First Examples of Improved Catalytic Asymmetric C−C Bond Formation Using the Monodentate Ligand Combination Approach
作者:Ate Duursma、Rob Hoen、Julia Schuppan、Ron Hulst、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1021/ol035106o
日期:2003.8.1
combination of chiral monodentate phosphoramidite ligands in the rhodium-catalyzed conjugate addition of boronic acids to three different substrates, we have shown for the first time that the ligand combination approach is applicable for C-C bond formation. Chiral catalysts based on hetero-combinations of ligands are found to be more effective than the homo-combinations. (31)P NMR experiments show that the