Planar-Chiral Thioureas as Hydrogen-Bond Catalysts
作者:Jakob F. Schneider、Florian C. Falk、Roland Fröhlich、Jan Paradies
DOI:10.1002/ejoc.200901353
日期:2010.4
The synthesis of the first enantiopure planar-chiralthioureacatalysts is herewith described. New catalysts 1-3 were applied in asymmetric transformations, such as the Friedel-Crafts alkylation of indole, as well as in the transfer hydrogenation of nitroolefins. Bifunctional catalysts 2 and 3 exhibit enhanced activity in the investigated reactions, demonstrating their potential for organic synthesis