Synthesis of the NK3 receptor antagonist AZD2624 in C-14-, H-3- and C-13-labeled forms
作者:Charles S. Elmore、Peter N. Dorff、Mark E. Powell、James E. Hall、Thomas R. Simpson
DOI:10.1002/jlcr.1858
日期:2011.5.15
treatment for schizophrenia, three labeled forms of the NK3receptorantagonistAZD2624 have been prepared. [3H2]AZD2624 was synthesized by tritiodehalogenation for use in receptor occupancy and autoradiographic studies. [13C6]AZD2624 was prepared for use as an internal standard through the intermediacy of [13C6]isatin, and two C-14 isotopomers of AZD2624 were prepared from [14C]benzoic acid and [14C]isatin
[carbonyl-14C]-4-Benzoylbenzoic acid, a photolabelling reagent, was synthesised with high specific activity in 57% radioactive yield from [carboxyl-14C]-benzoic acid. Radioactive synthesis allowed elucidation of the mechanism of a previous unlabelled synthesis using benzoic acid, methyl ester. An improvement in the experimental conditions led to a new synthesis of radioactive benzoylbenzoic derivatives with good
A simple, efficient method for generation of (CO)-C-14 from (BaCO3)-C-14 has been developed. Reduction of (CO2)-C-14 using LiBEt3H gave [C-14]formate in good yield which was treated with cone. H2SO4 to effect dehydration to (CO)-C-14. Through direct attachment of a reaction vessel containing aryl substrate and Pd(0) catalyst, [C-14]carbonylation reactions were performed without the use of a mercury transfer pump. [C-14]Carbonylation reactions using (CO)-C-14 generated in this manner have been shown to proceed in good yield with a variety of substrates.
Syntheses of N-t-butyl-?-phenylnitrone-?-14C and ?-(4-pyridyl-1-oxide)-N-t-butylnitrone-?-14C
作者:Diem Duy Le、Yinsheng Zhang、David H. Chien、Josef Moravek
N-t-Butyl-alpha-phenylnitrone-alpha-C-14 was prepared from benzoic-alpha-C-14 acid via benzyl alcohol in 40 - 55% yield (sp. activity: 30 mCi/mmol). alpha-(4-Pyridyl-1-oxide)-N-t-butylnitrone-alpha-C-14 arrived from (BaCO3)-C-14 via carboxylation of 4-bromopyridine in 7 - 22% yield (sp. activity: 23 mCi/mmol). Both radiolabelled spin traps showed >99% radiochemical purity by HPLC and suffered <1% loss after 1 - 1.5 months storage under the conditions specified.
RIDGE D. N.; HANIFIN J. W.; HARTEN L. A.; JOHNSON B. D.; MENSCHIK J.; NIC+, J. MED. CHEM., 1979, 22, NO 11, 1385-1389
作者:RIDGE D. N.、 HANIFIN J. W.、 HARTEN L. A.、 JOHNSON B. D.、 MENSCHIK J.、 NIC+