methods for one-pot transformations are highly challenging in synthetic organic chemistry. In this study, the Cu2Orhombic dodecahedra-catalyzed synthesis of 2H-indazoles is demonstrated with good to excellent yields from readily available chemicals. This one-pot procedure involves Cu2O nanoparticle-catalyzed consecutive C-N, and N-N bond formation followed by cyclization to yield 2H-indazoles with
A rhodium-catalyzed alcohol-mediated ortho-functionalization of 2-aryl-2H-indazoles through sequential C-H activation and carbenoid insertion with diazotized Meldrum's acid was developed. Using the 2H-indazole as the directing group and alcohol as the alkyl source, a series of ortho-alkylated aryl-2H-indazoles were obtained over a wide structural scope with high site-selectivity and excellent functional-group
heteroarenes are biologically active compounds and useful building blocks. In this study, we have developed a metal- and oxidant-free, environmentally friendly protocol for the regioselective selenylation of 2H-indazole derivatives by an electrochemical strategy. A number of selenylated 2H-indazoles with a wide range of functional groups have been synthesized in moderate to good yields under mild and
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
Palladium-catalyzed C–H acetoxylation of 2-arylindazoles
作者:Xu-Yan Wang、Yigao Li、Linlin Shi、Xinju Zhu、Xin-Qi Hao、Mao-Ping Song
DOI:10.1016/j.tet.2021.132277
日期:2021.7
A Pd(II)-catalyzed acetoxylation of 2H-indazoles with phenyliodine (III) diacetate (PIDA) has been successfully developed. Notably, pharmacophore 2H-indazole was utilized as an inherent directing group to access ortho-acetoxylated arylindazoles in moderate to high yields. The representative acetoxylated indazole could further undergo hydrolysis to afford the corresponding hydroxylated product.