iReactions iof i4H-3,1-benzoxazin-4-one i3 iwith ivarious initrogen inucleophiles; isodium iazide, ihydroxylamine ihydrochloride, iammonium iacetate, iand iformamide iafforded inew iNheterocyclic icompounds i4-7.iThe isynthesized iquinazolinone iderivative i7 iwas iused ias ia iuseful ibuilding iblock ifor ifurther isynthesis iof inew iseries iof iN3-functionalized iquinazolinone icompounds i8-12....