Density Functional Theory-Inspired Design of Ir/P,S-Catalysts for Asymmetric Hydrogenation of Olefins
作者:Jorge Faiges、Carlota Borràs、Isidro M. Pastor、Oscar Pàmies、Maria Besora、Montserrat Diéguez
DOI:10.1021/acs.organomet.1c00450
日期:2021.10.25
of alkenes with the same substitution pattern and olefin geometry as the benchmark olefin, regardless of the presence of functional groups with different coordination abilities (ee values up to 97%). Appealingly, further modifications at the thioether groups and at the biaryl phosphite moiety allowed the highly enantioselective hydrogenation of olefins with different substitution patterns (e.g., α,β-unsaturated
in Lewis base‐stabilizedsilyliums has been studied. Complete retention of configuration at silicon is observed at low temperature in silyliumionsstabilized by lone‐pair interactions. In contrast, loss of chiral memory is observed with systems involving π‐interactions. Epimerization of the silicon center was observed by simply allowing equilibration of the diastereomeric silyliums at RT or by adding
A facile and efficient protocol for the synthesis of 2′‐functionalized 1,1′‐binaphthyl‐2‐ols has been developed. The C,O‐dilithio reagent (2) generated by the reductive ring‐opening of binaphthofuran (1) with lithium was treated with the corresponding electrophiles to give 2′‐functionalized 1,1′‐binaphthyl‐2‐ols including the halides (3), amine (4), acid (5), aldehyde (6), carbonate (7) or phosphonate