A Convenient Synthesis of 2-Arylthiochromen-4-ones (Thioflavones) by Iodine-Mediated Cyclization of 3-Aryl-1-[2-(1,1-dimethylethylsulfanyl)phenyl]prop-2-en-1-ones
摘要:
A convenient two-step synthesis of 2-arylthiochromen-4-ones (thioflavones) beginning with 1-[2-(1,1-dimethylethylsulfanyl)phenyl]ethanones is described. Thus, 3-aryl-1-[2-(1,1-dimethylethylsulfanyl)phenyl]prop-2-en-1-ones were prepared by the condensation of 1-[2-(1,1-dimethylethylsulfanyl)phenyl]ethanones with aromatic aldehyde in the presence of sodium hydroxide, and were treated with iodine in refluxing N-methylpyrrolidin-2-one (NMP) or propanenitrile to afford the desired products in moderate to fair yields.
A Convenient Synthesis of 2-Arylthiochromen-4-ones (Thioflavones) by Iodine-Mediated Cyclization of 3-Aryl-1-[2-(1,1-dimethylethylsulfanyl)phenyl]prop-2-en-1-ones
摘要:
A convenient two-step synthesis of 2-arylthiochromen-4-ones (thioflavones) beginning with 1-[2-(1,1-dimethylethylsulfanyl)phenyl]ethanones is described. Thus, 3-aryl-1-[2-(1,1-dimethylethylsulfanyl)phenyl]prop-2-en-1-ones were prepared by the condensation of 1-[2-(1,1-dimethylethylsulfanyl)phenyl]ethanones with aromatic aldehyde in the presence of sodium hydroxide, and were treated with iodine in refluxing N-methylpyrrolidin-2-one (NMP) or propanenitrile to afford the desired products in moderate to fair yields.
Metal-free visible light-promoted synthesis of isothiazoles: a catalytic approach for N–S bond formation from iminyl radicals under batch and flow conditions
applying photoredoxcatalysis. This simple strategy features mild conditions, broad scope and wide functional group tolerance representing a new enviromentally friendly option to prepare these highly valuable heterocycles. Furthermore, the synthetic value of the method is highlighted by the preparation of a natural product derivative and the implementation of the reaction in a continuousflow setup.
Substituted Benzothietes: Synthesis and a Quantum Chemical Investigation of Their Cycloreversion Properties
作者:Nils L. Ahlburg、Andres R. Velarde、Matthew T. Kieber-Emmons、Peter G. Jones、Daniel B. Werz
DOI:10.1021/acs.orglett.0c01261
日期:2020.6.5
A flexible synthesis for highly substituted benzothietes that does not require flash-vacuumpyrolysis was developed. This allows for the use of a number of functional groups and nonvaporizable molecules. Highly stabilized derivatives were isolated. The molecular orbital properties of various benzothietes were evaluated by density functional methods. The mechanism of the cycloreversion of the four-membered
Efficient Synthesis of Benzothiophenes by an Unusual Palladium-Catalyzed Vinylic CS Coupling
作者:Christopher S. Bryan、Julia A. Braunger、Mark Lautens
DOI:10.1002/anie.200902843
日期:2009.9.7
construction of a CS and a CC bond under catalytic conditions forms the basis of an efficient route to diversely functionalized benzothiophenes from gem‐dihalovinyl thiophenols. The CC bond can be formed in this tandem catalytic process with an organoboron reagent as shown in the scheme (R1=H, Me, F, Cl, Br, OCH2O; R2=H, Me; R3=aryl, heteroaryl, alkenyl, alkyl), or by Heck or Sonogashira coupling with an
同时施工一个C S和一个C 催化条件下C键形成从不同地官能化的苯并噻吩的高效路由的基础宝石-dihalovinyl苯硫酚。与c 可以在此串联与有机硼试剂催化工艺来形成C键为显示在方案(R 1 = H中,Me,F,氯,溴, OCH 2 ö ; R 2 = H中,Me; R 3=芳基,杂芳基,烯基,烷基),或通过Heck或Sonogashira与烯烃或炔烃偶联。