ketones and an unexpected cross‐coupling of phenolic ketones was observed using unactivated bromides and magnesium in tetrahydrofuran/toluene at 96 °C promoted by multicatalysts of cupric bromide (15 mol%), bismuth chloride (5 mol%) and silver bromide (10 mol%). The substituent and electroniceffects on the reaction have been discussed. High yields of arylation and cross‐coupling have been attained under
A Convenient Synthesis of 2-Naphthylcyclopentanones and 2-Naphthylcyclohexanones from 1-Naphthylcycloalkenes
作者:Maciej Góra、Michał K. Łuczyński、Janusz J. Sepioł
DOI:10.1055/s-2005-865298
日期:——
The oxidation of naphthylcycloalkenes with hydrogen peroxide or MCPBA followed by acid catalyzed rearrangement of diol (epoxide), afforded a series of naphthylcycloalkanones in a very simple manner. The conditions allow preparation of naphthylcycloalkanones on a multigram scale.
SmI2-mediated reductive cleavage of α-hetero substituents of α-alkyl or α-aryl ketones and lactone gave the corresponding “thermodynamic samarium enolates”. Enantioselective protonation of the samarium enolates with C2-symmetric chiral diols afforded the corresponding ketones and lactone in moderate to high enantioselectivities.
Organophotocatalytic ring opening/remote trifluoromethylselenolation of cycloalkanols
作者:Qingyao Zhang、Wanqiang Yuan、Yingbo Shi、Fei Pan
DOI:10.1016/j.tetlet.2022.153787
日期:2022.5
An organophotocatalytic ringopening/remote trifluoromethylselenolation of cycloalkanols is reported. This reaction proceeds the radical ring-opening in a photocatalytic system without metal catalysis under mild conditions, followed by the formation of the remote C(sp3)-SeCF3 bond in the presence of PhSO2SeCF3. The reaction brings out highly reactive to prepare trifluoromethylselenolated carbonyl compounds