Abstract A new method of Sonogashira coupling reactions between diorganyl tellurides and terminal alkynes is reported. The coupling reactions are performed using Pd(dppf)Cl2 as a catalyst, CuI as a co-catalyst in the presence of K2CO3 in DMSO. The reactions are carried out at room temperature and completed within 2 h when phenyl acetylene is used as a terminal alkyne. For aliphatic terminal alkynes
A CONVENIENT SYNTHESIS OF SYMMETRICAL DIARYL TELLURIDES USING TELLURIUM/RONGALITE AS TELLURATION SYSTEM
作者:Hitomi Suzuki、Masahiko Inouye
DOI:10.1246/cl.1985.389
日期:1985.3.5
Sodium telluride, prepared by reducing tellurium with rongalite in dilute aqueous sodium hydroxide, readily reacts with nonactivated aryl iodides to afford symmetrical diaryl tellurides in good yields.
Catalyst free one-pot synthesis of symmetrical diaryl tellurides with Te0/KOH
作者:Shaozhong Zhang、Kranthi Karra、Adam Koe、Jin Jin
DOI:10.1016/j.tetlet.2013.02.084
日期:2013.5
A highly efficient new protocol for C-Te bond formation leading to symmetrical diaryl tellurides has been developed. The synthesis employed aryl iodides and elemental tellurium as starting materials in the presence of KOH. It is a one-pot reaction without using any catalyst. Utilizing this new protocol, a variety of aryl and heteroaryl iodides are reacted with elemental tellurium to afford the corresponding diaryl tellurides in good to excellent yields. Published by Elsevier Ltd.