Facile one-pot synthesis of cinchona alkaloid-based P,N ligands and their application to Pd-catalyzed asymmetric allylic alkylation
作者:Qiao-Feng Wang、Wei He、Xue-Ying Liu、Hui Chen、Xiang-Yang Qin、Sheng-Yong Zhang
DOI:10.1016/j.tetasy.2008.10.030
日期:2008.11
ligands based on cinchona alkaloids is described. These ligands are easily synthesized in one-pot from commercially available enantiopure 1,2-diphenyl-1,2-ethanediol and cinchona alkaloids in two steps. Their application to the palladium(II)-catalyzed asymmetric allylic alkylation of 1,3-diphenyl-2-propenyl acetate gave the corresponding products in excellent yields and up to 94% ee. The effect of ligands
描述了基于金鸡纳生物碱的一类新型的双齿手性P,N供体配体。这些配体易于分两步从市售对映纯1,2-二苯基-1,2-乙二醇和金鸡纳生物碱中一锅合成。它们在钯(II)催化的1,3-二苯基-2-丙烯基乙酸酯的不对称烯丙基烷基化反应中的应用以优异的收率和高达94%ee给出了相应的产物。还研究了配体,底物,亲核试剂和温度对反应的影响。