PCN Pincer Palladium(II) Complex Catalyzed Enantioselective Hydrophosphination of Enones: Synthesis of Pyridine-Functionalized Chiral Phosphine Oxides as NC<sub>sp<sup>3</sup></sub>O Pincer Preligands
作者:Xin-Qi Hao、Juan-Juan Huang、Tao Wang、Jing Lv、Jun-Fang Gong、Mao-Ping Song
DOI:10.1021/jo5015307
日期:2014.10.17
A series of chiral PCN pincer Pd(II) complexes VI–XIII with aryl-based aminophosphine–imidazoline or phosphinite–imidazoline ligands were synthesized and characterized. They were examined as enantioselective catalysts for the hydrophosphination of enones. Among them, complex IX, which features a Ph2PO donor as well as an imidazoline donor with (4S)-phenyl and N-Tol-p groups, was found to be the optimal
Chemoselective transfer hydrogenation of α,β-unsaturated carbonyls catalyzed by a reusable supported Pd nanoparticles on biomass-derived carbon
作者:Tao Song、Yanan Duan、Yong Yang
DOI:10.1016/j.catcom.2018.11.017
日期:2019.2
We herein report highly chemoselective transfer hydrogenation of α,β-unsaturatedcarbonyl compounds to saturatedcarbonyls with formic acid as a hydrogen donor over a stable and recyclable heterogeneous Pd nanoparticles (NPs) on N,O-dual doped hierarchical porous biomass-derived carbon. The synergistic effect between Pd NPs and incorporated heteroatoms on carbon plays a critical role on promoting the
Chemoselective Hydrogenation of α,β-Unsaturated Carbonyls Catalyzed by Biomass-Derived Cobalt Nanoparticles in Water
作者:Tao Song、Zhiming Ma、Yong Yang
DOI:10.1002/cctc.201801987
日期:2019.2.20
selectivity for hydrogenation of C=C in α,β‐unsaturated carbonyls under mild conditions. A broad set of α,β‐aromatic and aliphatic unsaturated carbonyls were selectively reduced to their corresponding saturatedcarbonyls in up to 99 % yields with good tolerance of various functional groups. Meanwhile, a new straightforward one‐pot cascade synthesis of saturatedcarbonyls was realized with high activity and
Chemoselective Hydrosilylation of the α,β-Site Double Bond in α,β- and α,β,γ,δ-Unsaturated Ketones Catalyzed by Macrosteric Borane Promoted by Hexafluoro-2-propanol
作者:Xiao-Yu Zhan、Hua Zhang、Yu Dong、Jian Yang、Shuai He、Zhi-Chuan Shi、Lei Tang、Ji-Yu Wang
DOI:10.1021/acs.joc.0c00568
日期:2020.5.15
The B(C6F5)3-catalyzed chemoselective hydrosilylation of α,β- and α,β,γ,δ-unsaturated ketones into the corresponding non-symmetric ketones in mild reaction conditions is developed. Nearly 55 substrates including those bearing reducible functional groups such as alkynyl, alkenyl, cyano, and aromatic heterocycles are chemoselectively hydrosilylated in good to excellent yields. Isotope-labeling studies
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.