Facile synthesis of C2-symmetric tridentate bis(thiazoline) and bis(oxazoline) ligands and their application in the enantioselective Henry reaction
作者:Shao-Feng Lu、Da-Ming Du、Shi-Wei Zhang、Jiaxi Xu
DOI:10.1016/j.tetasy.2004.09.011
日期:2004.11
A series of novel C2-symmetricbis(thiazoline) ligands with a diphenylamine backbone as a linkage between two thiazoline rings were synthesized by the use of the simple reagent phosphorus pentasulfide. Their application in the catalytic asymmetric Henry reaction of α-keto esters was investigated with comparison to the corresponding bis(oxazoline) ligands. Cu(II)–bis(oxazoline) complexes furnished moderate