Monodentate phosphoramidites; versatile ligands in catalytic asymmetric intramolecular Heck reactions
作者:Rosalinde Imbos、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1039/b300565h
日期:——
The Pd-catalysed intramolecular asymmetricHeckreaction (AHR) of cyclohexadienone monoacetals in the presence of chiral phosphoramidite ligands is described. High enantioselectivities (up to 96% ee) are reached with monodentate ligands. The highest selectivity is observed with Taddol-based phosphoramidites containing a small amine substituent. A study of the effect of the leaving group at the aryl