The acid decomposition of 1-aryl-3,3-dialkyltriazenes. Mechanistic changes as a function of aromatic substitution, nucleophile strength, and solvent
作者:Jorge R. Barrio、Nagichettiar Satyamurthy、Hao Ku、Micheal E. Phelps
DOI:10.1039/c39830000443
日期:——
Solvent, nucleophilestrength, and substituents on the phenyl ring modified the yeild of aromatic halogenation using 1-aryl-3,3-dialkyltriazenes (2a–f) and halid ion in anhydrous acidic media.
Rapid and Efficient Synthesis of High-Purity Fluorine-18 Labeled Haloperidol and Spiperone via the Nitro Precursor in Combination with a New HPLC Separation Method
We have completed a convenient synthesis of fluorine-18 labeled butyrophenone neuroleptics from their nitro precursors. Thus, we have developed an efficient single-column HPLC system using a C18-bonded vinyl alcohol copolymer gel (octadecyl polymer, ODP) column and strongly alkaline solvent systems for purifying of the 18F-labeled butyrophenone neuroleptics obtained by a single-step 18F-for-nitro exchange reaction. The method has been applied to the synthesis of two typical butyrophenone neuroleptics ([18F]haloperidol and [18F]spiperone) with high purity in high yield. With information concerning the optimized conditions for the 18F-for-nitro exchange reaction, the synthetic method would be useful for synthesizing various 18F-labeled compounds.
The Rapid Synthesis of High Purity [<sup>18</sup>F]Butyrophenone Neuroleptics from Nitro Precursors for PET Study
作者:Kazunari Hashizume、Naoto Hashimoto、Hiroo Kato、David G. Cork、Yoshihiro Miyake
DOI:10.1246/cl.1995.303
日期:1995.4
We have completed rapid syntheses of [18F]butyrophenone neuroleptics ([18F]haloperidol and [18F]spiperone) from their nitro precursors in high radiochemical yields (up to 21%) by combining a one-step nitro-fluoro exchange reaction and a novel high performance liquid chromatography (HPLC) separation method. The synthesis time was ca. 95 min and both the radiochemical and chemical purities of the labeled products were over 99%.