Synthess of 2H-1,2,3-Triazolo[4,5-d]pyrimidine-5,7-diones from uracils using cyclization reaction of beta-Azo-alpha,beta-unsaturated sulfilimines

摘要

N-(Uracil-6-yl)-S,S-diphenylsulfilimine(1) prepared from uracils reacted with aryldiazonium salts to give N-(5-arylazouracil-6-yl)-S,S-diphenylsulfilimines(2),beta-azo-alpha,beta-unsaturated sulfilimines,in good yields.The azo sulfilimines (2) were converted on thermolysis into the corresponding 2H-1,2,3-triazolo-[4,5-d]pyrimidine-5,7-diones(3) in good yields.