A variety of mono- and disubstituted phenols are alkylated with propargyl bromide to give phenyl 2-propynyl ethers, which were further coupled with aryliodides under Sonogashira reaction conditions to give 3-phenoxy-1-aryl-1-propyne derivatives. The latter compounds underwent an initial Claisen rearrangement followed by ring closure to give functionalized benzo[b]furans in moderate to good yields
用炔丙基溴将各种单取代和二取代的苯酚烷基化,得到苯基2-丙炔基醚,然后在Sonogashira反应条件下将其与芳基碘化物偶合,得到3-苯氧基-1-芳基-1-丙炔衍生物。后面的化合物先进行克莱森重排,然后闭环,以中等至良好的收率得到官能化的苯并[ b ]呋喃。
Synthesis of Chalcogenylchromenes through Cyclization of Propargylic Aryl Ethers
作者:Paola S. Hellwig、Angelita M. Barcellos、Roberta Cargnelutti、Thiago Barcellos、Gelson Perin
DOI:10.1021/acs.joc.2c01490
日期:2022.11.18
We describe here for the first time the synthesis of 2-(chalcogenyl)-3H-benzo[f]chromenes and the new 3-(phenylselanyl)-2H-chromenes by the radical or electrophilic cyclization of propargylic aryl ethers in the presence of diorganyl diselenides or ditellurides using Oxone as a green oxidant and acetonitrile as solvent in a sealed tube at 100 °C. In this study, thirty-one chalcogenylchromenes with a
我们在这里首次描述了通过炔丙基芳基醚在使用 Oxone 作为绿色氧化剂和乙腈作为溶剂在 100 °C 的密封管中制备二有机基二硒化物或二碲化物。在这项研究中,以中等至优异的产率 (50–98%) 制备了 31 种具有广泛底物范围的硫属基色烯,包括源自天然产物的化合物。