Synthesis of [11C]CX-6258 as a new PET tracer for imaging of Pim kinases in cancer
作者:Min Wang、Reynaldo Tzintzun、Mingzhang Gao、Zhidong Xu、Qi-Huang Zheng
DOI:10.1016/j.bmcl.2015.07.061
日期:2015.9
The reference standard CX-6258 (E)-5-chloro-3-((5-(3-(4-methyl-1,4-diazepane-1-carbonyl) phenyl) furan-2-yl) methylene) indolin-2-one, 4a} and its desmethylated precursor N-desmethyl-CX-6258 (E)-3-((5-(3-(1,4-diazepane-1-carbonyl) phenyl) furan-2-yl) methylene)-5-chloroindolin-2-one, 5} for radiolabeling were synthesized from 5-bromo-2-furaldehyde and 3-carboxybenzeneboronic acid in 3 and 4 steps with 29-49% and 24-32% overall chemical yield, respectively. The target tracer [C-11] CX-6258 (E)-5-chloro-3-((5-(3-(4-[11C] methyl-1,4-diazepane-1-carbonyl) phenyl) furan-2-yl) methylene) indolin-2-one, [C-11] 4a} was prepared from N-desmethyl-CX-6258 (5) with [C-11] CH3OTf under basic condition (2 N NaOH) through N-[C-11] methylation and isolated by HPLC combined with solid-phase extraction (SPE) in 40-50% radiochemical yield based on [C-11] CO2 and decay corrected to end of bombardment (EOB) with 370-1110 GBq/mu mol specific activity at EOB. (C) 2015 Elsevier Ltd. All rights reserved.