I[CH2:2][CH2:3][S:4][C:5]1[CH:10]=[CH:9][C:8]([N+:11]([O-:13])=[O:12])=[CH:7][C:6]=1[NH:14][CH:15]1[CH2:20][CH2:19][N:18]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:17][CH2:16]1.C(=O)([O-])[O-].[K+].[K+]>CN(C=O)C.C(OCC)(=O)C>[N+:11]([C:8]1[CH:9]=[CH:10][C:5]2[S:4][CH2:3][CH2:2][N:14]([CH:15]3[CH2:20][CH2:19][N:18]([C:21]([O:23][C:24]([CH3:27])([CH3:26])[CH3:25])=[O:22])[CH2:17][CH2:16]3)[C:6]=2[CH:7]=1)([O-:13])=[O:12]To a stirred solution of tert-butyl 4-(2-(2-iodoethylthio)-5-nitrophenylamino)piperidine-1-carboxylate (1.49 g, 2.94 mmol) in DMF (10 mL) was added potassium carbonate (0.812 g, 5.87 mmol). The resulting mixture was stirred at 90° C. for 3 hours. The reaction mixture was then diluted with ethyl acetate and washed sequentially with water and saturated sodium carbonate (2×). The organic phase was dried, filtered, concentrated, and then chromatographed in 1:4 ethyl acetate:hexanes, giving the desired product (473 mg, 42.4%) as an orange foam. 1H NMR (DMSO-d6) δ 7.57 (d, J=2.4 Hz, 1H), 7.41 (dd, J=8.7, 2.4 Hz, 1H), 7.22 (d, J=8.7 Hz, 1H), 4.09-3.88 (m, 3H), 3.47-3.42 (m, 2H), 3.12-3.08 (m, 2H), 3.01-2.85 (m, 2H), 1.72-1.51 (m, 4H), 1.41 (s, 9H); ESI-MS (m/z, %): 402 (M+Na, 95), 380 (MH+, 28), 324 (100), 280 (55).
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