[EN] SMALL MOLECULE ACTIVATORS OF NICOTINAMIDE PHOSPHORIBOSYLTRANSFERASE (NAMPT) AND USES THEREOF [FR] ACTIVATEURS À PETITES MOLÉCULES DE NICOTINAMIDE PHOSPHORIBOSYLTRANSFÉRASE (NAMPT) ET LEURS UTILISATIONS
Rhodium(III)-Catalyzed Indazole Synthesis by C–H Bond Functionalization and Cyclative Capture
摘要:
An efficient, one-step, and highly functional group-compatible synthesis of substituted N-aryl-2H-indazoles is reported via the rhodium(III)-catalyzed C-H bond addition of azobenzenes to aldehydes. The regioselective coupling of unsymmetrical azobenzenes was further demonstrated and led to the development of a new removable aryl group that allows for the preparation of indazoles without N-substitution. The 2-aryl-2H-indazole products also represent a new class of readily prepared fluorophores for which initial spectroscopic characterization has been performed.
Microwave assisted solvent-free CH amination by silica-supported manganese dioxide
作者:Sufen Cao、Wenhu Duan
DOI:10.1016/j.tetlet.2016.04.061
日期:2016.6
An effective and convenient method has been developed for the preparation of 1-unsubstituted 1H-indazoles via CH amination of N-acetylhydrazones in the presence of a catalytic amount of manganesedioxide under microwave irradiation. This newmethod featured easy operation and relatively short reaction-time.
Synthesis of dihydroindazolo[2,3-<i>f</i>]phenanthridin-5(6<i>H</i>)-ones <i>via</i> Rh(<scp>iii</scp>)-catalyzed C–H activation of 2-aryl indazoles and annulation with iodonium ylides
An efficient syntheticroute to indazole-fused dihydrophenanthridinones in excellent to almost quantitative yields under mild reaction conditions was developed. The reaction utilizes the acid-controlled Rh(III)-catalyzed C–H activation of 3-arylindazoles followed by their annulation with readily available hypervalent iodonium ylides. This methodology afforded a wide range of products that could be
开发了一种在温和反应条件下以优异至几乎定量的产率合成吲唑稠合二氢菲啶酮的有效合成路线。该反应利用酸控制的 Rh( III ) 催化的 3-芳基吲唑的 C-H 活化,然后用现成的高价碘鎓叶立德进行环化。这种方法提供了广泛的产品,只需简单的过滤即可分离,无需柱层析。此外,催化体系可以循环使用至少八次,收率很高,这可能使其适合工业生产。此外,合成的二氢吲唑并[2,3 - f ]phenanthridin-5(6 H)-表示它们可能具有作为新型荧光材料的潜在应用。
Rhodium‐Catalysed Selective C−H Allylation of 1<i>H</i>‐Indazoles with Vinylethylene Carbonate: Easily Introducing Allylic Alcohol
作者:Xiang Zhao、Junwei Huang、Yadong Feng、Xiuling Cui
DOI:10.1002/ejoc.202300823
日期:2023.10.21
An efficient rhodium(III)-catalyzed C−H bond activation/allylation reaction of 3-aryl-1H-indazoles with easily available vinylethylene carbonate has been reported. A series of allyl alcohol substituted 3-aryl-1H-indazoles were obtained.