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 new cascade reaction: concurrent construction of six and five membered rings leading to novel fused quinazolinones
作者:K. Siva Kumar、P. Mahesh Kumar、V. Sreenivasa Rao、Ahamed A. Jafar、Chandana Lakshmi T. Meda、R. Kapavarapu、Kishore V. L. Parsa、Manojit Pal
DOI:10.1039/c2ob25296a
日期:——
A one-pot cascade reaction has been developed leading to the concurrent construction of six and five membered fused N-heterocyclic rings of indazolo[3,2-b]quinazolinones. The methodology involved the reaction of isatoic anhydride, a hydrazine and o-iodo benzaldehyde in the presence of Pd(PPh3)4 and BINAP in MeCN. The mechanism of this cascade reaction is discussed. A variety of indazolo[3,2-b]quinazolinone derivatives were prepared by using this methodology in good yields, some of which were tested for their PDE4 inhibitory properties in vitro. The dose response and docking study performed using a representative compound is presented.
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。