Twenty six propargylamine mycophenolate analogues were designed and synthesized from mycophenolicacid 1 employing a key step A3-coupling reaction. Their cytotoxic activity was examined against six cancer cell lines. Compounds 6a, 6j, 6t, 6u, and 6z exhibited selective cytotoxicity towards neuroblastoma (SH-SY5Y) cancer cells and were less toxic to normal cells in comparison to the lead compound, MPA
Cu-Catalyzed Aerobic Oxidation of Di-<i>tert</i>-butyl Hydrazodicarboxylate to Di-<i>tert</i>-butyl Azodicarboxylate and Its Application on Dehydrogenation of 1,2,3,4-Tetrahydroquinolines under Mild Conditions
作者:Dahyeon Jung、Min Hye Kim、Jinho Kim
DOI:10.1021/acs.orglett.6b03166
日期:2016.12.16
developed with homogeneous CuI and di-tert-butyl azodicarboxylate for aerobic dehydrogenation of 1,2,3,4-tetrahydroquinolines under mild conditions. The developed co-catalytic system is consisting of di-tert-butyl azodicarboxylate-mediated dehydrogenation of 1,2,3,4-tetrahydroquinoline and aerobic oxidative regeneration of di-tert-butyl azodicarboxylate from di-tert-butyl hydrazodicarboxylate using molecular
DMSO/<i>t</i>-BuONa/O<sub>2</sub>-Mediated Aerobic Dehydrogenation of Saturated <i>N</i>-Heterocycles
作者:Ruchun Yang、Shusheng Yue、Wei Tan、Yongfa Xie、Hu Cai
DOI:10.1021/acs.joc.9b03447
日期:2020.6.5
Aromatic N-heterocycles such as quinolines, isoquinolines, and indolines are synthesized via sodium tert-butoxide-promoted oxidative dehydrogenation of the saturated heterocycles in DMSO solution. This reaction proceeds under mild reaction conditions and has a good functional group tolerance. Mechanistic studies suggest a radical pathway involving hydrogen abstraction of dimsyl radicals from the N–H
A concise synthesis of quinolinium, and biquinolinium salts and biquinolines from benzylic azides and alkenes promoted by copper(<scp>ii</scp>) species
copper-promoted cycloaddition reaction also allows biquinoline products to be obtained from ortho-substituted benzylic azides. These reactions work well with both terminal and internal alkenes. Unsymmetrical internal alkene reactions proceed with high regioselectivity. The reaction is likely started by Lewis acidic CuII-assisted rearrangement of benzylic azide to N-methyleneaniline, followed by a [4 + 2] cycloaddition
Iron(II)‐Catalyzed Aerobic Biomimetic Oxidation of N‐Heterocycles
作者:Srimanta Manna、Wei‐Jun Kong、Jan‐E. Bäckvall
DOI:10.1002/chem.202102483
日期:2021.10
Herein, an iron(II)-catalyzed biomimetic oxidation of N-heterocycles under aerobic conditions is described. The dehydrogenation process, involving several electron-transfer steps, is inspired by oxidations occurring in the respiratory chain. An environmentally friendly and inexpensive iron catalyst together with a hydroquinone/cobalt Schiff base hybrid catalyst as electron-transfer mediator were used