Fe powder catalyzed highly efficient synthesis of alkenyl halides via direct coupling of alcohols and alkynes with aqueous HX as exogenous halide sources
作者:Yong-Rong Yang、Qiang Zhang、Feng-Tian Du、Jian-Xin Ji
DOI:10.1016/j.tet.2015.04.065
日期:2015.6
A simple and efficient catalytic method for the synthesis of alkenylhalides via direct coupling of alcohols and alkynes using aqueous HX (X=Cl, Br) as halide sources has been developed under mild conditions in the presence of Fe powder (1 mol %). In comparison with the high loading of FeX3 in previously reported protocols, the present approach provides a remarkable attractive methodology to a diverse
This work demonstrated an efficient and mild method for preparing various substituted alkenylhalides via direct C–C bond formation of benzyl alcohols and aryl alkynes in CH2Cl2 at 50 °C by using 50 mol % of FeCl3·6H2O or FeBr3. Compared with the systems using excessive boron trihalides and stoichiometric n-BuLi to prepare substituted alkenylhalides, the present procedure would provide an excellent