FeCl<sub>3</sub>-Diorganyl Dichalcogenides Promoted Cyclization of 2-Alkynylanisoles to 3-Chalcogen Benzo[<i>b</i>]furans
作者:Rafaela M. Gay、Flávia Manarin、Caroline C. Schneider、Daniela A. Barancelli、Michael D. Costa、Gilson Zeni
DOI:10.1021/jo101126q
日期:2010.8.20
2-alkynylanisoles, via FeCl3/diorganyl dichalcogenides intramolecular cyclization, has been developed. Aryl and alkylgroups directly bonded to the chalcogen atom were used as cycling agents. The results revealed that the reaction significantly depends on the electronic effects of substituents in the aromatic ring bonded to the selenium atom of the diselenide species. We observed that the pathway of reaction was
通过FeCl 3从容易获得的2-炔基苯甲醚中合成3-硫属元素苯并[ b ]呋喃/ diorganyl dichalcogenides分子内环化已得到开发。直接结合到硫属元素原子上的芳基和烷基用作循环剂。结果表明,该反应显着取决于与二硒化物物种的硒原子键合的芳环中取代基的电子效应。我们观察到反应途径对苯甲醚芳环中取代基的性质不敏感,因为给电子基团和吸电子基团均以相似的产率传递产物。此外,将得到的杂环被容易地通过使用与硫属/锂交换反应转化成更复杂的产品Ñ-BuLi,然后用醛截留锂中间体,以良好的产率提供所需的仲醇。
Copper-Iodide- and Diorganyl-Diselenide-Promoted Cyclization of 2-Alkynylphenols: Alternative Approach to 3-Organoselanylbenzo[<i>b</i>
]furans
作者:Jean C. Kazmierczak、Ana M. S. Recchi、Fabiane Gritzenco、Everton B. Balbom、Thiago Barcellos、Adriane Sperança、Benhur Godoi
DOI:10.1002/ejoc.201701205
日期:2017.11.24
This manuscript describes an alternative method for the synthesis of 3-organoselanyl-benzo[b]furans through intramolecular cyclization of 2-alkynyl-phenols promoted by copper iodide and diorganyl diselenides. The cyclization reactions were carried out at room temperature in the absence of base and under ambient atmosphere (open flask). This synthetic methodology proved to be efficient to both diorganyl