A silver catalyzed domino reaction of N -cyanamide alkenes and 1,3-dicarbonyls for the synthesis of quinazolinones

A silver catalyzed domino reaction of N-cyanamide alkenes and 1,3-dicarbonyls including 1,3-diketones and ethyl acetoacetate has been developed for the facile synthesis of quinazolinones. In the presence of AgNO3/K2S2O8, the diketones could be converted to radicals and coupled with N-cyanamide alkenes to undergo a cyclization cascade for accessing quinazolinones. This method features mild reaction conditions, readily available starting materials, and valuable synthetic utility. Moreover, the products could be further transformed into various heterocycles.