作者:Jonathan Clayden、Ulrich Hennecke
DOI:10.1021/ol801332n
日期:2008.8.21
2-, 3- and 4-Bromopyridine, along with other brominated electron-deficient arenes, undergo palladium-catalyzed coupling with ureas of structure RNMeCONHMe. Where R is a chiral, alpha-substituted benzyl group, treatment with LDA leads to a benzylic organolithium which undergoes rearrangement with stereospecific and regiospecific transfer of the pyridyl group, generating a quaternary stereogenic center
2-,3-和4-溴吡啶和其他溴化的电子缺陷型芳烃与结构为RNMeCONHMe的脲进行钯催化偶联。当R为手性,α-取代的苄基时,用LDA处理可导致苄基有机锂发生重排,吡啶基立体定向和区域特异性转移,从而产生具有高对映选择性的立体立体中心。在中性条件下尿素的醇解反应显示出吡啶胺。