[EN] HETEROARYL COMPOUNDS USEFUL AS INHIBITORS OF SUMO ACTIVATING ENZYME [FR] COMPOSÉS HÉTÉROARYLE UTILES EN TANT QU'INHIBITEURS DE L'ENZYME D'ACTIVATION SUMO
[EN] HETEROARYL COMPOUNDS USEFUL AS INHIBITORS OF SUMO ACTIVATING ENZYME [FR] COMPOSÉS HÉTÉROARYLE UTILES EN TANT QU'INHIBITEURS DE L'ENZYME D'ACTIVATION SUMO
A highly efficient catalytic asymmetric synthesis of 1,1-disubstituted tetrahydroisoquinolines has been achieved via asymmetric alkylation or Michael addition of 1-cyanotetrahydroisoquinolines using binaphthyl-modified N-spiro-type chiral phase-transfer catalysts.
Facile Synthesis of 3-Substituted Thiazolo[2,3-α]tetrahydroisoquinolines
作者:Sheng-Han Huang、Wan-Yu Huang、Guo-Lun Zhang、Te-Fang Yang
DOI:10.3390/molecules26206126
日期:——
It was found that 4-hydroxy-2-butenoic ester (11) could not react with 3,4-dihydro-isoquinoline (4a). Individual addition reactions of γ-mercapto-α,β-unsaturated esters (18) and -unsaturated amide (19) with 3,4-dihydroisoquinolines (4) were carried out under appropriate conditions to provide the corresponding thiazolo[2,3-α]isoquinoline derivatives with good yields (up to 87%) and significant diastereomeric
omnipresent in biologically active molecules. Here we report on the direct asymmetric synthesis of these valuable compounds via the reaction of 3,4-dihydroisoquinolinium tetraarylborates. The dualroles of anionic tetraarylborates, which function as both prenucleophiles and stabilizers of 3,4-dihydroisoquinolinium cations, enable this rhodium(I)-catalyzed protocol to convergently provide enantioenriched 1-aryl
Aza-Nazarov Cyclization Reactions via Anion Exchange Catalysis
作者:Selin E. Donmez、Emine Soydaş、Gökçen Aydın、Onur Şahin、Uğur Bozkaya、Yunus E. Türkmen
DOI:10.1021/acs.orglett.8b03886
日期:2019.1.18
α-methylene-γ-lactam products in good yields (up to 79%) as single diastereomers. The reactions proceed efficiently when AgOTf is used as an anion exchange catalyst with a 20 mol % loading at 80 °C. Computational studies were performed to investigate the reaction mechanism, and the findings support the role of the −TMS group in reducing the reaction barrier of the key cyclization step.
Enantioselective synthesis of spirooxindole benzoquinolizines via organo-catalyzed cascade reactions
作者:Yu Tan、Er-Lu Feng、Qiang-Sheng Sun、Hua Lin、Xun Sun、Guo-Qiang Lin、Xing-Wen Sun
DOI:10.1039/c6ob02157c
日期:——
A Michael–Mannich–hemiaminalization–dehydration cascade reaction was developed for the construction of spirooxindole benzoquinolizine derivatives. Additionally, spirooxindole benzoindolizidine was prepared conveniently through a ring-contracted rearrangement reaction fromspirooxindole benzoquinolizine.