[O:1]=[C:2]1[C:8]2[CH:9]=[CH:10][C:11]([C:13](O)=[O:14])=[CH:12][C:7]=2[S:6][C:5]2[CH:16]=[CH:17][CH:18]=[CH:19][C:4]=2[NH:3]1.B.C(OCC)(=O)C>O1CCCC1.O>[OH:14][CH2:13][C:11]1[CH:10]=[CH:9][C:8]2[C:2](=[O:1])[NH:3][C:4]3[CH:19]=[CH:18][CH:17]=[CH:16][C:5]=3[S:6][C:7]=2[CH:12]=1Dissolve 5.1 gm. of 10,11-dihydro-11-oxodibenzo[b,f][1,4]thiazepin-3-carboxylic acid in 100 cc. of tetrahydrofuran and add 35 cc. of 1 M borane in tetrahydrofuran at room temperature under a nitrogen atmosphere. Stir the mixture at room temperature for 3 hours. Slowly dilute the reaction mixture with water and then with ethyl acetate. Wash with aqueous sodium chloride, dry and evaporate to an oil.
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