Au(I)-Catalyzed Intramolecular Hydroamination of the Fluorinated <i>N′</i>-Aryl-<i>N</i>-Propargyl Amidines: Mild Conditions for the Synthesis of 2-Fluoroalkyl Imidazole Derivatives
The gold(I)-catalyzedsynthesis of 2-fluoroalkyl imidazolederivatives was developed. Catalyzed by gold(I), propargyl amidines underwent a 5-exo-dig cyclization to afford 2-fluoroalkyl-5-methyl imidazoles. Also, 2-fluoroalkyl imidazole-5-carbaldehydes were obtained in the presence of NIS. A mechanism investigation manifested the probable process and the carbonyl oxygen derived from O2.
Gold(I)-Catalyzed Aminohalogenation of Fluorinated<i>N</i>′-Aryl-<i>N</i>-Propargyl Amidines for the Synthesis of Imidazole Derivatives under Mild Conditions
A procedure for the synthesis of fluorinated imidazolederivatives from propargyl amidines has been developed. Undergold(I) catalysis, propargyl amidines were converted into 5‐fluoromethyl imidazoles in the presence of Selectfluor through a cascade cyclization/fluorination process. In contrast, imidazole‐5‐carbaldehydes were obtained in high yields when N‐iodosuccinimide (NIS) was used as the halogenating
The first example of Bi(iii)-catalyzed aminooxygenation was developed to synthesize 2-fluoroalkyl imidazole-5-carbaldehydes that would decarbonylate efficiently in the presence of KOt-Bu.