[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[N:11]([CH2:12][CH2:13]Cl)[CH:10]([CH2:15]Cl)[CH2:9][N:8]=[C:7]([C:17]3[O:18][CH:19]=[CH:20][CH:21]=3)[C:6]=2[CH:22]=1.[OH-].[Na+].[CH3:25][NH2:26]>CO.O>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[N:11]3[CH2:12][CH2:13][N:26]([CH3:25])[CH2:15][CH:10]3[CH2:9][N:8]=[C:7]([C:17]3[O:18][CH:19]=[CH:20][CH:21]=3)[C:6]=2[CH:22]=13.4 g of 7-chloro-1-(β-chloroethyl)-2-chloromethyl-5-(2-furyl)-2,3-dihydro-1H -1,4-benzodiazepine in 100 ml of methanol are left to react with 0.8 g of sodium hydroxide in 1 ml of water and 2.5 g of methylamine at 95° C. in an autoclave for 5 hours. The reaction mixture is then worked up in the customary manner and the reaction product is purified by chromatography on aluminium oxide of activity level II, using methylene chloride/chloroform, and the fractions containing the product of medium polarity are separated off and the 1,2,3,4,4a,5-hexahydro-9-chloro-3-methyl-7-(2-furyl)-pyrazino[1,2-a]-[1,4]benzodiazepine obtained therefrom is dissolved in isopropanol and converted into its salt with alcoholic hydrochloric acid. This salt crystallises from isopropanol as the dihydrochloride hemihydrate with 0.1 mol of isopropanol. Melting point: >240° C., yield: 0.8 g.
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