An efficient and heterogeneous recyclable palladium catalyst for chemoselective conjugate reduction of α,β-unsaturated carbonyls in aqueous medium
作者:Dattatraya B. Bagal、Ziyauddin S. Qureshi、Kishor P. Dhake、Shoeb R. Khan、Bhalchandra M. Bhanage
DOI:10.1039/c1gc15050b
日期:——
An highly efficient PS-Pd-NHC catalytic system has been developed for chemoselective conjugate reduction of α,β-unsaturated carbonyl compounds providing good to excellent conversion with remarkable chemoselectivity (up to 100%). The developed protocol is more advantageous due to use of HCOONa as hydrogen source, environmentally benign water as solvent and effective catalyst recyclability.
One-pot β-alkylation of secondary alcohols with primary alcohols catalyzed by ruthenacycles
作者:Xu Chang、Low Wei Chuan、Li Yongxin、Sumod A. Pullarkat
DOI:10.1016/j.tetlet.2012.01.025
日期:2012.3
best combination of reactivity and product selectivity among the four. An expanded scope of substrates was also studied with the inclusion of unsaturated primary alcohols. The reactivity trend observed gave insights into the role of hydrogen bonding in the catalytic mechanism involving transfer hydrogenation between the substrates and the transitionmetal catalyst.
Oxidation and β-Alkylation of Alcohols Catalysed by Iridium(I) Complexes with Functionalised N-Heterocyclic Carbene Ligands
作者:M. Victoria Jiménez、Javier Fernández-Tornos、F. Javier Modrego、Jesús J. Pérez-Torrente、Luis A. Oro
DOI:10.1002/chem.201502910
日期:2015.12.1
for the use of alcohols as alkylating agents for CC bond forming processes offering significant environmental benefits over traditional approaches. Iridium(I)‐cyclooctadiene complexes having a NHC ligand with a O‐ or N‐functionalised wingtip efficiently catalysed the oxidation and β‐alkylation of secondary alcohols with primary alcohols in the presence of a base. The cationic complex [Ir(NCCH3)(cod)(MeIm(2‐
The tris(acetylacetonato)rhodium(III) catalyst is shown to be a versatile catalyst in the presence of DABCO (1,4‐diazabicyclo[2.2.2]octane) as ligand for the α‐alkylation of ketones followed by transfer hydrogenation, for the one‐pot β‐alkylation of secondary alcohols with primary alcohols and for the alkylation of aromatic amines in the presence of an inorganic base in toluene.
Catalyst-Free Dehydrative α-Alkylation of Ketones with Alcohols: Green and Selective Autocatalyzed Synthesis of Alcohols and Ketones
作者:Qing Xu、Jianhui Chen、Haiwen Tian、Xueqin Yuan、Shuangyan Li、Chongkuan Zhou、Jianping Liu
DOI:10.1002/anie.201308642
日期:2014.1.3
Direct dehydrative α‐alkylation reactions of ketones with alcohols are now realized under simple, practical, and green conditions without using external catalysts. These catalyst‐free autocatalyzed alkylation methods can efficiently afford useful alkylated ketone or alcohol products in a one‐pot manner and on a large scale by CC bond formation of the in situ generated intermediates with subsequent