Abstract
Macahydantoins A (1) and B (2), two new thiohydantoin derivatives with an unprecedented skeleton, were isolated from maca (Lepidium meyenii). Their structures and absolute configurations were fully established by extensive spectroscopic and computational methods. The totally chemical synthesis of macahydantoin A was achieved via benzylamine and methyl piperidine-3-carboxylate hydrochloride through nucleophilic addition and intramolecular dehydration condensation.
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