Synthesis of [carbonyl-11C]acetophenone via the Stille cross-coupling reaction of [1-11C]acetyl chloride with tributylphenylstannane mediated by Pd2(dba)3/P(MeNCH2CH2)3N·HCl
摘要:
The Stille cross-coupling reaction of [1-C-11]acetyl chloride with tributylphenylstannane leading to [carbonyl-C-11]acetophenone was studied with the goal of developing a new C-11-labeling method for positron emission tomography tracer synthesis. The coupled product [carbonyl-C-11]acetophenone was synthesized using the Pd-2(dba)(3)/P(MeNCH2CH2)(3)N center dot HCl system with a 60-61% radiochemical conversion from [1-C-11]acetyl chloride (decay-corrected, n = 3). (C) 2009 Elsevier Ltd. All rights reserved.
Palladium-Mediated11C-Carbonylative Cross-Coupling of Alkyl/Aryl Iodides with Organostannanes: An Efficient Synthesis of Unsymmetrical Alkyl/Aryl [11C-carbonyl]Ketones
作者:Farhad Karimi、Julien Barletta、Bengt Långström
DOI:10.1002/ejoc.200400883
日期:2005.6
Palladium-mediated 11C-carbonylative cross coupling of alkyl / aryl iodides with organostannanes. An efficient synthesis of un-symmetrical alkyl - aryl [carbonyl-11C]ketones
Aryl triflates, methyl- or arylboronic acids, and a low concentration of [11C]carbon monoxide were employed on small scale in the syntheses of fifteen 11C-labelled ketones using palladium-mediated ...
[11C]Carbon monoxide in the palladium-mediated synthesis of 11C-labelled ketones
作者:Pelle Lidström、Tor Kihlberg、Bengt Långström
DOI:10.1039/a703062b
日期:——
[11C]Carbon monoxide has been used in the
palladium-mediated synthesis of
[carbonyl-11C]ketones. Methyl iodide, vinylic and
arylic halides and trifluoromethanesulfonates (triflates) have been
coupled with tin reagents with insertion of [11C]carbon
monoxide at very low concentrations (10–100 nmol
[11C]CO in a total volume of 10 ml). The labelled products
are obtained in 36–62% isolated decay-corrected radiochemical
yields within 30 min of the end of radionuclide production. In order to
use [11C]carbon monoxide efficiently, a gas handling system
has been developed which allows the radioactive gas to recirculate
through the reaction media. The reactions are performed using a one pot
procedure. The best results are achieved with mixed tin reagents
containing an unsaturated transferable substituent and
Pd(AsPh3)4. In a typical experiment starting from
25 GBq of [11C]carbon dioxide, 4.2 GBq (47%) of
[carbonyl-11C]acetophenone 1 is obtained 30 min
after the end of radionuclide production. The specific radioactivity of
1 is 91 GBq µmol-1.
[carbonyl-13C]Benzophenone 6 has been synthesised
using the same approach to verify the position of the label.