Synthesis of Fused 4-Iodoselenophene[2,3-<i>b</i>]thiophenes by Electrophilic Cyclization of 3-Alkynylthiophenes
作者:André L. Stein、Juliana da Rocha、Paulo Henrique Menezes、Gilson Zeni
DOI:10.1002/ejoc.200901118
日期:2010.2
We present here our results on the electrophilic cyclization reaction of 3-alkynylthiophenes with different electrophiles such as I 2 , ICl, and PhSeBr. The cyclization reaction proceeded cleanly under mild reaction conditions, giving fused 4-iodoselenophene[2,3-b]thiophenes in excellent yields. In addition, the obtained chalcogenophenes were readily transformed into more complex products through palladium-
我们在此展示了 3-炔基噻吩与不同亲电试剂(如 I 2 、ICl 和 PhSeBr)的亲电环化反应的结果。环化反应在温和的反应条件下顺利进行,以优异的产率得到稠合的 4-碘硒吩[2,3-b]噻吩。此外,通过钯或铜催化与硫醇、硼酸和有机锌试剂的交叉偶联反应,获得的硫属元素很容易转化为更复杂的产物。