A nickel-catalyzed asymmetric Suzuki–Miyaura cross-coupling of racemic 3-bromo-phthalides and arylboronic acids was realized for the synthesis of diverse chiral 3-aryl-phthalides in moderate to excellent reaction yields. The reaction proceeded in a stereoconvergent manner and high enantioselectivities were observed for most examined examples. A number of functional groups like aldehyde, ester and bromide
Rhodium(III)-Catalyzed Asymmetric Addition of Inert Arene C–H Bond to Aldehydes To Afford Enantioenriched Phthalides
作者:Wenkun Chen、Jie Li、Hui Xie、Jun Wang
DOI:10.1021/acs.orglett.0c01052
日期:2020.5.1
An asymmetric rhodium(III)-catalyzed Grignard-type addition of inert arene C-H bond to aldehydes is reported. It provides a new strategy for the synthesis of chiral 3-substituted phthalides in good yields (up to 87%) with high enantiomeric purity (up to 99% ee). Interestingly, a chiral-matching effect between substrate and catalyst was observed, which is crucial to accomplish satisfied reaction outcomes
Transition metal-catalyzed addition reactions of arylboronic acids with alkyl 2-formylbenzoates: efficient access to chiral 3-substituted phthalides
作者:Chun-Hui Xing、Yuan-Xi Liao、Ping He、Qiao-Sheng Hu
DOI:10.1039/c001104e
日期:——
Transition metal-catalyzed addition of arylboronicacids to 2-formylbenzoates afforded 3-substituted phthalides. By using SPINOL-based phosphites as ligands, a Rh(I)-catalyzed asymmetric version of such an addition reaction was achieved.
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