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
A versatile route to 2-alkyl-/aryl-amino-3-formyl- and hetero-annelated-chromones, through a facile nucleophilic substitution at C2 in 2-(N-methylanilino)-3-formylchromones
作者:Gurmit Singh、Rajinder Singh、Navdeep K Girdhar、M.P.S Ishar
DOI:10.1016/s0040-4020(02)00128-x
日期:2002.3
N-methylanilino group in 2-(N-methylanilino)-3-formylchromones, obtained in high yield by rearrangement of C(4-oxo-4H[1]-benzopyran-3-yl)-N-phenylnitrones to 2-anilino-3-formyl-chromones followed by N-methylation, undergoes facile nucleophilic substitution by a variety of nitrogen nucleophiles, thereby paving the way for synthesis of a variety of novel 2-substituted-3-formylchromone derivatives as well as hetero-annelated
Copper-Catalyzed<i>N</i>- and<i>O</i>-Arylation of Amides: Alternative Approaches to 3,4-Dihydroquinolin-2-ones, Quinolin-2-ones, and 12<i>H</i>-Chromeno[2,3-<i>b</i>]quinolin-12-ones
作者:Xinying Zhang、Xiaojie Guo、Liangliang Fang、Yunping Song、Xuesen Fan
DOI:10.1002/ejoc.201301373
日期:2013.12
The efficient syntheses of 3-cyanoquinolin-2-ones, 3-(2-bromobenzyl)-3-cyano-3,4-dihydroquinolin-2-ones, 3-(2-bromobenzyl)quinolin-2-ones, and 12H-chromeno[2,3-b]quinolin-12-ones through copper-catalyzed N- and O-arylation of amides by using readily available 2-bromobenzyl bromides and cyanoacetamides as starting materials were developed.
Thermal rearrangements of C-(4-Oxo-4H[1]benzopyran-3-yl)-N-phenylnitrone-a route to novel quinolino[2,3-b]chroman-12-ones
作者:M.P.S. Ishar、Kamal Kumar、Rajinder Singh
DOI:10.1016/s0040-4039(98)01362-8
日期:1998.9
-phenylnitrones (1a-c) undergo facile rearrangements on refluxing in benzene, yielding 2-(N-phenylamino)-4-oxo-4H[1]-benzopyran-3-carboxaldehydes (2a-c, 70%) and 3-(phenyliminomethylene)-chroman-2,4-diones (3a-c, 25%). 2a-c undergo cyclization on refluxing with anhydrous AlCl3 in dry CCl4 followed by treatment with sulfuric acid, to give novel quinolino[2,3-b]chroman-12-ones(4a-c) in 90% yield.
C-(4-Oxo-4 H [1]苯并吡喃-3-基)-N-苯基硝酮(1a-c)在苯中回流时容易进行重排,生成2-(N-苯基氨基)-4-oxo-4 H [1]-苯并吡喃-3-羧醛(2a-c,70%)和3-(苯基亚氨基亚甲基)-色氨酸-2,4-二酮(3a-c,25%)。2a-c在无水AlCl 3中在无水CCl 4中回流后进行环化,然后用硫酸处理,以90%的收率得到新型喹啉[2,3 - b ] chroman-12-ones(4a-c)。
Bandyopadhyay, Chandrakanta; Sur, Kumar Ranabir; Patra, Ranjan, Journal of Chemical Research, Miniprint, 2003, # 8, p. 847 - 856