Compounds containing the adamantane subunit have long been of interest to chemists due to the rigid structure and well-defined substitution chemistry of adamantane. l The discovery of the potent antiviral activity of amantadine (1-aminoadamantane) and rimantadine (a- methyl-l-adamantylmethylamine) has stimulated interest in the synthesis of adamantane- containing compounds. 2 The significant neuroprotective properties of the NMDA ...