Synthesis of new planar chiral [2.2]paracyclophane Schiff base ligands and their application in the asymmetric Henry reaction
作者:Dongyue Xin、Yudao Ma、Fuyan He
DOI:10.1016/j.tetasy.2010.02.007
日期:2010.3
A series of new planar and central chiralligandsbased on [2.2]paracyclophane backbones were designed and prepared from enantiomerically pure 4-amino-13-bromo[2.2]paracyclophane and commercially available chiral amino alcohols. Their application in a copper-catalyzed asymmetric Henry reaction resulted in secondary alcohols with high yield and excellent selectivity for active aldehydes (up to 94% ee)
A series of diastereomerically pure Schiff baseligandsbased on [2.2]paracyclophane backbones were synthesized and separated. The new planarchiral [2.2]paracyclophane Schiff bases were used as ligands in Cu-catalyzed asymmetric Henry reactions with high yields and enantioselectivities.