A mild and efficient method for the synthesis of 3-amino-5-aryl-1,2,4-oxadiazole by intramolecular cyclization using PhI(OAc)2 (PIDA) as an oxidant is developed. Various 3-amino-5-aryl-1,2,4-oxadiazoles are prepared in moderate to good yields, and the PIDA-mediated N–O bond formation mechanism is suggested. In view of the readily available starting materials, operational simplicity, high functionality
开发了一种温和有效的方法,以PhI(OAc)2(
PIDA)为氧化剂,通过分子内环化合成3-
氨基-5-芳基-
1,2,4-恶二唑。以中等到良好的产率制备了各种3-
氨基-5-芳基-
1,2,4-恶二唑,并提出了由
PIDA介导的N–O键形成机理。鉴于容易获得的起始原料,操作简便,高功能耐受性和低毒性,该方案为
1,2,4-恶二唑提供了一种新颖的合成策略。