Transformation of 2-alkylamino-1,4-naphthoquinones into 2-alkylnaphtho[2,1-d][1,3]oxazole-4,5-dione 4-oximes by the action of nitrosylsulfuric acid

2-Alkylnaphtho[2,1-d][1,3]oxazole-4,5-dione 4-oximes were synthesized by reaction of 2-alkylamino-1,4-naphthoquinones with nitrosylsulfuric acid in acetic acid.