We report a novel and practical one-pot Rh(III)-catalyzed strategy to construct benzimidazo[1,2-a]quinolines from readily available imidamides and anthranils. The cascade reaction proceeds via a C-H amination-cyclization-cyclization process in ionic liquid without any additives and possesses simple operation, moderate-to-high yield, and broad substrate scope features, which will provide the reference
Catalyst-free cyclization of anthranils and cyclic amines: one-step synthesis of rutaecarpine
作者:Jian Li、Zheng-Bing Wang、Yue Xu、Xue-Chen Lu、Shang-Rong Zhu、Li Liu
DOI:10.1039/c9cc06160f
日期:——
An efficient synthesis of a variety of quinazolinone derivatives via a direct cyclization reaction between commercially available anthranils and cyclic amines is described. The developed transformation proceeds with the merits of high step- and atom-efficiency, a broad substrate scope, and good to excellent yields, without additional catalysts, and offers a practical way for the preparation of rutaecarpine
source have been employed for the first time to enable direct amination on unactivatedC(sp3)–Hbonds of thioamides under Cp*CoIII catalysis. The excellent site-selectivity on primary C(sp3)–Hbonds is observed for a diverse array of thioamides with high functional group tolerance. Further applicability of the products is also highlighted through a series of interesting synthetic elaborations.
具有合成功能的邻氨基苯甲酸酯作为双功能氨基源已被首次使用,能够在Cp * Co III催化下直接胺化未活化的硫代酰胺的C(sp 3)-H键。对于具有高官能团耐受性的各种硫酰胺,可以观察到对主要的C(sp 3)–H键具有出色的位点选择性。通过一系列有趣的合成细节也突出了产品的进一步适用性。