Dirhodium(<scp>ii</scp>)/P(<i>t</i>-Bu)<sub>3</sub> catalyzed tandem reaction of α,β-unsaturated aldehydes with arylboronic acids
作者:Ziling Ma、Yuanhua Wang
DOI:10.1039/c8ob01997e
日期:——
catalyst for the synthesis of aryl alkyl ketones by the tandem reaction of α,β-unsaturated aromatic or aliphatic aldehydes with arylboronic acids. This tandem procedure included arylation followed by the isomerization reaction. This method exhibits good functional group tolerance and has a broad substrate scope. With the conjugated aldehydes, the one-step synthesis of γ,δ-unsaturated ketones was realized
Ir-Catalyzed α-Alkylation of Ketones with Alcohols: One-Step Access to Donepezil
作者:Sen Wang、Rui Miao、Lu Ouyang、Yanping Xia、Yifei Wei、Renshi Luo
DOI:10.1055/a-1894-8826
日期:2022.12
We demonstrate an iridium-catalyzed alkylation of ketones with alcohols, which enables one-step access to donepezil, cyclic ketones, and linear ketones in high yields. A scale-up experiment shows the excellent practicability of this protocol. Comparative experiments show that a small amount of water is beneficial to the improvement of product yield.
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.
Formal Enone α-Arylation via I(III)-Mediated Aryl Migration/Elimination
作者:Bruna S. Martins、Daniel Kaiser、Adriano Bauer、Irmgard Tiefenbrunner、Nuno Maulide
DOI:10.1021/acs.orglett.1c00251
日期:2021.3.19
A formal enone α-arylation is described. This metal-free transformation relies on the I(III)-mediated skeletal reorganization of silyl enol ethers and features mild conditions, good yields, and high stereoselectivities for β-substituted enones.