Radioiodination of new EGFR inhibitors as potential SPECT agents for molecular imaging of breast cancer
摘要:
In our search for the development of novel SPECT radioligands for EGFR positive tumours, new potentially irreversible tyrosine kinase (TK) inhibitors are being explored. The radioiodination of N-{4-[(3-chloro-4-fluorophenyl)amino]quinazoline-6-y}-3-bromopropionamide, a novel EGFR-TK inhibitor synthesised in our laboratory, was accomplished via halogen exchange. Purification by RP-HPLC gave [(125)1]-N-{4-[(3-chloro-4-fluorophenyl)amino]quinazoline-6-yl}-3-iodopropionamide with a radiochemical purity higher than 95% and a high specific activity. In vitro studies indicate that both iodinated quinazoline and its bromo precursor inhibit A431 cell growth and also possess higher potency than the parent quinazoline to inhibit the EGFR autophosphorylation. In vivo stability studies suggest metabolization of the radioiodinated quinazoline indicating a short biological half-life. The in vitro results point out that these quinazoline derivatives could be promising candidates for SPECT imaging of EGFR positive tumours provided that they are selectively modified in order to achieve better in vivo radiochemical stability. (C) 2007 Elsevier Ltd. All rights reserved.
Novel EGFR inhibitors prepared by combination of dithiocarbamic acid esters and 4-anilinoquinazolines
作者:Ri-Dong Li、Xin Zhang、Qiao-Yan Li、Ze-Mei Ge、Run-Tao Li
DOI:10.1016/j.bmcl.2011.04.096
日期:2011.6
basis of combination strategy, a novel series of EGFRinhibitors were designed and synthesized by combination of dithiocarbamicacidesters and 4-anilinoquinazolines. The effect of the synthesized compounds on cell proliferation was evaluated by MTT assay in three human cancer cell lines: MDA-MB-468, SK-BR-3 and HCT-116. Two compounds (11d and 11f) were found more potent against all three cell lines and
the tricarbonyl approach, the fac-[Tc(CO)3]+ unit is anchored by two different monoanionic chelators bearing the quinazoline derivatives (3-chloro-4-fluorophenyl)quinazoline-4,6-diamine (2) and (3-bromophenyl)quinazoline-4,6-diamine (3). Both chelators have a N2O donor atom set, but one contains a pyrazolyl ring (L55H) and the other contains a pyridineunit (L66H). In both cases the conjugation of