allo-Threonine-derived oxazaborolidinone (10 mol %) catalyzes the Friedel−Craftsalkylation of furans and indoles with simple acyclic α,β-unsaturated ketones to give products with high yield and high enantioselectivity. The use of N,N-dimethylaniline (2.5−10 mol %) as an additive is essential for enantioselectivity.