Catalytic Asymmetric Electrochemical α‐Arylation of Cyclic β‐Ketocarbonyls with Anodic Benzyne Intermediates
作者:Longji Li、Yao Li、Niankai Fu、Long Zhang、Sanzhong Luo
DOI:10.1002/anie.202006016
日期:2020.8.17
herein is an electrochemical approach for the oxidative generation of benzynes (cyclohexyne) and its successful merging with chiral primary aminocatalysis, formulating the first catalytic asymmetric enamine–benzyne (cyclohexyne) coupling reaction. Cobalt acetate was identified to stabilize the in situ generated arynes and facilitate its coupling with an enamine. This catalytic enamine‐benzyne protocol
A series of highly strained bicyclo[3.n.1]alkenones have been successfully constructed in good-to-excellent enantioselectivities and moderate-to-good yields via copper-catalyzed formal [3+3] cycloaddition. The versatile chiral cycloadducts could be selectively converted into various valuable bridge systems, which hold considerable potential for the construction of natural and bioactive compounds containing
Chiral Amino Diol Derivatives as New Modular Organocatalysts for the Enantioselective α-Chlorination of Cyclic β-Keto Esters
作者:Pablo Etayo、Ramón Badorrey、María D. Díaz-de-Villegas、José A. Gálvez
DOI:10.1002/adsc.201000594
日期:2010.12.17
Highly modularchiralaminodiolderivatives have been used as organocatalysts in the enantioselectiveα-chlorination of cyclicβ-ketoesters. Optimization of the catalyst structure and the reaction conditions has allowed the synthesis of optically active α-chlorinated products with high enantioselectivities (up to 96% ee) using inexpensive commercially available N-chlorosuccinimide (NCS) as the chlorine
Efficient and Stereoselective Synthesis of Bicyclo[3.2.1]octan-8-ones: Synthesis and Palladium-Catalyzed Isomerization of Functionalized 2-Vinyl-2,3,3a,4,5,6-hexahydro-2,3-benzofurans
diastereoselective formation of 2-vinyl-2,3,3a,4,5,6-hexahydro-2,3-benzofurans. The products could be efficiently transformed into functionalized bicyclo[3.2.1]octan-8-ones by a palladium-catalyzed rearrangement reaction. In case of sulfone derivatives, this rearrangement proceeds with high stereospecifity to give exclusively the endo-configured diastereomers. The bicyclo[3.2.1]octane skeleton is present
Chiral 2-Amino Alcohol Derivatives Catalyze the Enantioselective α-Chlorination of β-Ketoesters
作者:Baohua Zhang、Ruixia Guo、Sijie Liu、Lanxiang Shi、Xiaoyun Li
DOI:10.5012/bkcs.2014.35.6.1759
日期:2014.6.20
The enantioselective $\alpha}$-chlorination of cyclic $\beta}$-ketoesters catalyzed by chiral 2-aminoalcohol derivatives (2f) has been developed. For the optically active $\alpha}$-chlorinated products, the isolated yields are in the range of 85-94% and the enantiomeric excesses are up to 84% ee.