Designing chiral amido-oxazolines as new chelating ligands devoted to direct Cu-catalyzed oxidation of allylic C H bonds in cyclic olefins
作者:Saadi Samadi、Khosrow Jadidi、Mojgan Samadi、Akram Ashouri、Behrouz Notash
DOI:10.1016/j.tet.2018.12.062
日期:2019.2
characterization of the complex confirmed the involvement of both dentate parts of the ligands, the oxygen and nitrogen atoms, in complexation with copper. The utilization of this amido-oxazoline ligands in the copper-catalyzed enantioselective esterification of allylic CH bonds of cyclic olefins with tert-butyl-4-nitrobenzoperoxoate resulted in the highest activities, yields (up to 95%) and enantioselectivities
从廉价和可商购的材料中方便地合成了新型的酰胺基-恶唑啉配体,其产率高且对映体过量。与此类配体的相应的手性铜络合物[C 2对称的小号,小号双(酰氨基-恶唑啉铜(II)复合物]进行了相应的合成。配体的ORTEP图6A和复杂6A进行了比较和表征-铜该配合物证实了配体的两个齿状部分(氧和氮原子)均与铜络合,该酰胺基-恶唑啉配体在铜催化的环烯烃的烯丙基C H键的对映选择性酯化中的利用在HZSM-5沸石的存在下,4-硝基苯并过氧叔丁基叔丁基酯具有最高的活性,最高收率(高达95%)和对映选择性(最高96%)。与文献中报道的其他方法相比,这些新发现突显了该协议是氧化环烯烃不对称烯丙基CH键的最有吸引力和最有用的方法之一。