Isosterically designed chiral catalysts: Rationale, optimization and their application in enantioselective nucleophilic addition to aldehydes
作者:En Gao、Qiao Li、Lili Duan、Lin Li、Yue-Ming Li
DOI:10.1016/j.tet.2020.131648
日期:2020.11
enantioselective nucleophilic addition to aldehydes. In the presence of 10 mol% of chiral ligand 1b, enantioselective addition of diethylzinc to aldehydes provided the corresponding secondary alcohols in up to 90% isolated yield and up to 99% ee. Similarly, using 3e as chiral ligand, enantioselective arylation and alkynylation of aldehydes also proceeded readily, leading to the desired chiral alcohols in up to
基于脯氨酸的方法设计了基于脯氨酸的N,N'-二氧化物配体,并将其成功应用于醛的对映选择性亲核加成反应。在10mol%的手性配体1b的存在下,将二乙基锌对映选择性地添加到醛中,以高达90%的分离产率和高达99%的ee提供了相应的仲醇。类似地,使用3e作为手性配体,醛的对映选择性芳基化和炔基化也很容易进行,从而得到所需的手性醇,分别以99%ee和80%分离产率以及84%ee分离率高达92%。当前的工作将有助于扩大手性配体和手性催化剂设计中的结构多样性。