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
Cobalt-Catalyzed Electrophilic Aminations with Anthranils: An Expedient Route to Condensed Quinolines
作者:Jie Li、Eric Tan、Niklas Keller、Yi-Hung Chen、Peter M. Zehetmaier、Andreas C. Jakowetz、Thomas Bein、Paul Knochel
DOI:10.1021/jacs.8b11466
日期:2019.1.9
The reaction of various organozinc pivalates with anthranils provides anilines derivatives, which cyclize under acidic conditions providing condensed quinolines. Using alkenylzinc pivalates, electron-rich arylzinc pivalates or heterocyclic zinc pivalates produces directly the condensed quinolines of which several structures belong to new heterocyclic scaffolds. These N-heterocycles are of particular
Direct Synthesis of Quinolines via Co(III)-Catalyzed and DMSO-Involved C–H Activation/Cyclization of Anilines with Alkynes
作者:Xuefeng Xu、Yurong Yang、Xu Zhang、Wei Yi
DOI:10.1021/acs.orglett.7b03673
日期:2018.2.2
activation/cyclization of simple, cheap, and easily available anilines with alkynes for direct and highly efficient synthesis of privileged quinolines with exclusive regioselectivity and broad substrate/functional group tolerance and in good to excellent yields, where DMSO was employed as both the solvent and the C1 building block of quinoline products, is reported. Mechanistic experiments revealed that
The one-pot synthesis of quinolines via Co(<scp>iii</scp>)-catalyzed C–H activation/carbonylation/cyclization of anilines
作者:Xuefeng Xu、Yurong Yang、Xin Chen、Xu Zhang、Wei Yi
DOI:10.1039/c7ob02310c
日期:——
We herein disclose a novel Co(III)-catalyzed C–H activation/carbonylation/cyclization of anilines with ketones using paraformaldehyde as the carbonyl source, giving direct access to diverse quinolines with broad functional group tolerance and in good to excellent yields. Moreover, exclusive site-/region-selectivity was observed in this versatile transformation.
Quinoline Synthesis: Three component reaction of aniline, alkynes, and formaldehyde under microwave irradiation promoted by CSA led to the formation of 4‐arylated quinolines via Povarov type reaction.