Borrowing hydrogen: iridium-catalysed reactions for the formation of C–C bonds from alcohols
作者:Phillip. J. Black、Gerta Cami-Kobeci、Michael G. Edwards、Paul A. Slatford、Michael K. Whittlesey、Jonathan M. J. Williams
DOI:10.1039/b511053j
日期:——
Alcohols have been employed as substrates for C-C bond-forming reactions which involve initial activation by the temporary removal of hydrogen to form an aldehyde. The intermediate aldehyde is converted into an alkene via a Horner-Wadsworth-Emmons reaction, nitroaldol and aldol reactions. The 'borrowed hydrogen' is then returned to the alkene to form a C-C bond.
The highly chemoselective transfer hydrogenation of the carbon–carbon double bond of conjugated nitroalkenes by a rhodium complex
作者:Jing Xiang、Er-Xiao Sun、Chun-Xia Lian、Wei-Cheng Yuan、Jin Zhu、Qiwei Wang、Jingen Deng
DOI:10.1016/j.tet.2012.04.028
日期:2012.6
Chemoselective transfer hydrogenation of conjugatednitroalkenes catalyzed by [RhCl2Cp∗]2–diamine complex (Cp∗=η5-C5Me5) using HCOOH/Et3N (5:2) (TEAF) as a hydrogen source was realized. A variety of nitrostyrenes, β-methyl nitrostyrenes, and 3-methyl-4-nitro-5-alkenyl-isoxazoles were reduced smoothly in good to excellent yields in short reaction time. Other functional groups are inert under the reaction