Highly Enantioselective Epoxidation Catalyzed by Cinchona Thioureas: Synthesis of Functionalized Terminal Epoxides Bearing a Quaternary Stereogenic Center
A brilliant debut! Cinchonathioureas have been reported for the first time as catalysts in the area of asymmetric oxidations. They efficiently promote an unprecedented highlyenantioselectiveepoxidation of deactivated 1,1‐disubstituted alkenes to terminalepoxides containing a quaternarystereogeniccenter (see scheme).