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A new series of adamantane-isothiourea hybrid derivatives, namely 4-arylmethyl ( Z )- N '-(adamantan-1-yl)-morpholine-4-carbothioimidates 7a - e and 4-arylmethyl ( Z )- N '-(adamantan-1-yl)-4-phenylpiperazine-1-carbothioimidates 8a - e were prepared via the reaction of N -(adamantan-1-yl)morpholine-4-carbothioamide 5 and N -(adamantan-1-yl)-4-phenylpiperazine-1-carbothioamide 6 with benzyl or substituted benzyl bromides, in acetone, in the presence of anhydrous potassium carbonate. The structures of the synthesized compounds were confirmed by ¹H-NMR, 13 C-NMR, electrospray ionization mass spectral (ESI-MS) data, and X-ray crystallographic data. The in vitro antimicrobial activity of the new compounds was determined against certain standard strains of pathogenic bacteria and the yeast-like pathogenic fungus Candida albicans . Compounds 7b , 7d and 7e displayed potent broad-spectrum antibacterial activity, while compounds 7a , 7c , 8b , 8d and 8e were active against the tested Gram-positive bacteria. The in vivo oral hypoglycemic activity of the new compounds was carried on streptozotocin (STZ)-induced diabetic rats. Compounds 7a , 8ab , and 8b produced potent dose-independent reduction of serum glucose levels, compared to the potent hypoglycemic drug gliclazide.

Adamantane-Isothiourea Hybrid Derivatives: Synthesis, Characterization, In Vitro Antimicrobial, and In Vivo Hypoglycemic Activities