Danishefsky's diene and aldimine underwent aza Diels-Alder reaction under the influence of chiral phosphoric acid derived from (R)-BINOL as a chiral Brønsted acid to afford piperidinone derivatives in good to high enantioselectivity. Addition of CH3CO2H improved both reactivity and enantioselectivity.
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Akiyama et al. (2005) studied this question.