Synthesis of a novel heterocyclic alkylating agent has been developed. Its instability toward elevated temperatures and/or polar media can be used to prepare 8??aza??1,4??dihydrobenzo[1,3??d]oxazin ??2??one. ... Synthesis of a novel heterocyclic alkylating agent has been developed. Its instability toward elevated temperatures and/or polar media can be used to prepare 8??aza??1,4??dihydrobenzo [1,3??d]oxazin??2??one. ... Heteroatom alkylation remains a common tool for rapid “scaffold ...