A practical, one-pot synthesis of enantiopure unsymmetrical salen ligands is described, using a 1: 1: 1 molar ratio of a chiral diamine and two different salicylaldehydes. The new synthetic protocol can be readily performed in good yields (60-85%) on a multigram scale with good tolerance toward various functional groups.
机构:
Tokyo Inst Technol, Fac Engn, Grad Sch Sci & Engn, Dept Appl Chem,Meguro Ku, Tokyo 1528552, JapanMitsui Chem Inc, Catalyst Sci Lab, Chiba 2990265, Japan