Stereoselective synthesis of syn β-hydroxy cycloalkane carboxylates: transfer hydrogenation of cyclic β-keto esters via dynamic kinetic resolution
作者:Abel Ros、Antonio Magriz、Hansjörg Dietrich、José M. Lassaletta、Rosario Fernández
DOI:10.1016/j.tet.2007.05.058
日期:2007.8
The transfer hydrogenation of bicyclic and monocyclic β-keto esters using HCO2H/Et3N as the hydrogen source and TsDPEN-based Ru(II) catalysts proceeds with dynamic kinetic resolution to afford the corresponding cyclic β-hydroxy esters with moderate to excellent levels of diastereo- and enantioselectivities. The mild reaction conditions used make possible to preserve in most cases the syn relative configuration
使用HCO 2 H / Et 3 N作为氢源和基于TsDPEN的Ru(II)催化剂进行的双环和单环β-酮酯的转移加氢反应具有动态动力学分辨率,可得到相应的环状β-羟基酯,具有中等至优异的非对映和对映选择性的水平。所使用的温和的反应条件使得有可能在大多数情况下以保持顺式产物的相对构型,已知的方法来合成,提供互补的工具反异构体。
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