Herein, we describe acridine-based SNS-Ru pincer-catalysed unprecedented dehydrogenative annulation of alcohols with 2′-aminoacetophenone to synthesize 2,3-disubstituted-4-quinolones.
Transformations of N-(2-acylaryl)benzamides and their analogs under the Camps cyclization conditions
作者:S. S. Mochalov、A. N. Fedotov、E. V. Trofimova、N. S. Zefirov
DOI:10.1134/s107042801607006x
日期:2016.7
N-(2-Acylaryl)benzamides and analogous N-substituted furan-2-, thiophene-2-, and cyclopropane-carboxamides in the systems EtONa-EtOH, EtONa-THF, and t-BuOK-t-BuOH undergo Camps cyclization to 2-aryl-, 2-hetaryl-, and 2-cyclopropylquinolin-4(1H)-ones with high yields. The same substrates in the system t-BuOK (5 equiv)-THF are converted mainly to the corresponding N-(2-hydroxyaryl) amides as a result of oxidative transformation of the acyl fragment into hydroxy group.
One-Pot Synthesis of 4-Quinolone via Iron-Catalyzed Oxidative Coupling of Alcohol and Methyl Arene
作者:Seok Beom Lee、Yoonkyung Jang、Jiwon Ahn、Simin Chun、Dong-Chan Oh、Suckchang Hong
DOI:10.1021/acs.orglett.0c03011
日期:2020.11.6
Herein, we describe the iron(III)-catalyzed oxidative coupling of alcohol/methyl arene with 2-amino phenyl ketone to synthesize 4-quinolone. Alcohols and methyl arenes are oxidized to the aldehyde in the presence of an iron catalyst and di-tert-butyl peroxide, followed by a tandem process, condensation with amine/Mannich-type cyclization/oxidation, to complete the 4-quinolone ring. This method tolerates
The Brønsted acid catalytic Csp2–O amination of quinolin-4(1H)-ones with 3-alkynyl-3-hydroxyisoindolinones as animation reagents has been developed. The cascade dehydration/conjugate addition/intramolecular annulation/ring-opening reaction proceeded smoothly to afford a broad scope of aminated products with high efficiency. Furthermore, the enantioselective construction of Csp2–N atropisomers was also
开发了以 3-炔基-3-羟基异二氢吲哚酮为胺化试剂的布朗斯台德酸催化 4(1 H )-喹啉酮的 C sp2 –O 胺化反应。级联脱水/缀合加成/分子内成环/开环反应顺利进行,高效地提供了广泛的胺化产物。此外,还在手性磷酸存在下研究了 C sp2 –N 阻转异构体的对映选择性结构。重要的是,该工作不仅实现了喹啉-4( 1H )-酮的有机催化C sp2 -O胺化,而且为直接不对称合成C sp2 -N阻转异构体奠定了基础。