Sodium hydride → t-butyl (R)-(2,3,4,5-tetrahydro-4-methyl-2,5-dioxo-1H-1,4-benzodiazepin-1-ylmethyl)-2,2-dimethyl-3-oxazolidinecarboxylate

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Reaction Steps

1.1 g. of sodium hydride dispersion (60%) are suspended in 50 ml of DMF. 5.23 g of 4-methyl-3H-1,4-benzodiazepine-2,5(1H, 4H)-dione are added thereto so that the temperature does not exceed 35° C. and the mixture is stirred at room temperature for 90 minutes. Subsequently, a solution of 5.3 g of t-butyl (S)-2,2-dimethyl-4-(p-tolylsulfonyloxymethyl)-3-oxazolidinecaboxylate (Example 6a) in 50 ml of DMF is added thereto and the mixture is stirred at 50° C. overnight. The reaction mixture is evaporated and the residue is taken up in ethyl acetate, washed with water and dried. After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1). There are obtained 1.85 g of t-butyl (R)-(2,3,4,5-tetrahydro-4-methyl-2,5-dioxo-1H-1,4-benzodiazepin-1-ylmethyl)-2,2-dimethyl-3-oxazolidinecarboxylate.

Provenance & Evidence