[F:1][C:2]1[C:3]([C:13]#[N:14])=[CH:4][C:5]2[S:9][C:8]([S:10][CH3:11])=[N:7][C:6]=2[CH:12]=1.[H-].[Al+3].[Li+].[H-].[H-].[H-].O.[OH-].[Na+]>C1COCC1>[F:1][C:2]1[C:3]([CH2:13][NH2:14])=[CH:4][C:5]2[S:9][C:8]([S:10][CH3:11])=[N:7][C:6]=2[CH:12]=1
To a stirred mixture of 5-fluoro-2-(methylthio)benzo[d]thiazole-6-carbonitrile in anhydrous THF (20 mL) at −20° C. under argon was added dropwise lithium aluminum hydride (2 M solution in THF, 11.7 mL, 5.9 mmol). After 1 h, water (500 μL) and 1 M aq NaOH (500 μL) were added slowly to the reaction mixture. After 5 minutes, additional water (2 mL) was added and the mixture was stirred at rt for 30 minutes. The mixture was filtered and the filtrate was concentrated under reduced pressure. The residue was purified by silica gel flash chromatography eluting with 5% MeOH in CH2Cl2 to afford (5-fluoro-2-(methylthio)benzo[d]thiazol-6-yl)methanamine (128 mg, 29%) as a colorless oil. 1H NMR (500 MHz, DMSO-d6) δ 8.07 (d, J=7.1 Hz, 1H), 7.64 (d, J=11.1 Hz, 1H), 3.83 (s, 2H), 2.78 (s, 3H), 1.80-2.06 (m, 2H); LCMS (ESI) m/z 229 (M+H)+.
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