Ligands for neuronal receptors are important for understanding the biological functions as well as for treatment of neuronal diseases associated with. Here, we report diverted synthesis and biological evaluation of four C-ring analogs of IKM-159, a subtype-selective inhibitor for (S)-2-amino-3-(3-hydroxy-5-methyl-4-isoxazolyl)propionic acid (AMPA)-type ionotropic glutamate receptor. Starting from iodinated 7-oxanorbornene 7, those analogs 3-6 were successfully synthesized in 7.0-33% yields over 8-11 steps via a common intermediate 13. Intracerebroventricular injection of those analogs on mice showed that introduction of oxo group on the C-ring (analogs 4, 5) or cleavage of the C-ring (analog 6) caused significant loss of the activity, while the ether analog 3 still retain the suppressed motor activity, indicating the importance of the C-ring in the neuronal activity of IKM-159.
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