The enantioselective benzoin condensation promoted by chiral triazolium precatalysts: stereochemical control via hydrogen bonding
作者:Sarah E. O'Toole、Stephen J. Connon
DOI:10.1039/b908517c
日期:——
The design of a newclass of triazolium ion precatalysts incorporating protic substituents is described. These materials promote the enantioselective benzoincondensation of a range of aromatic aldehydes (1–62% ee). Catalyst evaluation studies strongly support the involvement of hydrogen bond donation by the catalyst in the stereocentre-forming step of the catalytic cycle.