Cl[CH2:2][CH2:3][CH2:4][N:5]1[CH2:10][CH2:9][S:8][C:7]2[CH:11]=[C:12]([N+:15]([O-:17])=[O:16])[CH:13]=[CH:14][C:6]1=2.Cl.[CH3:19][NH2:20].[I-].[K+].C(=O)([O-])[O-].[K+].[K+]>C(#N)C.O>[CH3:19][NH:20][CH2:2][CH2:3][CH2:4][N:5]1[CH2:10][CH2:9][S:8][C:7]2[CH:11]=[C:12]([N+:15]([O-:17])=[O:16])[CH:13]=[CH:14][C:6]1=2
A solution of 4-(3-chloropropyl)-7-nitro-3,4-dihydro-2H-benzo[b][1,4]thiazine (1.1 g, 4.03 mmol), methylamine hydrochloride (0.545 g, 8.07 mmol), potassium iodide (0.669 g, 4.03 mmol), and potassium carbonate (2.79 g, 20.16 mmol) in dry acetonitrile (25 mL) was stirred at 80° C. in a sealed tube for 6 hours. The reaction was brought to room temperature and diluted with water (100 mL), and the product was extracted into ethyl acetate (3×25 mL). The combined ethyl acetate layers were washed with brine (20 mL) and dried (Na2SO4). The solvent was evaporated, and the crude material was purified by flash column chromatography (1:9 (2M NH3 in MeOH):CH2Cl2) on silica gel to obtain the title compound (0.8 g, 74%) as a thick syrup. 1H NMR (DMSO-d6) δ 7.84-7.81 (m, 2H), 6.86 (d, 1H, J=9.9 Hz), 3.78-3.75 (m, 2H), 3.50 (t, 2H, J=7.5 Hz), 3.08-3.04 (m, 2H), 2.48 (t, 2H, J=6.9 Hz), 2.27 (s, 3H), 1.74-1.64 (m, 2H); ESI-MS (m/z, %): 268 (MH+, 100).
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