Heterocyclic rearrangements. Part V. Rearrangement of 4-arylazo-and 4-nitroso-benzofuroxans: new syntheses of the benzotriazole and benzofurazan ring systems
作者:A. J. Boulton、P. B. Ghosh、A. R. Katritzky
DOI:10.1039/j29660001004
日期:——
4-p-Anisylazo-5-nitrobenzofuroxan rearranges spontaneously to 2-p-anisyl-4,7-dinitrobenzotriazole, whose structure is proved by n.m.r. spectroscopy. 5-Dimethylamino-4-nitrosobenzofuroxan rearranges spontaneously to 4-dimethylamino-7-nitrobenzofurazan, whose structure was proved by independent synthesis. The preparation of some derivatives of 4-aminobenzofuroxan is reported.
4-对-茴香基偶氮-5-硝基苯并呋喃喃自发地重排为2-对-茴香基-4,7-二硝基苯并三唑,其结构已通过核磁共振光谱证实。5-二甲基氨基-4-亚硝基苯并呋喃喃自发重排为4-二甲基氨基-7-硝基苯并呋喃,其结构已通过独立合成证明。报道了一些4-氨基苯并呋喃的衍生物的制备。