Catalytic enantioselective Henry reaction of α-keto esters, 2-acylpyridines and 2-acylpyridine <i>N</i>-oxides
作者:Feilong He、Guanghui Chen、Junxia Yang、Guojuan Liang、Ping Deng、Yan Xiong、Hui Zhou
DOI:10.1039/c8ra00552d
日期:——
catalytic asymmetric Henry reaction of α-keto esters, 2-acylpyridines and 2-acylpyridine N-oxides. The corresponding β-nitro-α-hydroxy esters were obtained in good to excellent yields (up to 99%) with a high enantiomeric excess (ee) (up to 94%) with a catalyst loading of 1–2 mol%. The desired products of 2-acylpyridines and 2-acylpyridine N-oxides, which were simple methyl ketones, were obtained in medium
已经开发了一种预先制备的 Ni-PyBisulidine 配合物,用于 α-酮酯、2-酰基吡啶和 2-酰基吡啶 N-氧化物的催化不对称亨利反应。相应的 β-硝基-α-羟基酯在催化剂负载量为 1-2 mol% 的情况下以良好至优异的产率(高达 99%)和高对映体过量(ee)(高达 94%)获得。2-酰基吡啶和 2-酰基吡啶N-氧化物的所需产物是简单的甲基酮,通过使用 2 mol% 以中等至优异的产率(高达 94%)获得中等至良好的 ee(高达 86%)的催化剂。