chiral boron compounds. This protocol is well suitable for activated alkenes such as vinylarenes and alkenes bearing directing groups. However, the catalytic enantioselective hydroboration of O-substituted alkenes has remained unprecedented. Here we report a Rh-catalyzed enantioselective hydroboration of silyl enol ethers (SEEs) that utilizes two new chiral phosphine ligands we developed. This approach
烯烃的不对称
硼氢化反应已被证明是合成手性
硼化合物最有效的方法之一。该协议非常适用于活化的烯烃,如
乙烯基芳烃和带有导向基团的烯烃。然而,O-取代烯烃的催化对映选择性
硼氢化反应仍然是前所未有的。在这里,我们报告了利用我们开发的两种新手性
膦配体的 Rh 催化对映选择性
硼氢化硅烯醇醚 (
SEE)。该方法具有反应条件温和、底物范围广、官能团耐受性好等特点,可以高效制备具有合成价值的手性
硼烷醚。