[CH3:1][N:2]1[C:8]2[CH:9]=[CH:10][CH:11]=[CH:12][C:7]=2[NH:6][C:5](=[S:13])[C:4]2=[CH:14][S:15][CH:16]=[C:3]12.O1CCOC[CH2:18]1.[OH-].[K+].S([O-])(OC)(=O)=O>CO>[CH3:1][N:2]1[C:8]2[CH:9]=[CH:10][CH:11]=[CH:12][C:7]=2[N:6]=[C:5]([S:13][CH3:18])[C:4]2=[CH:14][S:15][CH:16]=[C:3]12To a stirred suspension of 0.7 g. of 4,9-dihydro-4-methyl-10H-thieno[3,4-b][1,5]benzodiazepin-10-thione in 10 ml. of dioxane is added dropwise and simultaneously at 30°-40° C., a solution of 0.95 g. of potassium hydroxide in 10 ml. of methanol and 0.8 ml. of methyl sulfate. After addition is complete the mixture is stirred for 3 hours, diluted with methanol and filtered. The filtrate is concentrated to about 20 ml., diluted with water and extracted with chloroform. The chloroform solution is concentrated to give a solid, which is recrystallized from methanol-water to give orgnae crystals, m.p. 113°-115° C.
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