α-Pyridylation of Chiral Amines via Urea Coupling, Lithiation and Rearrangement
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