An unusual I2‐mediated triple C(sp3)−H functionalization reaction between aryl methyl ketones and dimethyl sulfoxide to form polysubstituted furans has been developed. In this transformation, dimethyl sulfoxide functions as a dual synthon via C(sp3)−H functionalization with formation of two C−C bonds, one C−O bond, and one C−Sbond in a one‐step process. Iodine is crucial as promoter of the reaction
Making Flavone Thioethers Using Halides and Powdered Sulfur or Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub>
作者:Qiujie Tang、Zhaogang Bian、Wei Wu、Jin Wang、Ping Xie、Charles U. Pittman、Aihua Zhou
DOI:10.1021/acs.joc.7b01320
日期:2017.10.6
C–S bonds is very important in organic synthesis. Here a new sulfenylation method to generate flavone thioether derivatives was developed by employing aromatic or alkyl halides, S powder and Na2S2O3 as reactants. Good yields of regioselective Calkyl–S and Caryl–S-substituted flavones were generated under relatively environmentally friendly and simple conditions. This method might be potentially applicable
构造CS键的方法在有机合成中非常重要。在这里,通过使用芳族或烷基卤化物,S粉和Na 2 S 2 O 3作为反应物,开发了一种新的磺酰化方法以生成黄酮硫醚衍生物。在相对环境友好和简单的条件下,可以产生高选择性的区域选择性C烷基-S和C芳基-S取代的黄酮。该方法可能潜在地适用于大规模生产,并且丰富了当前的亚磺酰化方法。
T3P® mediated domino C(sp<sup>2</sup>)–H sulfenylation/annulation of enaminones and methylsulfinyls for the synthesis of chromone thioether derivatives
作者:C. Balakrishna、Ramakrishna Gudipati、Venu Kandula、Satyanarayana Yennam、P. Uma Devi、Manoranjan Behera
DOI:10.1039/c8nj05554h
日期:——
A new regioselective method for the synthesis of 3-(methylthio)-4H-chromen-4-one and 3-(phenylthio)-4H-chromen-4-one derivatives has been developed. The reaction between o-hydroxy-phenyl-functionalized enaminones and methylsulfinyl derivatives using T3P® gave good yields of chromone thioether derivatives. The reaction proceeds via domino chromone ring construction and C(sp2)–H bond sulfenylation under
Aus 3‐Mercaptochromon (1) wurden neue Chromon‐3‐schwefel‐Verbindungen durch Alkylierungs‐, Acylierungs‐, Additions‐, Oxidations‐ und Substitutionsreaktionen erhalten. Ihre Strukturen wurden durch spektroskopische Daten bewiesen.
Utilizing an enaminoketone (1) as starting material, 3-substituted chromones were synthesized by the reactions of acid anhydrides derivatives under mild conditions.