O.O.O.O.O.O.O.O.O.[S-2:10].[Na+].[Na+].[Cl:13][C:14]1[CH:15]=[CH:16][C:17]2[N:23]([CH2:24][CH2:25]Cl)[CH:22]([CH2:27]Cl)[CH2:21][N:20]=[C:19]([C:29]3[O:30][CH:31]=[CH:32][CH:33]=3)[C:18]=2[CH:34]=1.ClC1CN=C(C2OC=CC=2)C2C=CC(Cl)=CC=2N(CCCl)C1.C(Cl)(Cl)Cl>O.O1CCOCC1>[Cl:13][C:14]1[CH:15]=[CH:16][C:17]2[N:23]3[CH2:24][CH2:25][S:10][CH2:27][CH:22]3[CH2:21][N:20]=[C:19]([C:29]3[O:30][CH:31]=[CH:32][CH:33]=3)[C:18]=2[CH:34]=18.5 g of disodium sulphide nonahydrate in 75 ml of water are added to a solution of 12.7 g of 7-chloro-1-(β-chloroethyl)-2-chloromethyl-5-(2-furyl)-2,3-dihydro-1H-1,4-benzodiazepine (or a mixture of this compound and the isomeric 3,9-dichloro-1-(β-chloroethyl)-6-(2-furyl)-1,2,3,4-tetrahydro-1,5-benzodiazocine (for the preparation see Example 5B) in 150 ml of dioxane, and the reaction mixture is heated under reflux for 5 hours. After the solvent has been stripped off in vacuo, the crude reaction product is isolated from chloroform and is then purified by chromatography on aluminium oxide of activity level II, using methylene chloride, and crystallised from ether. 9.7 g of 1,2,4,4a-tetrahydro-9-chloro-7-(2-furyl)-5H-[1,4]-thiazino[4,3-a][1,4]benzodiazepine are obtained. Melting point: 138° to 140° C.
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