Switchable Synthesis of 3-Substituted 1H-Indazoles and 3,3-Disubstituted 3H-Indazole-3-phosphonates Tuned by Phosphoryl Groups
Guihua Chen, Minglin Hu and Yungui Peng*
*Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, P. R. China, Email: pygswu.edu.cn
G. Chen, M. Hu, Y. Peng, J. Org. Chem., 2018, 83, 1591-1597.
1,3-Dipolar cycloaddition reactions between α-substituted α-diazomethylphosphonates and arynes provide 3-alkyl/aryl-1H-indazoles and 3-alkyl/aryl-3H-indazole-3-phosphonates efficiently under simple reaction conditions. The phosphoryl group acted both as a tuning group and a traceless group.
see article for more examples
indazoles, 1,3-dipolar cycloaddition