Cyclization of Homopropargyl Chalcogenides by Copper(II) Salts: Selective Synthesis of 2,3-Dihydroselenophenes, 3-Arylselenophenes, and 3-Haloselenophenes/thiophenes
作者:Ricardo F. Schumacher、Alisson R. Rosário、Marlon R. Leite、Gilson Zeni
DOI:10.1002/chem.201302129
日期:2013.9.23
Copper(II) halide mediated cyclization of homopropargyl chalcogenides gave three types of chalcogenophene derivatives. Selective product formation was achieved by controlling solvent, temperature, and atmosphere. By using CuBr2 and 1,2‐dichloroethane at room temperature under ambient atmosphere, 4‐bromo dihydroselenophene derivatives were obtained, whereas CuBr2 and 1,2‐dichloroethane at reflux gave
铜(II)卤化物介导的高炔丙基硫属元素化物的环化反应产生了三种类型的硫属元素衍生物。通过控制溶剂,温度和气氛来实现选择性产物的形成。通过在室温和环境气氛下于室温下使用CuBr 2和1,2-二氯乙烷,可制得4-溴二氢硒苯衍生物,而CuBr 2和1,2-二氯乙烷在回流条件下产生选择性2-取代的硒烯。当1,2-二氯乙烷被二甲基乙酰胺代替时,仅获得3-卤代硒代苯。还通过在Sonogashira条件下3-卤代亚硒基与末端炔烃的反应研究了硫属芴的多功能性,从而提供了交叉偶联的产物。此外,3-卤代亚硒基与硼酸的反应以良好的收率得到了相应的铃木型产物。