Zur Herstellung von 1,2,3-Tricarbonylverbindungen aus 1,3-Dicarbonylverbindungen. 27. Mitteilung über Reduktone und Tricarbonylverbindungen [1]
作者:Francis Dayer、Huu Lê Dao、Hellmut Gold、Heike Rodé-Gowal、Hans Dahn
DOI:10.1002/hlca.19740570736
日期:1974.11.6
The synthesis of 22 substituted tricarbonyl compounds is reported. They were obtained either by oxidation of β-dicarbonyl compounds with SeO2 or nitrous oxides or by oxidation of the α-bromo-β-dicarbonyl compounds with DMSO. The procedures using SeO2 or DMSO are more rapid and give in general better yields than other methods described in the literature.
A novel gold(I)-catalyzed protocol for the synthesis of 4H-1,3-dioxin-3-ones is presented. The protocol exploits a metal induced cascade sequence involving a [3,3]-sigmatropic rearrangement followed by regioselective O-annulation reactions. A wide range of oxygen-based heterocyclic scaffolds (21 examples) were achieved in excellent yield (up to 80%) and a detailed computational investigation as well
提出了一种新颖的金(I)催化方案,用于合成4 H -1,3-二恶英-3-酮。该协议利用了金属诱导的级联序列,该序列涉及[3,3]-σ重排,然后进行区域选择性的O-环化反应。以优异的收率(高达80%)获得了多种基于氧的杂环支架(多达21个实例),详细的计算研究以及氘标记研究使得所有可能的反应途径都得以绘制,并使反应路线合理化。记录的区域选择性。
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。
Azomethine Dyes. II. Color and Constitution of Acylacetamide Azomethine Dyes
作者:G. H. Brown、J. Figueras、R. J. Gledhill、C. J. Kibler、F. C. McCrossen、S. M. Parmerter、P. W. Vittum、A. Weissberger
DOI:10.1021/ja01568a062
日期:1957.6
Wenzel, Monatshefte fur Chemie, 1914, vol. 35, p. 948