Chemoenzymatic synthesis of chiral 2,2′-bipyridine ligands and their N-oxide derivatives: applications in the asymmetric aminolysis of epoxides and asymmetric allylation of aldehydes
作者:D. R. Boyd、N. D. Sharma、L. Sbircea、D. Murphy、J. F. Malone、S. L. James、C. C. R. Allen、J. T. G. Hamilton
DOI:10.1039/b919894f
日期:——
A series of enantiopure 2,2′-bipyridines have been synthesised from the corresponding cis-dihydrodiol metabolites of 2-chloroquinolines. Several of the resulting hydroxylated 2,2′-bipyridines were found to be useful chiral ligands for the asymmetric aminolysis of meso-epoxides leading to the formation of enantioenriched amino alcohols (→84% ee). N-oxide and N,N′-dioxide derivatives of these 2,2′-bipyridines
从相应的化合物中合成了一系列对映体纯的2,2'-联吡啶 顺式-二氢二醇2-氯喹啉的代谢产物。发现一些所得的羟基化的2,2'-联吡啶是有用的手性配体,用于内消旋环氧化合物的不对称氨解,导致形成对映体富集的氨基醇(→84%ee)。氮氧化物和N,N'-二氧化物已经合成了这些2,2'-联吡啶的衍生物,包括可分离的阻转异构体,并在醛的不对称烯丙基化中用作对映选择性有机催化剂,得到烯丙基醇(→86%ee)。