A directing effect of neighboring aromatic groups on the regiochemistry of formation and stereochemistry of alkylation and bromination of ketone lithium enolates. Evidence for lithium-arene coordination and dramatic effect of copper(I) in controlling stereochemistry and limiting polyalkylation
Rhodium(I)-Catalyzed Enantioselective Activation of Cyclobutanols: Formation of Cyclohexane Derivatives with Quaternary Stereogenic Centers
作者:Tobias Seiser、Nicolai Cramer
DOI:10.1002/chem.200903225
日期:2010.3.15
The activation of carbon–carbon σ bonds is a complementary method to access uncommon and difficult‐to‐prepare organometallic species. Herein, we describe the activation of tert‐cyclobutanols through an enantioselective insertion of a chiral rhodium(I) complex into the CC σ bond of the cyclobutane, forming a quaternarystereogeniccenter and an alkyl‐rhodium functionality that initiates ring‐closure