Route to Benzo- and Pyrido-Fused 1,2,4-Triazinyl Radicals via <i>N</i>′-(Het)aryl-<i>N</i>′-[2-nitro(het)aryl]hydrazides
作者:Andrey A. Berezin、Georgia Zissimou、Christos P. Constantinides、Yassine Beldjoudi、Jeremy M. Rawson、Panayiotis A. Koutentis
DOI:10.1021/jo402481t
日期:2014.1.3
involves the N′-(2-nitroarylation) of easily prepared N′-(het)arylhydrazides via nucleophilic aromatic substitution of 1-halo-2-nitroarenes, which in most cases gives N′-(het)aryl-N′-[2-nitro(het)aryl]hydrazides in good yields. Mild reduction of the nitro group followed by an acid-mediated cyclodehydration gives the fused triazines, which upon alkali treatment afford the desired radicals. Fifteen examples