An Efficient Synthesis of (Fluoromethyl)pyridylamines for Labeling with Fluorine-18
摘要:
We have described a two-step method for the preparation of (fluoromethyl)pyridyl-substituted amines. The sequence involves fluoride ion displacement of methanesulfonates (mesylates) of 6-chloro-alpha-hydroxy-2- and -3-picolines, followed by arylation of the amine by chloropicoline. We have called this sequence fluorination-N-arylation. 1-Phenylpiperazine has been used as a model amine. Two key precursors for this sequence are the mesylates of 6-chloro-alpha-hydroxy-2- and -3-picolines. The former was synthesized in four steps from 6-chloro-2-picoline in 78% yield and the latter in three Steps from 6-chloronicotinic acid in 53% yield. This fluorination-N-arylation sequence is sufficiently rapid and efficient for the preparation of a variety of aryl-substituted amine compounds labeled with the short half-life (t(1/2) = 110 min) positron-emitting radionuclide fluorine-18.
An Efficient Synthesis of (Fluoromethyl)pyridylamines for Labeling with Fluorine-18
作者:Kyo Chul Lee、Dae Yoon Chi
DOI:10.1021/jo990994f
日期:1999.11.1
We have described a two-step method for the preparation of (fluoromethyl)pyridyl-substituted amines. The sequence involves fluoride ion displacement of methanesulfonates (mesylates) of 6-chloro-alpha-hydroxy-2- and -3-picolines, followed by arylation of the amine by chloropicoline. We have called this sequence fluorination-N-arylation. 1-Phenylpiperazine has been used as a model amine. Two key precursors for this sequence are the mesylates of 6-chloro-alpha-hydroxy-2- and -3-picolines. The former was synthesized in four steps from 6-chloro-2-picoline in 78% yield and the latter in three Steps from 6-chloronicotinic acid in 53% yield. This fluorination-N-arylation sequence is sufficiently rapid and efficient for the preparation of a variety of aryl-substituted amine compounds labeled with the short half-life (t(1/2) = 110 min) positron-emitting radionuclide fluorine-18.
Lee; Choi; Choe, Journal of labelled compounds and radiopharmaceuticals, 1999, vol. 42, # SUPPL. 1, p. S99-S101