[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[NH:11][C:10](=[O:12])[CH2:9][N:8]=[C:7]([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=3)[C:6]=2[CH:19]=1.Cl[CH2:21]Cl.[OH-].[Na+].S(OC)(OC)(=O)=O>O>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[N:11]([CH3:21])[C:10](=[O:12])[CH2:9][N:8]=[C:7]([C:13]3[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=3)[C:6]=2[CH:19]=1Dissolve 5.4 g. (0.02 moles) of 7-chloro-1,3-dihydro-5-phenyl-2H-1,4-benzodiazepin-2-one (e.g. product of Example 3) in 35 ml. of dichloromethane and add to this solution 1.2 g. of NaOH (1.5 moles) dissolved in 17 ml. of water. Cool the mixture with good agitation to 0° C. and add slowly 3.8 g. (0.03 moles) of dimethyl sulfate with good cooling and stirring. After all the dimethyl sulfate is added remove the cooling bath and continue stirring for an additional 2 hours. Add water and methylene chloride to the reaction mixture. Separate the layers and wash the methylene chloride layers with water. Dry the organic solution over anhydrous sodium sulfate and evaporate. After recrystallization, 7-chloro-1,3-dihydro-1-methyl-5-phenyl-2H-1,4-benzodiazepin-2-one is obtained which after drying under vacuum at 110° C. shows a melting point of 129.5°-130.5° (corr.) and no depression on mixed melt with an authentic sample.
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