New biphenol-based, fine-tunable monodentate phosphoramidite ligands for catalytic asymmetric transformations.

Hua, Zihao; Vassar, Victor C; Choi, Hojae; Ojima, Iwao · Proc Natl Acad Sci U S A · 2004

basic_science · Level V

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Abstract

Monodentate phosphoramidite ligands have been developed based on enantiopure 6,6'-dimethylbiphenols with axial chirality. These chiral ligands are easy to prepare and flexible for modifications. The fine-tuning capability of these ligands plays a significant role in achieving high enantioselectivity in the asymmetric hydroformylation of allyl cyanide and the conjugate addition of diethylzinc to cycloalkenones.

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