Chiral oxazolines ligands are a class of nitrogen ligands have been successfully used in the asymmetric catalysis of a variety of reactions for the past decade. These ligands are readily achieved from amino alcohols. However, these catalysts require high catalyst-to-substrate ratio to achieve high enantioselectivity. Therefore, there is a great deal of interest to immobilize these catalysts on mesoporous silicas such as SBA-15. The inherent advantage of heterogeneous catalysts over homogeneous ones is their ease of separation and handling. Indeed, even though homogeneous catalysts provide more diverse potential applications, heterogeneous catalysts are more used in terms of production. Herein, chiral oxazoline ligands were synthesized from 4-amino benzoic acid in four steps, and then immobilized on SBA-15 mesoporous silicas . the resulting new heterogeneous catalysts were utilized in asymmetric allylic oxidation of cyclohexene also with good yield and moderate enantioselectivity.
