A New Asymmetric Synthesis of (R)- and (S)-3-Arylphthalides: Extremely High Diastereoselective Reaction of Arylcarbaldehydes with Chiral [2-(1,3-Oxazolidin-2-yl)phenyl]titanium Ate Complexes
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)。
Catalytic asymmetric synthesis of 3-aryl phthalides enabled by arylation–lactonization of 2-formylbenzoates
作者:Andressa M. M. Carlos、Rafael Stieler、Diogo S. Lüdtke
DOI:10.1039/c8ob02872a
日期:——
The catalytic asymmetric synthesis of 3-aryl phthalides is reported through a sequential asymmetric arylation–lactonization reaction. The reaction is enabled by a boron–zinc exchange to generate reactive arylating agents, which react with 2-formylbenzoates in the presence of a chiral amino naphthol ligand. The enantiodetermining step is the arylation of the aldehyde, which then undergoes a lactonization
Catalytic asymmetric 1,2-Addition/Lactonization tandem reactions for the syntheses of chiral 3-Substituted phthalides using organozinc reagents
作者:Huayin Huang、Yabai Wang、Hua Zong、Ling Song
DOI:10.1002/aoc.4643
日期:2019.1
Using chiral phosphoramide ligand 2d‐Zn (II) complex derived from (1R,2R)‐1,2‐diphenylethylenediamine as the catalyst, we have developed efficient catalytic asymmetric 1,2‐addition/lactonization tandem reactions of diverse organozinc reagents with varied methyl 2‐formylbenzoates for the construction of optically enriched 3‐aryl or alkyl substituted phthalides, which are significant building blocks