Chiral Amino Alcohol Derived Bis-phosphoramidite Pincer Palladium Complexes and Their Applications in Asymmetric Allylation of Aldimines
作者:Jie Li、Martin Lutz、Anthony L. Spek、Gerard P. M. van Klink、Gerard van Koten、Robertus J. M. Klein Gebbink
DOI:10.1021/om100021p
日期:2010.3.22
arene ligands and their corresponding metal complexes. The molecularstructure of the new indolinemethanol-derived phosphoramidite pincer metal complex screens quadrants I and III, which is in contrast to the previously reported l-proline-derived P-chiral ligands that screen quadrants II and IV. The bis-phosphoramidite pincer palladium complexes 1 and 2 are active catalysts for asymmetric homoallylation
The unprecedented development of asymmetric Rh-catalyzed 1,2-allylation of N-Ts- and N-Ns-aldimines is achieved. This protocol utilizes potassium allyltrifluoroborates and various aldimines to generate enantioenriched homoallylic amines in the presence of 3.0 mol % of Rh(I)/L1b catalyst with up to 90% yield, 98% ee (R = H), and 10:1 diastereoselectivity (R = Me or Ph), yielding the same major diastereomer