Preparation and reactions of 2,3,4,6-tetrafluoropyridine and its derivatives
作者:Paul L Coe、Anthony J Rees
DOI:10.1016/s0022-1139(99)00189-x
日期:2000.1
to give 3-chlorotetrafluoropyridine and its subsequent hydrodechlorination using hydrogen over palladium on alumina at 250–270°C. The formation and reactions of the 3-lithio derivative have been studied with the aim of obtaining 3,4-disubstituted trifluoropyridines. Routes to such materials have been developed and their conversion to deazapurine derivatives as potential substrates for the generation
Polyfluoroheterocyclic compounds. Part XVI. Tetrafluoropyridine-3- and -4-carbaldehydes and some derivatives of the latter
作者:R. D. Chambers、C. A. Heaton、W. K. R. Musgrave、L. Chadwick
DOI:10.1039/j39690001700
日期:——
Tetrafluoro-3- and -4-lithiopyridines behave normally in reacting with N-methylformanilide to give tetrafluoropyridine-3- and -4-carbaldehydes. The 4-carbaldehyde can be oxidised and reduced to the corresponding acid and carbinol respectively. It also reacts with pentafluorophenyl-lithium and tetrafluoro-4-lithiopyridine to give the corresponding secondary alcohols, which can be oxidised to pentafluorophenyl
Straightforward Synthesis of Halopyridine Aldehydes via Diaminomethylation
作者:Georgyi Koidan、Serhii Zahorulko、Anastasiia Hurieva、Tetiana Shvydenko、Eduard B. Rusanov、Alexander B. Rozhenko、Uwe Manthe、Aleksandr Kostyuk
DOI:10.1002/chem.202301675
日期:2023.10.2
Pyridines featuring two or more halogen atoms react with silylformamidine via insertion into the most acidic C−H bond either at the γ or β-positions affording the corresponding aminals. Their hydrolysis gave aldehydes. The reaction proceeds via H-abstraction from pyridines by the strong base-carbenic form of silylformamidine followed by formation of C−C bond between the formamidinium cation and the