N-Methylamide-structured SB366791 derivatives with high TRPV1 antagonistic activity: toward PET radiotracers to visualize TRPV1
RSC Medicinal Chemistry(2022)
Abstract
Transient receptor potential cation channel subfamily V member 1 (TRPV1)-targeted compounds were synthesized by modifying the structure of SB366791, a pharmaceutically representative TRPV1 antagonist. To avoid amide-iminol tautomerization, structurally supported N-methylated amides (i.e., 3-alkoxy-substitued N-meythylamide derivatives of SB366791) were evaluated using a Ca2+ influx assay, in which cells expressed recombinant TRPV1 in the presence of 1.0 mu M capsaicin. The antagonistic activities of N-(3-methoxyphenyl)-N-methyl-4-chlorocinnamamide (2) (RLC-TV1004) and N-{3-(3-fluoropropoxy)phenyl}-N-methyl-4-chlorocinnamamide (4) (RLC-TV1006) were found to be approximately three-fold higher (IC50: 1.3 mu M and 1.1 mu M, respectively) than that of SB366791 (IC50: 3.7 mu M). These results will help reinvigorate the potential of SB366791 in medicinal chemistry applications. The 3-methoxy and 3-fluoroalkoxy substituents were used to obtain radioactive [C-11]methoxy- or [F-18]fluoroalkoxy-incorporated tracers for in vivo positron emission tomography (PET). Using the C-11- or F-18-labeled derivatives, explorative PET imaging trials were performed in rats.
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Key words
high trpv1,pet radiotracers,sb366791 derivatives,methylamide-structured
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