Fries; Koch; Stukenbrock, Justus Liebigs Annalen der Chemie, 1929, vol. 468, p. 188
作者:Fries、Koch、Stukenbrock
DOI:——
日期:——
Iron-Catalyzed Regioselective Synthesis of 2-Arylbenzoxazoles and 2-Arylbenzothiazoles via Alternative Reaction Pathways
作者:Martyn C. Henry、Vincenzo Mirco Abbinante、Andrew Sutherland
DOI:10.1002/ejoc.202000014
日期:2020.5.22
A one‐pot regioselective method for the preparation of 2‐arylbenzoxazoles from N‐arylbenzamides has been developed using iron(III)‐catalyzed bromination of the aryl ring, followed by copper(I)‐catalyzed O‐cyclization with the benzamide side chain. In contrast, reaction of N‐arylthiobenzamides with N‐bromosuccinimide and iron triflimide led directly to the isolation of the corresponding 2‐arylbenzothiazoles
已经开发了一种从 N-芳基苯甲酰胺制备 2-芳基苯并恶唑的单锅区域选择性方法,使用铁(III)催化芳环溴化,然后铜(I)催化与苯甲酰胺侧链 O-环化。相反,N-芳基硫代苯甲酰胺与N-溴代琥珀酰亚胺和三氟甲磺酸亚铁的反应直接通过分子内C-S键形成分离出相应的2-芳基苯并噻唑。机理和控制实验表明,在这种情况下,溴化发生在硫原子上,产生可以进行亲电芳香取代和 S 环化的反应性中间体。探索了这两个过程的范围,产生了一系列结构类似物,