Synthesis and Electrochemical Behaviour of 2-N-Substituted Indazoles.
摘要:
A new 2-N-aryl-3-methoxycarbonylindazole synthesis from the 6 F mol(-1) reduction of appropriately substituted aryl-nitrones has been developed. The indazoles bearing an electron withdrawing group in the 2-position are electroreducible compounds at high negative potentials producing selectively the corresponding 2-N-substituted indazolines in aqueous alcoholic medium. The nitrile and ester groups are not reduced under the reaction conditions. Three new 2-N-aryl-indazolines were synthesized and characterized. A second electron withdrawing group attached at the 3-position leads to a less cathodic reduction of the 2-N-aryl-3-methoxycarbonylindazole. An appropriately substituted indazoline was used to generate ill situ a new tetracyclic heterocycle.
Synthesis and Electrochemical Behaviour of 2-N-Substituted Indazoles.
摘要:
A new 2-N-aryl-3-methoxycarbonylindazole synthesis from the 6 F mol(-1) reduction of appropriately substituted aryl-nitrones has been developed. The indazoles bearing an electron withdrawing group in the 2-position are electroreducible compounds at high negative potentials producing selectively the corresponding 2-N-substituted indazolines in aqueous alcoholic medium. The nitrile and ester groups are not reduced under the reaction conditions. Three new 2-N-aryl-indazolines were synthesized and characterized. A second electron withdrawing group attached at the 3-position leads to a less cathodic reduction of the 2-N-aryl-3-methoxycarbonylindazole. An appropriately substituted indazoline was used to generate ill situ a new tetracyclic heterocycle.
2-Substituted indazoles from electrogenerated ortho-nitrosobenzylamines
作者:Bernardo A. Frontana-Uribe、Claude Moinet
DOI:10.1016/s0040-4020(98)00058-1
日期:1998.3
An electrochemical methodology for an efficient access to ortho-nitrosobenzylamines has been developed. These products cyclize intramolecularly producing the desired 2-substituted indazoles in high yields. The electrochemical procedure overcomes limitations of previous chemical methods. (C) 1998 Elsevier Science Ltd. All rights reserved.