A Metal-Free Amination of Benzoxazoles – The First Example of an Iodide-Catalyzed Oxidative Amination of Heteroarenes
作者:Tanja Froehr、Christian P. Sindlinger、Ulrich Kloeckner、Peter Finkbeiner、Boris J. Nachtsheim
DOI:10.1021/ol201439t
日期:2011.7.15
An efficient transition-metal-free amination of benzoxazoles has been developed. With catalytic amounts of tetrabutylammoniumiodide (TBAI), aqueous solutions of H2O2 or TBHP as co-oxidant and undermild reaction conditions, highly desirable 2-aminobenzoxazoles were isolated in excellent yields of up to 93%. First mechanistic experiments indicate the in situ iodination of the secondary amine as the
已经开发出有效的无过渡金属苯并恶唑胺化的方法。用催化量的四丁基碘化铵(TBAI),H 2 O 2或TBHP水溶液作为助氧化剂,并在温和的反应条件下,以高达93%的优异收率分离出了非常理想的2-氨基苯并恶唑。最初的机械实验表明,仲胺的原位碘化是假定的活化方式。
Copper-Catalyzed Electrophilic Amination of Benzoxazoles via Magnesation
作者:Sangback Lee、Yunmi Lee
DOI:10.1002/ejoc.201900335
日期:2019.5.26
A mild and efficient method for the synthesis of 2‐aminobenzoxazoles through a Cu‐catalyzed electrophilicamination of benzoxazole derivatives with O‐benzoyl hydroxylamines by direct magnesation has been developed.
One-pot synthesis of 2-aminobenzoxazole derivatives using acetic acid as an electrolyte under electrochemical conditions
作者:Tanay Ghoshal、Tarun M. Patel
DOI:10.1007/s13738-021-02184-1
日期:2021.9
ammoniumbromide, sodium iodide and lithium perchlorate, but in this conversion we have removed the use of all supportingelectrolytes and we have usedaceticacid, which plays a dual role of opening the benzoxazole moiety and works as an electrolyte. All these electrochemical conversions were done on a electrochemical reactor prepared through a 5v mobile charger having a output current density of 0.35A.cm−2. Various