[CH3:1][N:2]1[C:8]2[CH:9]=[CH:10][CH:11]=[CH:12][C:7]=2[N:6]=[C:5](SC)[C:4]2=[CH:15][S:16][CH:17]=[C:3]12.[CH3:18][N:19]1[CH2:24][CH2:23][NH:22][CH2:21][CH2:20]1>C(O)(=O)C>[CH3:1][N:2]1[C:8]2[CH:9]=[CH:10][CH:11]=[CH:12][C:7]=2[N:6]=[C:5]([N:22]2[CH2:23][CH2:24][N:19]([CH3:18])[CH2:20][CH2:21]2)[C:4]2=[CH:15][S:16][CH:17]=[C:3]12A solution of 1.2 g. of 4-methyl-10-(methylthio)-4H-thieno[3,4-b][1,5]benzodiazepine in 6 ml. of N-methylpiperazine is treated with 2-3 drops of glacial acetic acid and heated under reflux for 4 days. The solution is concentratedto dryness and the residue is warmed with dilute acetic acid. The acidic solution is filtered, cooled, and made alkaline with concentrated ammonium hydroxide solution. The precipitate is collected, washed with water and dissolved in chloroform. The chloroform solution is dried and concentrated to an oil, which slowly crystallizes. Recrystallization from ethanol gives yellow crystals, m.p. 83°-85° C.
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