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The asymmetric conjugate reduction of 3-aryl-4-phosphonobutenoates has been demonstrated which provides an enantioselective synthesis of optically active 3-aryl-4-phosphonobutyric acid esters. A wide range of 3-aryl-4-phosphonobutenoate derivates are reduced with high enantioselectivities (up to 94% ee) using an (S)-Segphos/Cu(OAc) 2 ·H 2 O catalyst system (1 or 5mol%) in the presence...
Unsymmetrical hybrid chiral ferrocenyl phosphine-phosphoramidite ligands have been applied for the first time in the Cu-catalyzed asymmetric 1,4-reduction of β-aryl substituted α,β-unsaturated esters. The results show that the ligand bearing (S c )-central, (R p )-planar, and (R a )-axial chiralities gave the best performance. The present catalytic system proved to be highly...
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