oa South African Journal of Chemistry - Application of ()-pentacycloundecane bis(4-phenyloxazoline) as a novel chiral ligand for catalysis of the asymmetric Diels-Alder reaction of cyclopentadiene with 3-acryloyl-2-oxazolidinone : research article



The synthesis of the novel C symmetric ()-pentacycloundecane bis(4-phenyloxazoline) ligand and its evaluation as a chiral Lewis acid catalyst in the benchmark asymmetric Diels-Alder reaction between 3-acryloyloxazolidin-2-one () and cyclopentadiene () is reported. From the various metal salts screened the anhydrous magnesium perchlorate complex emerged as the best catalyst. The endo-cycloadduct product was afforded in 81% enantiomeric excess with an endo:exo ratio of 98:2. An extensive screening of various metal ions as complexing agents was performed and is also reported.


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