Chalcogenoalkynes: Precursors for the Regioselective Preparation of 2-Chalcogeno-1-halonaphthalenes through [4+2] Cycloaddition
作者:Anderson C. Mantovani、Davi F. Back、Gilson Zeni
DOI:10.1002/ejoc.201200482
日期:2012.8
Chalcogenoalkynes and o-alkynylbenzaldehydes reacted in the presence of copper(II) salt to give the [4+2] cycloadducts 2-chalcogeno-1-halonaphthalenes in good yields (46–89 %) and high regioselectivities. The methodology was carried out by using CuCl2 or CuCl2/LiBr in 1,2-dichloroethane (DCE) at 80 °C. The potential and generality of this system was evaluated by using a variety of chalcogenoalkynes
硫族炔烃和邻炔基苯甲醛在铜 (II) 盐存在下反应,以良好的产率 (46–89%) 和高区域选择性得到 [4+2] 环加合物 2-硫族-1-卤代萘。该方法在 80 °C 下使用 CuCl2 或 CuCl2/LiBr 的 1,2-二氯乙烷 (DCE) 溶液进行。该系统的潜力和通用性是通过使用各种硫属炔烃来评估的,包括具有硫和硒原子的芳香族、取代芳香族和脂肪族底物。在这个序列中,由于硫属元素原子稳定电荷的能力,这些取代基发挥了引导选择性的区域控制。