Highly regioselective organo photocatalysis of 4CzIPN (1,2,3,5-tetrakis(carbazol-9-yl)-4,6-dicyanobenzene) for the arylation of 2H-indazole is demonstrated.
作者:Stephan A. Ohnmacht、Andrew J. Culshaw、Michael F. Greaney
DOI:10.1021/ol902537d
日期:2010.1.15
The efficient palladium-catalyzed synthesis of a range of substituted 2H-Indazoles via C−H arylation is reported. Reactions are performed on water and provide a direct and mild route toward 2,3-diaryl indazoles of widespread biological significance.
Continuous‐Flow Visible Light Organophotocatalysis for Direct Arylation of 2
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‐Indazoles: Fast Access to Drug Molecules
作者:Shinde Vidyacharan、Bandaru T. Ramanjaneyulu、Seungwook Jang、Dong‐Pyo Kim
DOI:10.1002/cssc.201900736
日期:2019.6.21
A continuous‐flow homogeneous photocatalytic method has been devised for the direct arylation of 2H‐indazoles. This visible‐light‐promoted approach directly accesses a wide range of structurally diverse C3‐arylated scaffolds of biological interest in a fast (1 min), single‐step reaction by using eosin Y as an organophotocatalyst. Furthermore, a microreactor technology is also employed for the fast
Cobalt(III)-Catalyzed Synthesis of Indazoles and Furans by C–H Bond Functionalization/Addition/Cyclization Cascades
作者:Joshua R. Hummel、Jonathan A. Ellman
DOI:10.1021/ja5116452
日期:2015.1.14
reported heterocycle syntheses also demonstrate the use of directing groups that have not previously been applied to Co(III)-catalyzedC–H bond functionalizations. Additionally, the synthesis of furans demonstrates the first example of Co(III)-catalyzedfunctionalization of alkenyl C–H bonds.
The Mills reaction and cyclization of readily available 2‐aminobenzyl alcohols and nitrosobenzenes using thionyl bromide provided 2H‐indazoles in up to 88 % yields. In the metal‐free process, acetic acid played a crucial role for the both Mills reaction and cyclization. A brominated 2H‐indazole could also be obtained through the one‐pot sequence.