Catalyst-free regioselective hydroxyfluorination and aminofluorination of α,β-unsaturated ketones
作者:Jiadi Zhou、Ye Fang、Fang Wang、Jianjun Li
DOI:10.1039/c9ob00467j
日期:——
The catalyst-free direct regioselective α-fluoro-β-hydroxylation and α-fluoro-β-amidation of α,β-unsaturated ketones has been developed. Various α,β-unsaturated ketones react with Selectfluor in water and acetonitrile to give α-fluorohydrins and α-fluoroamides respectively with moderate to good yields. The mechanistic studies revealed the possibility of a radical based pathway.
作者:Oleg V. Fedorov、Mikhail D. Kosobokov、Vitalij V. Levin、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/acs.joc.5b00904
日期:2015.6.5
involves silylation, difluorocarbene addition using Me3SiCF2Br activated by a bromide ion, and halogenation of intermediate cyclopropanes with N-bromo- or N-iodosuccinimide. The whole process is performed without isolation of intermediates. The resulting α,α-difluoro-β-halo-substituted ketones can be readily converted into fluorine containing pyrazole derivatives and oxetanes.
Pd/Cu‐Catalyzed Defluorinative Carbonylative Coupling of Aryl Iodides and
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‐Difluoroalkenes: Efficient Synthesis of α‐Fluorochalcones
作者:Fu‐Peng Wu、Yang Yuan、Jiawang Liu、Xiao‐Feng Wu
DOI:10.1002/anie.202017365
日期:2021.4.12
An unprecedented and challenging defluorinative carbonylation was achieved. Enabled by a Pd/Cu cooperative catalyst system, the first example of defluorinative carbonylativecoupling has been established. With gem‐difluoroalkenes and aryl iodides as the substrates, this methodology offers flexible and facile access to privileged α‐fluorochalcones under mild reaction conditions in moderate‐to‐excellent
A new strategy for the synthesis of 3,5-disubstituted phenols is established through one-pot Robinson annulation of α,β-unsaturated ketones with α-fluoro-β-ketoesters followed by in situ dehydrofluorination and tautomerization. This method has been extended to the synthesis of polysubstituted phenols and applied in the preparation of biologically active compounds.
Cetones α-fluoro α-ethyleniques: preparation et reaction avec le methylure de dimethylsulfoxonium.
作者:Elias Elkik、Michèle Imbeaux-Oudotte
DOI:10.1016/s0040-4039(00)98702-1
日期:1985.1
Reaction of dimethyl-sulfoxonium methylide with non-halogenated α-ethylenic-ketones is known to lead to cyclopropyl derivatives. With α-fluoro α-ethylenic-ketones this reaction furnishes fluoro-epoxides, by addition of a methylene on carbonyl.