a primary amine group and two amide units have been developed and evaluated in the direct asymmetric intermolecular aldol reaction of 4-nitrobenzaldehyde and cyclohexanone. When 2,4-dinitrophenol (DNP) was used as an acidic additive, the catalyzed reactions of various aldehydes and ketones gave the corresponding aldol products with moderate to high enantioselectivities (up to 95%) and diastereoselectivities
一系列含有
伯胺基团和两个酰胺单元的缬
氨酸二肽有机催化剂已被开发并在 4-硝基
苯甲醛和
环己酮的直接不对称分子间醛醇反应中进行评估。当使用 2,4-
二硝基苯酚 (DNP) 作为酸性添加剂时,各种醛和酮的催化反应得到相应的醛醇产物,具有中到高的对映选择性(高达 95%)和非对映选择性(高达 >99/1, anti/syn) 在 3c 存在于盐
水中。图形摘要。