[Cl:1][CH2:2][C:3]([C:5]1[S:15][C:8]2[C:9](=[O:14])[NH:10][CH2:11][CH2:12][CH2:13][C:7]=2[CH:6]=1)=O.O>C([SiH](CC)CC)C.FC(F)(F)C(O)=O>[Cl:1][CH2:2][CH2:3][C:5]1[S:15][C:8]2[C:9](=[O:14])[NH:10][CH2:11][CH2:12][CH2:13][C:7]=2[CH:6]=1A mixture of 1.9 g of 2-chloroacetyl-4,5,6,7-tetrahydro-8H-thieno[2,3-c]azepin-8-one in 5.4 ml of triethylsilane and 15 ml of trifluoroacetic acid was stirred at 50° C. for 12 hours. The mixture was poured into water, alkali fled and extracted with ethyl acetate. The exract was washed with water, dried and concentrated. The residue was purified by column chromatography on a silica gel to give 0.85 g of 2-chloroethyl-4,5,6,7-tetrahydro-8H-thieno[2,3-c]azepin-8-one as white crystals, m.p. 156°-158° C.
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