695-37-4Relevant articles and documents
Visible-Light-Induced ortho-Selective Migration on Pyridyl Ring: Trifluoromethylative Pyridylation of Unactivated Alkenes
Jeon, Jinwon,He, Yu-Tao,Shin, Sanghoon,Hong, Sungwoo
supporting information, p. 281 - 285 (2019/11/26)
The photocatalyzed ortho-selective migration on a pyridyl ring has been achieved for the site-selective trifluoromethylative pyridylation of unactivated alkenes. The overall process is initiated by the selective addition of a CF3 radical to the alkene to provide a nucleophilic alkyl radical intermediate, which enables an intramolecular endo addition exclusively to the ortho-position of the pyridinium salt. Both secondary and tertiary alkyl radicals are well-suited for addition to the C2-position of pyridinium salts to ultimately provide synthetically valuable C2-fluoroalkyl functionalized pyridines. Moreover, the method was successfully applied to the reaction with P-centered radicals. The utility of this transformation was further demonstrated by the late-stage functionalization of complex bioactive molecules.
Preparation method of halogenated pyridine type nitrogen oxide
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Paragraph 0030-0034, (2019/02/26)
The invention discloses a preparation method of a halogenated pyridine type nitrogen oxide. The method comprises the following steps: (1) dissolving a raw material halogenated pyridine into a solvent,adding a certain amount of an oxidizing agent, performing a reaction in a range of a reaction temperature of 0 to 40 DEG C, and after the reaction ends, obtaining a reaction product; (2) performing asubsequent postprocessing step on the reaction product obtained in the step (1) so as to obtain the target product halogenated pyridine type nitrogen oxide. The preparation method disclosed by the invention has the advantages of low reaction temperature, high yield, high purity, low cost and the like.
SYNTHESIS OF META-SUBSTITUTED [18F]-3-FLUORO-4-AMINOPYRIDINES BY DIRECT RADIOFLUORINATION OF PYRIDINE N-OXIDES
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Sheet 2/26, (2018/01/19)
Disclosed herein are methods for the fluorination aromatic N-heterocyclic N-oxides that comprise at least one leaving group. The N-oxides may be reduced to the fluorinated aromatic N-heterocyclic amine analogs. This novel fluorination approach may be successfully applied for synthesizing aromatic N-heterocyclic compounds labeled with 18F.