Br[C:2]1[C:10]2[C:5](=[N:6][CH:7]=[CH:8][CH:9]=2)[S:4][N:3]=1.[NH2:11][CH2:12][CH2:13][CH2:14][NH2:15]>CO.C(OCC)(=O)C>[S:4]1[C:5]2=[N:6][CH:7]=[CH:8][CH:9]=[C:10]2[C:2]([NH:11][CH2:12][CH2:13][CH2:14][NH2:15])=[N:3]1A mixture of 3-bromoisothiazolo[5,4-b]pyridine (1.9 g, 8.8 mmol), and 1, 3-diaminopropane (6.7 g, 90 mmol) in methanol (10 ml) was heated at 64° C. for 1.5 hours. The reaction mixture was cooled to room temperature and concentrated under reduced pressure. The crude reaction mixture was diluted with ethyl acetate and washed successively with saturated aqueous sodium bicarbonate solution and brine. The organic layer was dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. Lyophilization of the crude sample in acetonitrile/water mixture yielded N1-(isothiazolo[5,4-b]pyridin-3-yl)propane-1,3-diamine. 1H NMR (300 MHz, DMSO-d6): 8.68 (d, 1H), 8.53 (d, 1H), 7.73 (br s, 1H), 7.40 (dd, 1H), 3.46 (dd, 2H), 2.85 (t, 2H), 1.75 (t, 2H), 1.45 ppm (t, 2H). MW=208 confirmed by LC-MS, tr=5.55 min (Method Y) MH+=209.
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