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Abstract
Novel ferrocene modified P, N-ligands ( R, R, Sp)- 8 and ( S, S, Sp)- 9 were synthesized conveniently from enantiopure cyclohexanediamine and ( Sp)-2-phosphinoferrocenyl carboxylic acid. They were used as chiral ligands for palladium-catalyzed allylic substitutions of rac-1, 3-diphenylprop-2-enyl acetate with dimethylmalonate and benzylamine. ( R, R, Sp)- 8 was found to be a better ligand containing matched chiralities (central chirality and planar chirality) and showed a higher enantioselectivity.
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