摘要:
An efficient method for the construction of chiral gamma-trifluoromethylated alpha,beta-unsaturated delta-lactone, a widely existing pharmacophore, has been developed and successfully applied for synthesis of gamma-trifluoromethylated goniothalamins. The key steps included Evans-Aldol reaction of chiral titanium enolate of alpha-CF3 imide, Wittig olefination and lactonization. The transformation of gamma-trifluoromethylated alpha,beta-unsaturated delta-lactone to a series of trifluoromethylated styryllactones was also investigated. (C) 2013 Elsevier B.V. All rights reserved.