Tunable phosphinite, phosphite and phosphoramidite ligands for the asymmetric hydrovinylation reactions
作者:Haengsoon Park、Ramaiah Kumareswaran、T.V. RajanBabu
DOI:10.1016/j.tet.2005.03.120
日期:2005.6
successfully employed for the Ni-catalyzed asymmetric hydrovinylation reaction. Diarylphosphinites, carrying β-acylamino groups prepared from readily available carbohydrates, in conjunction with highly dissociated counteranions [(3,5-(CF3)2C6H3]4B− or SbF6−}, effect the hydrovinylation of vinylarenes under ambient pressure of ethylene with high enantioselectivity. Nitrogen substituents such as –COCF3 and COPh
仅有限数量的配体已成功用于Ni催化的不对称氢乙烯基化反应。Diarylphosphinites,携带β-酰氨从容易得到的碳水化合物制备基,结合高度离解的抗衡[(3,5-(CF 3)2 C ^ 6 ħ 3 ] 4乙-或的SbF 6 - },效果乙烯基芳烃的hydrovinylation在高对映选择性的乙烯环境压力下,氮取代基(例如–COCF 3和COPh基团)会导致初级产物(3-芳基丁烯)异构化为Z-和E-2-芳基-2-丁烯。在2 arylproionic酸的原型合成,(小号)-3-(4-溴苯基)-1-丁烯(89%ee)的已被转化成(- [R )-布洛芬通过Ni-催化的交叉偶联我- BuMgBr,然后用NaIO 4和KMnO 4氧化双键。根据联萘酚和胺部分的相对构型和性质,使用由二萘酚衍生的亚磷酰胺作为配体,降冰片烯与乙烯的不对称共聚反应可得到1:1、2:1或聚合加合物。与亚磷-镍复合物之一,抗衡栏4