Abstract

Adamantylation of indazole and its C-nitro derivatives with 1-hydroxyadamantane in mineral acids yields exclusively the corresponding 1-(1-adamantyl)indazoles via attack by 1-adamantyl cation on the protonated substrate. The oxidative alkylation with 1-iodoadamantane leads to formation of 1- and 2-(1-adamantyl)indazoles, the 2-isomer prevailing.

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