Reaction of 1-amino-2-phenylethynyl- and 2-acylethynyl-1-amino-9,10-anthraquinones with HNO2. Synthesis of 1H-3-acylnaphtho[2,3-g]indazole-6,11-diones

Article abstract of DOI:10.1007/BF02495357

The reactions of 1-amino-2-phenylethynyl- and 2-acylethynyl-1-amino-9,10-anthraquinones with HNO₂ in a mixture of dioxane and a mineral acid at 20°C were studied. Under these conditions, 2-alkynyl-1-amino-9,10-anthraquinones, irrespective of th