Chiral <i>N</i>-Heterocyclic Carbene Ligand Enabled Nickel(0)-Catalyzed Enantioselective Three-Component Couplings as Direct Access to Silylated Indanols
作者:Joachim S. E. Ahlin、Nicolai Cramer
DOI:10.1021/acs.orglett.6b01492
日期:2016.7.1
An enantioselective nickel(0)-catalyzed reductive three-component coupling between aromatic aldehydes, norbornenes, and silanes affords directly silyl-protected indanol derivatives. A new bulky chiral C2-symmetric NHC (NHC = N-heterocyclic carbene) ligand basing on the 1,2-di(napthalen-1-yl)ethylene diamine backbone allows accessing the annulated products as single diastereoisomers in high enantioselectivity
Nickel-Catalyzed Three-Component Coupling between Aryl Aldehydes, Norbornenes, and Silanes Leading to Indanols through Aromatic CH Bond Activation of Aryl Aldehydes
The first example of the title reaction involving the combination of an aryl aldehyde, norbornene, and silane has been developed (see scheme). The reaction involves aromatic CH bondactivation of an aryl aldehyde at the ortho position, it proceeded with good diastereoselectively, and is applicable for various aryl aldehydes and norbornenes or norbornadienes. cod=cycloocta‐l,5‐diene, THF=tetrahydrofuran