Iodine-Mediated Synthesis of 2-(Methylthio)-4<i>H</i>-chromen-4-ones and Study of Their Halogenation Reactions
作者:Amr Elagamy、Ranjay Shaw、Chandan Shah、Ramendra Pratap
DOI:10.1021/acs.joc.1c00788
日期:2021.7.16
2-(methylthio)-4H-chromen-4-ones by intramolecular cyclization of easily accessible 1-(2-benzyloxy-aryl)-3,3-bis-methylsulfanyl-propenones. The synthesized chromen-4-ones turn out to be a key precursor for various kinds of chemical reactions. Mechanistically, we observed that iodine-mediated intramolecular cyclization of ketene dithioacetal proceeded through a radical pathway. 3-Halo-2-(methylthio)-4H-chromen-4-ones
开发了一种有效的碘介导方法,用于通过容易获得的 1-(2-苄氧基-芳基)-3,3-双-甲基硫烷基的分子内环化合成功能化的 2-(甲硫基)-4 H-色烯-4-酮-丙烯酮。合成的 chromen-4-ones 是各种化学反应的关键前体。从机制上讲,我们观察到碘介导的二硫代乙缩醛分子内环化是通过自由基途径进行的。3-Halo-2-(methylthio)-4 H -chromen-4-ones 是通过各种两锅或一锅卤化方法实现的。