Synthesis of novel chiral biquinolyl diphosphine ligand and its applications in palladium-catalyzed asymmetric allylic substitution reactions
作者:Rui Zhang、Bin Xie、Guo-Shu Chen、Liqin Qiu、Yi-Xin Chen
DOI:10.1016/j.tetlet.2016.01.007
日期:2016.2
reactions using optical pure BIQOL as starting material and the molecular structure of (R)-BIQAP was determined by single-crystal X-ray diffraction. The ligand was used for Pd-catalyzed asymmetric allylic substitution reactions. High enantioselectiveties were obtained in the corresponding C–C and C–N bond formation of 1,3-diphenyl-2-propenyl acetate, with dimethyl malonate (up to 94% ee) and with potassium
以光学纯BIQOL为起始原料,通过两步反应合成了一种新型手性二膦配体6,6'-双(二苯基膦基)-5,5'-联喹啉(BIQAP),并确定了(R)-BIQAP的分子结构通过单晶X射线衍射。该配体用于Pd催化的不对称烯丙基取代反应。通过与丙二酸二甲酯(高达94%ee)和邻苯二甲酰亚胺钾(高达96%ee)的1,3-二苯基-2-丙烯基乙酸酯的相应C–C和C–N键形成,获得高对映选择性。