开发了一种新颖实用的铜催化方法制备5-芳基吲哚并[3,2 - b ]喹唑啉-7(5 H)-ones。通过使等角酸酐与芳基肼反应,可以容易地制备2-氨基-N'-芳基苯并肼。然后,在CuI的存在下,通过2-硝基苯甲醛的缩合/分子内环化反应,以高收率产生了相应的5-芳基吲唑并[3,2 - b ]喹唑啉-7(5 H)-。
of a copper-catalyzed halogen-free protocol to construct indazolo[3,2-b]quinazolinones was developed through sequential inert C–O bondcleavage followed by intramolecular C–N bond formation. This protocol represents an efficient synthetic tool for accessing a more diverse range of functionalized indazolo[3,2-b]quinazolinones. The structure of the newly synthesized indazolo[3,2-b]quinazolinones was unambiguously
通过依次进行惰性C–O键裂解和随后的分子内C–N键形成过程,开发了构建铜吲哚并[3,2- b ]喹唑啉酮的铜催化无卤方案的第一个实例。该协议代表了一种有效的合成工具,可用于获得更多种类的功能化吲唑并[3,2- b ]喹唑啉酮。通过X射线晶体衍射分析明确地确认了新合成的吲唑并[3,2- b ]喹唑啉酮的结构。
A palladium-catalyzed intramolecular aerobic oxidative C-H amination of 2-aryl-3-(arylamino)quinazolinones has been developed, providing a variety of substituted indazolo[3,2-b]quinazolinone derivatives in moderate to excellent yields. Preliminary mechanistic studies suggested that a palladacycle dimer could be the key intermediate, which underwent a cascade "rollover" cyclometalation and C-H amination sequence. Furthermore, the potential utility of these products has been demonstrated as a new class of blue fluorophores for fluorescent materials.