Kinetic Resolution of Tertiary Propargylic Alcohols by Enantioselective Cu−H-Catalyzed Si−O Coupling
作者:Jan Seliger、Xichang Dong、Martin Oestreich
DOI:10.1002/anie.201813229
日期:2019.2.11
A broad range of tertiary propargylic alcohols were kinetically resolved by catalyst‐controlled enantioselective silylation. This non‐enzymatic kineticresolution is catalyzed by a Cu−H species and makes use of the commercially available precatalyst MesCu/(R,R)‐Ph‐BPE and a simple hydrosilane as the resolving reagent. Both alkyl,aryl‐ as well as dialkyl‐substituted propargylic alcohols participate
Refinement of the Catalyst Backbone of Chiral Intramolecular Silicon-Sulfur Lewis Pairs: Improved Enantioselectivity in the Diels-Alder Reaction of Cyclohexa-1,3-diene and Chalcone Derivatives
Step by step. A new, structurally modified silicon cation intramolecularly stabilized by a sulfur donor catalyzes challenging Diels–Alder reactions of cyclohexa‐1,3‐diene and chalcone derivatives with improved enantiomeric excesses. The endo selectivity typically observed is inverted to exo with cyclopentadiene, and no enantioinduction is obtained.