Transition-Metal-Free Sulfuration/Annulation of Alkenes: Economical Access to Thiophenes Enabled by the Cleavage of Multiple C–H Bonds
作者:Liang Chen、Hao Min、Weilan Zeng、Xiaoming Zhu、Yun Liang、Guobo Deng、Yuan Yang
DOI:10.1021/acs.orglett.8b03078
日期:2018.12.7
and transition-metal-free strategy for the synthesis of thiophenes from substituted buta-1-enes with potassium sulfide has been presented. The reaction achieves double C–S bond formations via cleavage of multiple C–H bonds and provides an efficient approach to access various functionalized thiophenes. Moreover, the strategy can also be used for the synthesis of thiophenes from 1,4-diaryl-1,3-dienes.
提出了一种新颖的,原子经济的,无过渡金属的策略,用于用硫化钾从取代的丁-1-烯合成噻吩。该反应可通过裂解多个C–H键实现双C–S键形成,并提供了一种有效的方法来接近各种官能化的噻吩。此外,该策略也可用于由1,4-二芳基-1,3-二烯合成噻吩。从机理上讲,DMSO起到氧化剂的作用,并涉及由K 2 S原位产生的S 3 •。