The rhenium hetaphydride complex was found to be a versatile, homogeneous catalyst for dehydrogenative functionalization of alcohol. The dehydrogenative C-C coupling of alcohols and carbonyl compounds was carried out in the absence Of base and hydrogen acceptors to afford a series of alpha,beta-unsaturated carbonyl compounds. A possible dual activation pathway was proposed by mechanistic investigations.
Palladium-Catalyzed Intramolecular 5-<i>exo</i>-<i>dig</i> Hydroarylations of <i>N</i>-Arylpropiolamides: Thermodynamics-Controlled Stereoselective Synthesis of 3-Methyleneoxindoles
作者:Tao-Shan Jiang、Ri-Yuan Tang、Xing-Guo Zhang、Xin-Hua Li、Jin-Heng Li
DOI:10.1021/jo901963g
日期:2009.11.20
has been developed for the stereoselectivesynthesis of 3-(monosubstituted methylene)oxindoles. In the presence of Pd(OAc)2 and dppf, a variety of N-arylpropiolamides successfully underwent the intramolecular hydroarylation reaction to afford the corresponding 3-(monosubstituted-methylene)oxindoles in moderate to excellent yields. It is noteworthy that the stereoselectivity of the reaction can be controlled