Abstract

Nitration (HNO 3/H 2SO 4) of oxindole gave 3,3,5,7-tetranitrooxindole ( 1c), which readily underwent ring-opening and decarboxylation to 4,6-dinitro-2-(dimtromclhyl)aniline ( 4b), which in turn could be cyclized to 3,5,7-triniuoindazole (5).

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