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A solution of 3-(2-aminoethylamino)benzo[b]thiophene-2-carboxylic acid methyl ester hydrochloride (339 mg, 1.18 mmol) and freshly prepared sodium methoxide (from 134 mg, 2.48 mmol of sodium) in 5 mL of methanol is heated at reflux for 18 hours. Upon cooling, the reaction is neutralized with 25 mL of 1N HCl and cooled to 0° C. for 1 hour. The resulting yellow crystalline material is filtered and dried under vacuum at 60° C. for several hours to provide 2,3-dihydro-1H-benzothieno [3,2-e]-1,4-diazepin-5-one in 64% yield. Chromatography, eluting with a gradient of 2% methanol in ethyl acetate in 5% methanol in ethyl acetate, gives analytically pure, 2,3-dihydro-1H-benzothieno-[3,2-e]-1,4-diazepin-5-one, mp 210°-212° C.

1. temperatureat reflux for 18 hours
2. temperatureUpon cooling
3. filtrationThe resulting yellow crystalline material is filtered
4. customdried under vacuum at 60° C. for several hours