羰基合成与选择氧化国家重点实验室（OSSO）知识库

A new series of monodentate phosphites based on the rigid, axially chiral monoesterified H₈-BINOL, which are easy to prepare from the readily accessible phosphorylating reagents (S_a)- or (R_a)-1,1′-binaphthyl-2,2′-diylchlorophosphite and (S_a)- or (R_a)-1,1′-H₈-binaphthyl-2,2′-diylchlorophosphite, have been synthesized. All ligands were purified on a silica gel column under a nitrogen atmosphere with moderate yields, and were white solids and air-stable at room temperature. These ligands afforded good to excellent enantioselectivities in the Cu-catalyzed 1,4-conjugate addition of 2-cyclohexenone with nucleophiles Et₂Zn (96% ee) and with Ph₂Zn (65% ee), 2-cyclopentenone with Et₂Zn (95% ee), 2-cycloheptenone with Et₂Zn (76% ee), and 5,6-dihydro-2H-pyran-2-one with Et₂Zn (90% ee). In the Rh-catalyzed asymmetric hydroformylation of styrene, these ligands showed a chemoselectivity of >99% in aldehydes, and a satisfactory branched over linear ratio (96/4). Moreover, the sense of the enantiodiscrimination of the products was mainly determined by the configuration of the BINOL-based or H₈-BINOL-based phosphocycle.