Binaphthyl–prolinol chiral ligands: design and their application in enantioselective arylation of aromatic aldehydes
作者:Chao Yao、Yaoqi Chen、Ruize Sun、Chao Wang、Yue Huang、Lin Li、Yue-Ming Li
DOI:10.1039/d1ob00289a
日期:——
Binaphthyl–prolinol ligands were designed and applied in enantioselective arylation of aromatic aldehydes and sequential arylation–lactonization of methyl 2-formylbenzoate. Under optimized conditions, the reactions provided the desired diarylmethanols and 3-aryl phthalides in up to 96% yields with up to 99% ee and up to 89% yields with up to 99% ee, respectively. In particular, essentially optically
联萘-脯氨醇配体被设计并应用于芳香醛的对映选择性芳基化和2-甲酰基苯甲酸甲酯的顺序芳基化-内酯化。在优化的条件下,反应分别以高达 96% 的产率和高达 99% 的 ee 和高达 89% 的产率和高达 99% 的 ee 提供了所需的二芳基甲醇和 3-芳基苯酞。特别是,通过重结晶大量获得了基本上光学纯的 3-芳基苯酞(超过 99% ee)。
Diastereomeric Aziridine Carbinol Catalyzed Enantioselective Arylation Reaction: Toward the Asymmetric Synthesis of Both Enantiomers of Chiral 3-Aryl Phthalide
The diastereomeric aziridine carbinols are applied, respectively, as efficient chiral ligand in the catalysis of asymmetric arylation and sequential arylation-lactonization cascade. The two diastereomers, which are facilely synthesized from the same chiral source, function as pseudo enantiomers in arylation of aromatic aldehydes providing the different enantiomers of the diarylmethanols with almost the same excellent enantioselectivities. The arylation method is also carried out in tandem with lactonization process to afford a concise synthetic approach to both enantiomers of optically active 3-aryl phthalide.