Potassium Carbonate → 2-(7-chloro-3-(2-chlorobenzyl)-2,5-dioxo-2,3,4,5-tetrahydro-1H-benzo[e][1,4]diazepin-1-yl)ethyl acetate

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Reaction Steps

To 7-chloro-3-(2-chlorobenzyl)-3,4-dihydro-1H-benzo[e][1,4]diazepine-2,5-dione (0.5 g, 1.5 mmol) in N,N-dimethylformamide (10 mL), was added powdered potassium carbonate (0.31 g, 2.2 mmol) followed by 2-bromoethylacetate (0.17 mL, 1.6 mmol). The mixture was stirred at ambient temperature overnight. After 20 hours, more 2-bromoethylacetate (0.05 mL, 0.5 mmol) was added and stirring was continued at ambient temperature overnight. The reaction mixture was diluted with ethyl acetate (100 mL), washed with water (3×50 mL), washed with brine (50 mL), dried with anhydrous sodium sulfate, decanted, and concentrated to yield crude 2-(7-chloro-3-(2-chlorobenzyl)-2,5-dioxo-2,3,4,5-tetrahydro-1H-benzo[e][1,4]diazepin-1-yl)ethyl acetate, which was used directly in the next step without further purification. MS (m/z): 421.1 (M+H)+.

Provenance & Evidence