A flexible and efficient carbonylative synthesis of thiochromenones from the commercially available materials by utilizing tert-butyl isocyanide as carbonyl source has been developed. This methodology efficiently constructs thiochromenones in moderate to excellent yields with the advantages of wide range of substrates and being applicable to library synthesis.
biological activities due to their structural relationship with chromones (benzopyrans), which are widely known as privileged scaffolds in medicinal chemistry. In this work, we report the synthesis of 35 thiochromone derivatives and the in vitro antileishmanial and cytotoxic activities. Compounds were tested against intracellular amastigotes of Leishmania panamensis and cytotoxic activity against human monocytes
Lewis Acid-Triggered Selective Zincation of Chromones, Quinolones, and Thiochromones: Application to the Preparation of Natural Flavones and Isoflavones
作者:Lydia Klier、Tomke Bresser、Tobias A. Nigst、Konstantin Karaghiosoff、Paul Knochel
DOI:10.1021/ja306178q
日期:2012.8.22
A Lewis acid-triggered zincation allows the regioselective metalation of various chromones and quinolones. In the absence of MgCl(2), a C(3) zincation is observed, whereas in the presence of MgCl(2) or a related Lewis acid, C(2) zincation occurs. Applications to a natural flavone, isoflavone, and quinolone are shown.
Transition-Metal-Free One-Pot Tandem Synthesis of 4-Quinolone and 4H-Thiochromen-4-one Derivatives Through Sequential Nucleophilic Addition–Elimination–SNAr Reaction
transformed to 4-quinolone or 4H-thiochromen-4-one products through intramolecular SNAr reaction, respectively. 4-Quinolone and 4H-thiochromen-4-one derivatives are readily synthesized in a tandemone-pot manner in good to excellent yields. Starting from (Z)-β-chlorovinyl ketones, an intermolecular nucleophilic addition of amines or sodium hydrogen sulfide to (Z)-β-chlorovinyl ketones was followed by elimination
摘要 4-喹诺酮和4 H-硫代色素-4-酮衍生物很容易以串联-一锅方式以良好至极好的产率合成。从(Z)-β-氯乙烯酮开始,分子间亲核加成胺或硫化氢钠到(Z)-β-氯乙烯酮中,然后消除氯阴离子,得到Z-烯胺或硫代烯醇中间体,可以将其转化通过分子内的S N Ar反应分别生成4-喹诺酮或4 H-硫代色素-4-酮。 4-喹诺酮和4 H-硫代色素-4-酮衍生物很容易以串联-一锅方式以良好至极好的产率合成。从(Z)-β-氯乙烯酮开始,分子间亲核加成胺或硫化氢钠到(Z)-β-氯乙烯酮中,然后消除氯阴离子,得到Z-烯胺或硫代烯醇中间体,可以将其转化通过分子内的S N Ar反应分别生成4-喹诺酮或4 H-硫代色素-4-酮。
An efficient approach to the synthesis of 4H-1-benzothiopyran-4-ones via intramolecular Wittig reaction
作者:Pradeep Kumar、Ashok T. Rao、Bipin Pandey
DOI:10.1039/c39920001580
日期:——
The reaction of S-acyl(aroyl)thiosalicylic acids 2 with N-phenyl(triphenylphosphoranylidene)ethenimine 3 in stepwise fashion leads to the acylphosphoranes 5 which subsequently undergo intramolecular Wittig cyclization on the thiolester carbonyl to afford the 4H-1-benzothiopyran-4-ones 7 in excellent yields.