Application of Bidentate Oxazoline–Carbene Ligands with Planar and Central Chirality in Asymmetric β-Boration of α,β-Unsaturated Esters
作者:Zonghong Niu、Jianqiang Chen、Zhen Chen、Manyuan Ma、Chun Song、Yudao Ma
DOI:10.1021/jo5021135
日期:2015.1.2
oxazoline-substituted imidazolium salts based on [2.2]paracyclophane were synthesized and characterized. The new bidentate oxazoline–carbene precursor with planar and central chirality had significant advantage than the bicyclic 1,2,4-triazolium salt derived from [2.2]paracyclophane as a monodentate carbene ligand in Cu(I)-catalyzed asymmetric β-boration of α,β-unsaturated esters, giving the desired products
合成并表征了一系列基于[2.2]对环环烷的新的恶唑啉取代的咪唑鎓盐。新型的具有平面和中心手性的二齿恶唑啉-卡宾前体比由[2.2]对环环烷作为单齿卡宾配体的双环1,2,4-三唑鎓盐在Cu(I)催化的α的不对称β-硼酸酯上具有明显的优势。 ,β-不饱和酯,以高对映选择性和产率得到所需产物。