Tandem Deoxygenation/Halogenation of <i>N</i>
-Oxides Under Acylation Conditions: Scope and In Situ IR Spectroscopic Study
作者:Roman S. Malykhin、Ivan S. Golovanov、Sema L. Ioffe、Alexey Yu. Sukhorukov
DOI:10.1002/ejoc.201900131
日期:2019.7.14
Unusual acylation of 1,2‐oxazine N‐oxides with acyl bromides produces 3‐bromomethyl‐substituted 2H‐1,2‐oxazines via the formation of molecular bromine as intermediate. The developed process was successfully exploited in the stereoselective synthesis of pharmaceutically relevant molecules.
1,2-恶嗪N-氧化物与酰基溴的不寻常酰化反应会通过形成分子溴作为中间体来生成3-溴甲基-取代的2 H - 1,2-恶嗪。所开发的方法已成功地用于药物相关分子的立体选择性合成中。
A Convenient Procedure for the Synthesis of <i>N</i>-Acetyl-5,6-dihydro-2<i>H</i>-1,2-oxazines
Acetylation of 5,6-dihydro-4H-1,2-oxazines with an acetyl bromide/acetic anhydride mixture provides a general and quite simple procedure for the synthesis of N-acetyl-5,6-dihydro-2H-1,2-oxazines.