Enantioselective α-Hydroxylation of β-Keto Esters Catalyzed by Cinchona Alkaloid Derivatives
作者:Qingwei Meng、Yakun Wang、Zhi Li、Ting Xiong、Jingnan Zhao
DOI:10.1055/s-0034-1378548
日期:——
A highly efficient α-hydroxylation of β-keto esters catalyzed by cupreidine in the presence of cumyl hydroperoxide (CHP) was achieved. The reaction was applied to a wide variety of β-keto esters to give products in high yields (up to 95%) with excellent enantioselectivities (up to 97% ee). The reaction had been successfully scaled up to a gram quantity and (S)-5-chloro-2-hydroxy-1-oxo-2,3-dihydro-
在枯基氢过氧化物(CHP)存在下,实现了由铜吡啶催化的β-酮酯的高效α-羟基化。该反应适用于多种 β-酮酯,以高产率(高达 95%)得到具有优异对映选择性(高达 97% ee)的产物。该反应已成功放大到克级,并且 (S)-5-chloro-2-hydroxy-1-oxo-2,3-dihydro-1H-indene-2-carboxylate – 茚虫威的重要中间体在96% 收率和 86% ee。通过结晶可将对映体过量提高到99%,该方法具有对映选择性高、催化剂易于制备和催化剂回收等优点,具有工业应用前景。