heterocycles has been realized via C(sp3)‐centered radical C(sp2)−C(sp3) bond formation under oxidant‐free conditions at room temperature. This reaction readily incorporates various functional alkyl groups into heterocyclic compounds without observation of any alkyl radicalrearrangement and represents a mild and general tool for the preparation of valuable alkyl group‐functionalized heterocyclic compounds.
Transition Metal-Free Cross-Dehydrogenative Coupling Reaction of Coumarins with Acetonitrile or Acetone
作者:Rongxing Zhang、Shengzhou Jin、Qian Liu、Sen Lin、Zhaohua Yan
DOI:10.1021/acs.joc.8b01508
日期:2018.11.2
A transition metal-free cross-dehydrogenativecoupling of coumarins with acetonitrile or acetone has been established. A series of coumarins were subjected to reaction with acetonitrile or acetone in the presence of tert-butyl benzoperoxoate and potassium fluoride for direct synthesis of 3-cyanomethyl (or acetomethyl) coumarins. The method exhibits good functional group tolerance, and desired products
Osthole is a natural coumarin derivative and has a broad scope of biological activities. Two series of novel fused osthole analogues were designed, and synthesized through a highly efficient microwave‐promoted synthetic protocol via the reaction of 4‐hydroxycoumarins and β‐ketoesters. The reaction conditions including solvent, catalyst, microwave power and irradiation time were also optimized. The
Osthole是天然的香豆素衍生物,具有广泛的生物活性。设计了两个系列的新型融合甾醇类似物,并通过高效的微波促进合成方案,通过4-羟基香豆素和β-酮酸酯的反应进行合成。还优化了反应条件,包括溶剂,催化剂,微波功率和辐照时间。通过两个不同的分子内环化过程获得吡喃并[3,2 - c ]色烯-2,5-二酮和呋喃[3,2- c ]香豆素,并讨论了所提出的机理。
Chemistry of Phosphorus Ylides. Part 33. Synthesis and Antitumor Activities of Some New Chromenone Derivatives
作者:Soher S. Maigali、Mansoura A. Abd-El-Maksoud、Fouad M. Soliman
DOI:10.1002/ardp.201000341
日期:2011.7
phosphallene ylides with different chromenone derivatives was investigated. Heterocycles and carbocycles of various ring sizes and heteroatom patterns such as pyrano‐, oxaphosphino‐, cyclopenta‐, phosphoranylidene cyclobutane‐, and phospholo‐chromenones were obtained. The antitumor (breast and liver) properties of some new compounds were performed in vitro. Some of these compounds were more potent than