primary amine catalyzed efficient and practical protocol for the large-scale synthesis of Wieland–Miescher and Hajos–Parrishketones as well as their analogues. This article describes a simple chiral primary amine catalyzed efficient and practical protocol for the large-scale synthesis of Wieland–Miescher and Hajos–Parrishketones as well as their analogues.
A series of Wieland-Miescher ketone analogues bearing highly functionalized substituents are efficiently constructed in high enantioselectivities and good yields using catalytic amounts of prolinamide and PPTS. We have successfully utilized this reaction as a key step to synthesize the tricyclic core of cylindricine type alkaloids.