IBX−I2Redox Couple for Facile Generation of IOH and I+: Expedient Protocol for Iodohydroxylation of Olefins and Iodination of Aromatics
摘要:
IBX is readily reduced to IBA in the presence of molecular iodine in DMSO to generate hypoiodous acid (IOH). which reacts with a variety of olefins as well as alpha, beta-unsaturated ketones leading to their respective iodohydrins with anti stereochemistry. The same redox chemistry in acetonitrile containing TFA produces iodonium lolls for facile Iodination of a variety of aromatic compounds in respectable isolated yields.
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
Electrochemical 1,4-reduction of α,β-unsaturated ketones with methanol and ammonium chloride as hydrogen sources
作者:Binbin Huang、Yanan Li、Chao Yang、Wujiong Xia
DOI:10.1039/c9cc02368b
日期:——
sustainable, chemoselective 1,4-reduction of α,β-unsaturatedketones by means of an electrochemical method is presented, wherein the extremely inexpensive ammonium chloride (NH4Cl) is applied as the only additive. The reaction proceeds smoothly in the air at ambient temperature. Mechanistic studies reveal that both NH4Cl and solvent methanol work as hydrogen donors.
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
Uncatalyzed conjugate addition of organozinc halides to enones in DME: a combined experimental/computational study on the role of the solvent and the reaction mechanism
calculations, prompted by the experimental aggregation study, revealed an unexpected reactionmechanism, where the coordinating capabilities of DME stabilize a transition state involving two organozinc moieties, lowering the activation energy of the reaction with respect to that seen for THF, enough to explain the fast and quantitative reactions observed experimentally and the different behaviors of