Gold-catalyzed cyclization of unconjugated ynone derivatives for 2H-1,2-oxazine and 1-hydroxypyrrole skeletons through one-pot and single-step strategy
Fe(II)/Au(I) Relay Catalyzed Propargylisoxazole to Pyridine Isomerization: Access to 6-Halonicotinates
作者:Alexey V. Galenko、Firuza M. Shakirova、Ekaterina E. Galenko、Mikhail S. Novikov、Alexander F. Khlebnikov
DOI:10.1021/acs.joc.7b00736
日期:2017.5.19
An efficient synthesis of methyl nicotinates/6-halonicotinates by the domino isomerization of 4-propargyl/(3-halopropargyl)-5-methoxyisoxazoles under Fe(II)/Au(I) relay catalysis was developed. It was found that FeNTf2 is an effective catalyst for first step of the domino isomerization, transformation of isoxazole to 2H-azirine, which is compatible with Ph3PAuNTf2, catalyzing the second step.
Über neuartige, basisch substituierte Pyrazolon-Derivate. Untersuchungen über synthetische Arzneimittel. 3. Mitteilung
作者:A. Ebnöther、E. Jucker、A. Lindenmann
DOI:10.1002/hlca.19590420415
日期:——
Es werden neue Pyrazol-5-on-Derivate beschrieben, die in 1-Stellung durch einen Piperidyl-(4)- oder Dialkylaminoalkyl-Rest substituiert sind. Einzelne dieser Verbindungen zeichnen sich bei hervorragender Wasserlöslichkeit ihrer Hydrochloride durch gute analgetische und antipyretische Wirkungen Bus.
A one-potstrategy for the synthesis of 3-hydroxy-3-furylisoindolinone derivatives is reported. The reaction proceeds via a copper-catalyzed oxidative cascade inter-molecular double cyclization of 2-iodobenzamide derivatives and propargyl dicarbonyl compounds in the presence of oxygen. The strategy involves several reactions including cyclization/coupling/double C(sp3)−H functionalization in a cascade
A Golden Synthetic Approach to 2-(1H-Pyrrol-1-yl)anilines and Pyrrolo[1,2-a]quinoxalines through a Gold Carbene Intermediate
作者:Nurettin Menges、Volkan Tasdemir、Hasan Genç
DOI:10.1055/a-2159-9400
日期:2024.4
The pyrrolo[1,2-a]quinoxaline skeleton has significant potential for many biological and optical applications. Hence, in this study, unconjugated ynone derivatives were treated with 1,2-diaminoarenes in a gold-catalyzed cyclization to give 2-(1H-pyrrol-1-yl)anilines, which are valuable starting materials, and pyrrolo[1,2-a]quinoxalines by a one-pot and single-step approach. A reaction mechanism for the
吡咯并[1,2-a]喹喔啉骨架在许多生物和光学应用中具有巨大的潜力。因此,在本研究中,在金催化环化中用 1,2-二氨基芳烃处理非共轭炔酮衍生物,得到 2-(1 H-吡咯-1-基)苯胺(这是有价值的起始原料)和吡咯[1,通过一锅单步方法制备2- a ]喹喔啉。提出了以关键金卡宾中间体为特征的吡咯并[1,2- a ]喹喔啉骨架形成的反应机理。另一方面,2-(1H-吡咯-1-基)苯胺的C-2位甲基被SeO 2氧化,得到吡咯并[1,2- a ]喹喔啉骨架,得到14 种不同的吡咯并[1,2- a ]喹喔啉衍生物。