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.
A copper-mediated formal [5 + 1] oxidative annulation of 2-vinylanilines and glyoxylic acid to 4-arylated quinolines was developed. A series of 4-arylated quinoline derivatives were obtained in good to excellent yields. This protocol could be carried out efficiently on gram scale. The transformation probably underwent nucleophilic addition/6π electrocyclization/oxidative aromatization and the elimination
Tertiary amines as a C1 synthon: metal-free synthesis of quinolines and 2-substituted quinolines <i>via</i> [3+2+1] aerobic cyclization and C–N bond cleavage
An I2-mediated [3+2+1] aerobic cyclization reaction of anilines with alkynes and tertiaryamines without any peroxides has been reported. This protocol employed tertiaryamines as a C1 building block for the direct synthesis of 2-non, 2-alkyl, and even 2-aryl substituted quinolines via C–N bond cleavage. Differing from the traditional methods, both terminal and internal alkynes were compatible in this
已经报道了在没有任何过氧化物的情况下, I 2介导的苯胺与炔烃和叔胺的 [3+2+1] 有氧环化反应。该方案采用叔胺作为 C1 结构单元,通过C-N 键断裂直接合成 2-非、2-烷基甚至 2-芳基取代的喹啉。与传统方法不同,末端和内部炔烃在这种无金属三组分体系中是相容的。2-乙烯基苯胺可能作为该过程中的一种活性中间体产生。