Heterocyclic rearrangements. Part VI. Rearrangements of 4-acyl- and 4-iminoalkyl-benzofuroxans: new syntheses of the anthranil and indazole ring systems
作者:A. J. Boulton、P. B. Ghosh、A. R. Katritzky
DOI:10.1039/j29660001011
日期:——
4-Acyl- and 4-iminoalkyl-benzofuroxans, on preparation by nitrogen elimination from the corresponding 3-substituted 2-nitrophenyl azides, rearrange spontaneously to the anthranil and indazole ring systems. Attempts to prepare 4-alkenylbenzofuroxans failed. In 3-chloro-2-nitro- and 3-methoxy-2-nitro-benzaldehydes, the nitro-group is displaced by nucleophils in preference to the methoxy-group of chlorine
通过从相应的3-取代的2-硝基苯基叠氮化物上进行氮消除反应制得4-酰基-和4-亚氨基烷基-苯并呋喃,自发地重排至蒽和吲唑环系统。制备4-烯基苯并呋喃的尝试失败。在3-氯-2-硝基-和3-甲氧基-2-硝基-苯甲醛中,硝基被亲核试剂取代,优先于氯原子的甲氧基。