A new class of bis-oxazoline ligands for the Cu-catalysed asymmetric cyclopropanation of olefins
                                
                                    
                                        作者:Ashutosh V. Bedekar、Pher G. Andersson                                    
                                    
                                        DOI:10.1016/0040-4039(96)00736-8
                                    
                                    
                                        日期:1996.6
                                    
                                    A set of new chiral bis-oxazolines, 5a-b and 6a-c, has been syntheised from D and L-diethyl 2,3-O-isopropylidene tartrates and chiral amino alcohols. These ligands were found to be efficient in the Cu(I)-catalysed asymmetric cyclopropanation of olefins. Bis-oxazolines of this type based on readily available valine were found comparable with previous ligands based on the more expensive tert-leucine
                                    由D和L-
二乙基2,3- O-异亚丙基
酒石酸酯和手性
氨基醇合成了一组新的手性双-
恶唑啉5a-b和6a-c。发现这些
配体在Cu(I)催化的烯烃的不对称
环丙烷化中是有效的。发现基于易得的缬
氨酸的这种类型的双
恶唑啉与先前的基于较昂贵的叔亮
氨酸的
配体相当。