Synthesis of Novel 1,4-Bissulfonamide Ligands for Enantioselective Addition of Diethylzinc to Aldehydes
作者:Minghua Yang、Jiangtao Sun、Chengjian Zhu
DOI:10.1002/cjoc.201180303
日期:2011.8
Several novel chiral sulfonamide ligands based on (1R,2S,4R,5S)‐1,4‐diamino‐2,5‐dimethylcyclohexane skeleton have been synthesized and their application in the enantioselective addition of diethylzinc to aldehydes was investigated in the presence of Ti(OiPr)4. The effect of ligands, temperature and the loading amount of ligands was studied. Under optimized conditions, enantioselective addition of diethylzinc
合成了几种基于(1 R,2 S,4 R,5 S)-1,4-二氨基-2,5-二甲基环己烷骨架的新型手性磺酰胺配体,并研究了它们在二乙基锌对醛的对映选择性加成中的应用。 Ti(O i Pr)4的存在。研究了配体的影响,温度和配体的负载量。在最佳条件下,二乙基锌与各种芳基醛和脂族醛的对映选择性加成反应顺利进行,并提供了高达88%ee的手性仲醇。