Screening of a modular sugar-based phosphoroamidite ligand library in the asymmetric nickel-catalyzed trialkylaluminium addition to aldehydes
作者:Eva Raluy、Montserrat Diéguez、Oscar Pàmies
DOI:10.1016/j.tetasy.2009.06.014
日期:2009.7
A modular sugar-based phosphoroamidite ligand library for the Ni-catalyzed trialkylaluminium addition to aldehydes has been synthesized and screened. After systematic variation of the sugar backbone, the substituents at the phosphoroamidite moieties and the flexibility of the ligand backbone, the monophosphoroamidite ligand 3-amine-3-deoxy-1,2:5,6-di-O-isopropylidene-((3,3′-di-trimethylsilyl-1,1′-biphenyl-2
合成并筛选了用于镍催化的醛基三烷基铝的模块化糖基亚磷酰胺配体库。在系统改变糖主链,亚磷酰胺部分的取代基和配体主链的柔性之后,单亚磷酰胺配体3-胺-3-脱氧-1,2:5,6-二-O-异亚丙基-((3发现,(3'-二-三甲基甲硅烷基-1,1'-联苯-2,2'-二基)亚磷酸酯)-α-d-葡萄糖呋喃糖1d是最佳的。几种芳基醛的活性很高,对映选择性很好(ee高达78%)。