Synthesis of axially chiral C10-BridgePHOS oxides and their use as organocatalysts in enantioselective allylations of aldehydes
作者:Jianzhong Chen、Delong Liu、Dongyang Fan、Yangang Liu、Wanbin Zhang
DOI:10.1016/j.tet.2013.07.030
日期:2013.9
of C10-BridgePHOS oxides possessing different substituted groups on the diphenyl phosphine system were synthesized and tested as organocatalysts in the allylation of aldehydes with allyltrichlorosilane, providing chiral homoallylic alcohols. These types of organocatalysts showed high catalytic activity and only 2 mol% catalyst loading was required to induce short reaction times. Under optimal reaction
合成了一系列在二苯膦系统上具有不同取代基的C 10 -BridgePHOS氧化物,并作为醛与烯丙基三氯硅烷的烯丙基化反应的有机催化剂进行了测试,提供了手性均烯丙基醇。这些类型的有机催化剂显示出高催化活性,并且仅需要2 mol%的催化剂负载量即可缩短反应时间。在最佳反应条件下,对于多种底物,均获得了优异的产品收率和高达92%的ee。