Copper-catalyzed direct coupling of benzoxazin-2-ones with indoles for the synthesis of diverse 3-indolylbenzoxazin-2-ones: access to natural cephalandole A
作者:Rameshwar Prasad Pandit、Jae-Jin Shim、Sung Hong Kim、Yong Rok Lee
DOI:10.1039/c7ra10634c
日期:——
A novel and facile copper-catalyzeddirect coupling for the synthesis of diverse and functionalized 3-indolyl benzoxazin-2-ones from benzoxazin-2-ones and indoles has been developed. This new methodology offers an easy and rapid approach to a variety of 3-indolylbenzo[b][1,4]oxazin-2-ones in high yield. As an application of this protocol, a gram-scale synthesis of naturally occurring cephalandole A
已经开发了一种新颖且容易的铜催化直接偶联反应,用于从苯并恶嗪-2-酮和吲哚合成各种功能化的3-吲哚基苯并恶嗪-2-酮。这种新方法为高产率地制备各种3-吲哚基苯并[ b ] [1,4]恶嗪-2-酮提供了一种简便快捷的方法。作为该方案的应用,还已经完成了天然存在的头孢烯酮A的克级合成。
Transition-Metal-Free Alkylation and Acylation of Benzoxazinones with 1,4-Dihydropyridines
作者:Youjung Byun、Junghyea Moon、Won An、Neeraj Kumar Mishra、Hyung Sik Kim、Prithwish Ghosh、In Su Kim
DOI:10.1021/acs.joc.1c01558
日期:2021.9.3
vital transformation for the development of pharmaceuticals, functional materials, and other chemical entities. Herein, the transition-metal-free alkylation and acylation of C(sp2)–H bonds in biologically relevant 2-benzoxazinones with 1,4-dihydropyridines as readily accessible radical surrogates is described. Excellent functional group compatibility and a broad substrate scope were attained. Gram-scale
Silver-catalyzed cross-dehydrogenative coupling of benzoxazine-2-ones with resorcinol
作者:Yumi Kang、Soomin Jeon、Hayoung Kim、Jonghyeok Han、Garam Choi、Eun-Kyu Sun、Rameshwar Prasad Pandit、Tae-Hyun Kim
DOI:10.1016/j.tetlet.2022.154184
日期:2022.11
Silver-catalyzed cross-dehydrogenative coupling of benzoxazin-2-ones with resorcinol is reported. This method provides an easy and direct C3-arylation of benzoxazin-2-ones at ambient condition at the expenses of inexpensive ammonium persulfate as an oxidant. A radical pathway has been proposed for the transformation.
B(C6F5)3/Chiral Phosphoric Acid Catalyzed Asymmetric Aza-Diels–Alder Reaction of Imines and Unactivated Dienes
作者:Zhen Liu、Qing-Chun Qian、Li-Ming Chen、Xin Li
DOI:10.1021/acs.orglett.4c00874
日期:2024.4.19
Herein, we report an asymmetric aza-Diels–Alderreaction of quinoxalinones or benzoxazinones with unactivated dienes by utilizing a B(C6F5)3/chiral phosphoric acid catalyst to construct chiral six-membered N-heterocycles. Various quinoxalinones or benzoxazinones with electron-withdrawing and electron-donating groups and unactivated dienes were tolerated (up to 99% yield and 99% ee) in the methodology