2-Bromoethanol → 11b-(2-Chlorophenyl)-7-(2-hydroxyethyl)-10-nitro-2,3,5,11b-tetrahydrooxazolo[3,2-d][1,4]benzodiazepin-6(7H)-one

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A solution of 1.5 g (0.0041 M) of 11b-(2-chlorophenyl)-10-nitro-2,3,5,11b-tetrahydrooxazolo[ 3,2-d][1,4]benzodiazepin-6(7H)-one in 30 ml of dry N,N-dimethylformamide was treated with 0.34 g (0.008 M) of a 57% dispersion of sodium hydride in mineral oil with stirring under nitrogen. After 30 min, 1.5 g (0.012 M) of 2-bromoethanol was added and the reaction was heated to 90° for 3 hr. The solvent was removed under vacuum, and the residue was dissolved in 50 ml of dichloromethane which was then washed with 50 ml of water, 25 ml of a saturated solution of brine, dried over anhydrous sodium sulfate and evaporated to dryness. The residue was crystallized from ether, and recrystallized from a mixture of dichloromethane and methanol to give the product as pale yellow prisms, m.p. 185° -190° (dec.).

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