 a zinc  prophenol - catalyzed 
 direct asymmetric aldol reaction 
 between glycine schiff bases and aldehydes is reported . 
 the design 
 and synthesis of new prophenol ligands bearing 2,5-trans - disubstituted pyrrolidines was essential for the success of this 
 process . 
 the transformation operates at room temperature and affords syn -hydroxy--amino esters in high yields 
 with good to excellent levels of diastereo- and enantioselectivity . 
Supplementary Material