Synthesis of 4-Selanyl- and 4-Tellanyl-1<i>H</i>-isochromen-1-ones Promoted by Diorganyl Dichalcogenides and Oxone
作者:Helen A. Goulart、José S. S. Neto、Angelita M. Barcellos、Krigor B. Silva、Maiara C. de Moraes、Raquel G. Jacob、Eder J. Lenardão、Thiago Barcellos、Gelson Perin
DOI:10.1021/acs.joc.1c00271
日期:2021.10.15
A new method was developed for the synthesis of 4-chalcogenyl-1H-isochromen-1-ones through the 6-endo-dig electrophilic cyclization of 2-alkynylaryl esters and diorganyl dichalcogenides under ultrasound irradiation. The reactions were performed under mild conditions, using Oxone as a green oxidant to promote the cleavage of the chalcogen–chalcogen bond in diorganyl diselenides and ditellurides to generate
开发了一种通过2-炔基芳基酯和二有机基二硫属元素化物在超声辐照下 6- endo - dig亲电环化反应合成 4-chalcogenyl- 1H - isochromen -ones的新方法。该反应在温和的条件下进行,使用 Oxone 作为绿色氧化剂来促进二有机二硒化物和二碲化物中硫属元素 - 硫属元素键的断裂,从而原位生成亲电子物质。30-70 分钟后,总共有 25 种化合物被选择性地获得,产率从良好到极好(74-95%)。该程序扩展到制备 5 H-硒酚[3,2 - c ] isochromen -5-ones。此外,首次将 4-chalcogenyl-1 H-isochromen-1-ones 被用作硫化反应中的底物,在无溶剂条件下使用劳森试剂和微波辐射,仅在 15 分钟内就以高达 99% 的产率获得了硫代衍生物。