Asymmetric Direct Michael Reactions of Cyclohexanone with Aromatic Nitroolefins in Water Catalyzed by Novel Axially Unfixed Biaryl-Based Bifunctional Organocatalysts
new family of axiallyunfixedbiaryl-basedwater-compatible bifuctional organocatalysts were designed and synthesized for the asymmetric direct Michael reaction of cyclohexanone with various nitroolefins in water. One of the organocatalysts incorporates pyrrolidine and arylsulfonamide motifs as active organocatalytic sites, and axiallyunfixed biaryl as a skeleton; with this organocatalyst, the direct
设计并合成了一类新的轴向未固定联芳基水相容双功能有机催化剂,用于环己酮与水中各种硝基烯烃的不对称直接迈克尔反应。其中一种有机催化剂包含吡咯烷和芳基磺酰胺基序作为活性有机催化位点,以及轴向未固定的联芳基作为骨架;使用这种有机催化剂,直接迈克尔反应很容易进行,以高产率(高达 99% 的产率)提供所需的迈克尔加合物,并具有高水平的立体控制(高达 >99:1 dr 和 94% ee)。
A Highly Enantioselective Catalytic Domino Aza-Michael/Aldol Reaction: One-Pot Organocatalytic Asymmetric Synthesis of 1,2-Dihydroquinolidines
The highly enantioselective organocatalyticdomino aza-Michael/aldol reaction is presented. The unprecedented, chiral amine-catalyzed asymmetricdominoreactions between 2-aminobenzaldehydes and α,β-unsaturated aldehydes proceed with excellent chemo- and enantioselectivity to give the corresponding pharmaceutically valuable 1,2-dihydroquinolines derivatives in high yields with 90 to >99 % ee.