Sodium hydride → 1-(1-Adamantyl)methyl-2,4-dioxo-5-phenyl-2,3,4,5-tetrahydro-1H-1,5-benzodiazepine

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Sodium hydride 80% dispersion in oil (0.07 g) was added portionwise to a solution of 2,4-dioxo-5-phenyl-2,3,4,5-tetrahydro-1H-1,5-benzodiazepine (0.5 g) in DMF (50 ml). The reaction mixture was stirred for 30 min, then a solution of 1-adamantylmethyl methanesulfonate (0.537 g) in DMF (3 ml) was added. The reaction mixture was stirred at 120° for 7 h and at 23° for 15 h, then concentrated. The residue was diluted with ethyl acetate (100 ml) washed with brine (2×30 ml) and water (50 ml), dried and concentrated "in vacuo". The crude product was purified by flash chromatography (eluting with CH-EA 1:1) to give the title compound as a white foam (0.15 g). T.l.c. CH-EA (1:1), Rf =0.42.

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