[NH2:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:9]=[CH:10][C:11]3[O:17][CH2:16][CH2:15][N:14](C(OC(C)(C)C)=O)[CH2:13][C:12]=3[CH:25]=2)=[CH:4][C:3]=1[N+:26]([O-:28])=[O:27].CO.[ClH:31]>O1CCOCC1.C(OCC)C>[ClH:31].[N+:26]([C:3]1[CH:4]=[C:5]([C:8]2[CH:9]=[CH:10][C:11]3[O:17][CH2:16][CH2:15][NH:14][CH2:13][C:12]=3[CH:25]=2)[CH:6]=[CH:7][C:2]=1[NH2:1])([O-:28])=[O:27]1,1-dimethylethyl 7-(4-amino-3-nitrophenyl)-2,3-dihydro-1,4-benzoxazepine-4(5H)-carboxylate (example 8, step 1) (6.0 g, 15.6 mmol) was taken into warm methanol (50 mL) followed by addition of 4M hydrogen chloride in dioxane (50 mL) in portions and the warm solution was allowed to slowly cool to room temperature over 1 h. The mixture was diluted with ethyl ether (100 mL) and the yellow solid was collected by filtration and dried to give 2-nitro-4-(2,3,4,5-tetrahydro-1,4-benzoxazepin-7-yl)aniline hydrochloride salt (3.61 g, 72% yield) as a yellow solid. 1H NMR (400 MHz, D2O): 7.79 (s, 1H), 7.44 (d, 1H), 7.29 (s, 1H), 7.26 (d, 1H), 7.02 (d, 1H), 6.82 (d, 1H), 4.34 (s, 2H), 4.32 (br m, 2H), 3.67 (br m, 2H).
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