Dimethylacetamide → 8-Benzyloxy-1,3,3-trimethyl-1,5-dihydrobenzo[b][1,4]diazepine-2,4-dione

Beteiligte Stoffe

Reaktionsschritte

Under ice cooling, a N,N-dimethylacetamide (3 mL) solution of dimethylmalonic acid dichloride (0.68 g, 4.0 mmol) was added dropwise to a N,N-dimethyl acetamide (5 mL) suspension of 5-benzyloxy-N1-methylbenzene-1,2-diamine ½ sulfate (1.11 g, 4.0 mmol). After the reaction solution was stirred at the same temperature for 4 hours, water (8 mL) was added. The mixture was stirred at 10° C. or less for 30 minutes, and precipitated crystals were collected by filtration. The resulting crystals were washed with water, and dried at 60° C., thereby obtaining 0.75 g of a slightly pink, powdery target compound (yield: 57.8%).

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