantion reactions
have been developed. We have also developed an additional new con-
33
Scheme 28. Asymmetric counteranion-directed catalysis: transfer hydrogenation of different enones with catalyst 35
Independently, MacMillan et al. developed an efficient catalyst system that is based on a chiral secondary amine (Tuttle et al. 2006).
6
Conclusions
Selected recent developments in the area of asymmetric organocatalysis in our laboratory have been briefly summarized. Enamine catalysis,
Brønsted acid catalysis, and iminium catalysis turn out to be powerful
new strategies for organic synthesis. Using Hantzsch ester as the hydride source, highly enantioselective transfer hydrogenantion reactions
have been developed. We have also developed an additional new con-