The asymmetric challenge! New camphor‐based prolinamides were designed, synthesized, and proven to be a highly efficient organocatalysts for asymmetricMichael reactions. Treatment of unmodified aldehydes with nitroalkenes in the presence of 5–10 mol % organocatalysts provided the desired Michael products in high chemical yields (up to 94 %) and high to excellent levels of diastereo‐ and enantioselectivities
Asymmetric Michael reaction of aldehydes with β-nitroalkenes catalyzed by pyrrolidine-camphor derived organocatalysts bearing hydrogen-bond donors
作者:Jiang Weng、Hui-Bing Ai、Ren-Shi Luo、Gui Lu
DOI:10.1002/chir.21991
日期:2012.4
derived organocatalysts were designed and synthesized. These organocatalysts were used for direct Michaelreaction of aldehydes with nitroalkenes to give the desired γ‐nitrocarbonyl compounds in high yields (up to 99%), high diastereoselectivities (syn:anti up to 92:8), and good to excellent enantioselectivities (up to 94% ee). Possible transition‐state model was also proposed for this asymmetric transformation