[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[NH:12][C:11](=[O:13])[CH2:10][CH2:9]S(=O)(=O)[CH:7]([C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][C:17]=3[F:22])[C:6]=2[CH:23]=1.C(O)(C)(C)C.O>C(Cl)(Cl)(Cl)Cl>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]2[NH:12][C:11](=[O:13])[CH2:10][CH:9]=[C:7]([C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][C:17]=3[F:22])[C:6]=2[CH:23]=167.0 g of 8-chloro-6-(2-fluorophenyl)-1,3,4,6-tetrahydro-2-oxo-2H-5,1-benzothiazocine 5,5-dioxide are suspended in a mixture of 670 ml of carbon tetrachloride, 670 ml of t-butanol and 31.5 ml of water. The suspension is pre-warmed to 35° C. There are then rapidly added thereto while cooling four 51.5 g portions of potassium t-butylate (the temperature amounts to 45°-50°). The mixture is stirred for a further 35 minutes, the temperature dropping to about 35°. The mixture is poured on to ice, whereupon it is extracted with methylene chloride. The organic phase is evaporated and the residue is triturated with ether. The crystalline product is filtered off. There is obtained 7-chloro-5-(2-fluorophenyl)-1,3-dihydro-2H-1-benzazepin-2-one of melting point 214°-215°.
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