Catalytic Enantioselective Arylation of <i>N</i>-Tosylarylimines with Arylboronic Acids Using <i>C</i><sub>2</sub>-Symmetric Cationic <i>N</i>-Heterocyclic Carbene Pd<sup>2+</sup> Diaquo Complexes
作者:Guang-Ning Ma、Tao Zhang、Min Shi
DOI:10.1021/ol802861s
日期:2009.2.19
The asymmetric arylation of N-tosylimines with arylboronic acids was realized by using chiral cationic C-2-symmetric N-heterocyclic carbene (NHC) Pd2+ diaquo complex 5b as the catalyst in combination with 1.0 equiv of K3PO4 center dot 3H(2)O in THF at 4 degrees C in the presence of powdered 4 angstrom MS to afford the corresponding adducts in excellent yields (up to 99%) and good to high enantioselectivities (up to 94% ee).