NHC-Catalyzed/Titanium(IV)–Mediated Highly Diastereo- and Enantioselective Dimerization of Enals

摘要

An NHC-catalyzed, diastereo- and enantioselective dimerization of enals has been developed. The use of Ti(Oi-Pr)4 is a key element for the reactivity and selectivity of this process. The cyclopentenes are obtained with high levels of diastereo- and enantioselectivity and their synthetic utility is demonstrated by functionalization of the product alkene.