Single‐Step Modular Synthesis of Unsaturated Morpholine
<i>N</i>
‐Oxides and Their Cycloaddition Reactions
作者:Jongwoo Son、Ki Hwan Kim、Dong‐Liang Mo、Donald J. Wink、Laura L. Anderson
DOI:10.1002/anie.201611791
日期:2017.3.6
A single‐flask procedure for the generation of α‐keto‐N‐alkenylnitrones through a Chan–Lam coupling and subsequent spontaneous 6π electrocyclization of these intermediates for the synthesis of 2H‐1,4‐oxazine N‐oxides has been developed for a variety of α‐ketooximes and alkenylboronic acids. This transformation provides a new approach to C‐substituted unsaturated morpholine derivatives that are poised
为的α酮的生成单烧瓶过程Ñ -alkenylnitrones通过浐榄耦合和这些中间体的后续自发6πelectrocyclization 2的合成ħ -1,4-恶嗪Ñ -oxides已为开发各种α-酮肟酸和烯基硼酸。这种转变为C取代的不饱和吗啉衍生物提供了一种新方法,该衍生物准备进行进一步的功能化,以制备各种新颖的杂环结构。除了描述这些新杂环中间体的环加成反应性的初步研究之外,还讨论了合成2 H -1,4-恶嗪N-氧化物的新方法的范围。