Synthesis of 3-alkyl-5-arylamino-6,11-dihydro-3H-anthra[1,2-d]-[1,2,3]triazole-6,11-dione 2-oxides by nitrosation of 3-alkylamino-5-arylamino-6H-anthra[1,9-cd]isoxazol-6-ones
摘要:
Nitrosation of 3-alkylamino-5-arylamino-6H-anthra[1,9-cd]isoxazol-6-ones with sodium nitrite in acetic acid leads to the formation of the corresponding unstable N-nitroso derivatives which are converted into 3-alkyl-5-arylamino-6,11-dihydro-3H-anthra[1,2-d][1,2,3]triazole-6,11-dione 2-oxides on heating.