Palladium-Catalyzed Synthesis of Enantiomerically Pure α-Substituted Allylboronic Esters and Their Addition to Aldehydes
作者:Enrique Fernández、Jörg Pietruszka、Wolfgang Frey
DOI:10.1021/jo1008959
日期:2010.8.20
palladium-catalyzed carbonyl allylations with SnCl2 to obtain enantiomerically pure α-substituted allylboronic esters 8 and 9. The reaction proceeds regioselectively and with high, simple diastereoselectivity to form anti-products. Their addition to aldehydes yields enantiomerically enriched homoallylic alcohols 17 and 18, respectively. Synthesis, characterization, and a mechanistic rational is presented here.
酒石酸衍生的硼酸酯2可以用SnCl 2进行钯催化的羰基烯丙基化,以获得对映体纯的α-取代的烯丙基硼酸酯8和9。该反应区域选择性地进行,并且具有高,简单的非对映选择性,从而形成反产物。将它们添加到醛中分别得到对映体富集的均烯丙基醇17和18。本文介绍了合成,表征和机械原理。