Water → 2-Bromo-6-isothiocyanatopyridine
反応式
[Br:1][C:2]1[N:7]=[C:6]([NH2:8])[CH:5]=[CH:4][CH:3]=1.C(=O)(O)[O-].[Na+].O.[C:15](Cl)(Cl)=[S:16]>C(Cl)(Cl)Cl>[Br:1][C:2]1[CH:3]=[CH:4][CH:5]=[C:6]([N:8]=[C:15]=[S:16])[N:7]=1[Br:1][C:2]1[N:7]=[C:6]([NH2:8])[CH:5]=[CH:4][CH:3]=1.C(=O)(O)[O-].[Na+].O.[C:15](Cl)(Cl)=[S:16]>C(Cl)(Cl)Cl>[Br:1][C:2]1[CH:3]=[CH:4][CH:5]=[C:6]([N:8]=[C:15]=[S:16])[N:7]=1A mixture of 6-bromopyridin-2-amine (253 mg, 1.46 mmol), chloroform (2 mL), sodium bicarbonate (850 mg, 10.12 mmol) and water (3 mL) was assembled, and to this was added a solution of thiophosgene (190 mg, 1.65 mmol) in chloroform (1 mL). The reaction mixture was stirred at room temperature for 4 hours. The reaction mixture was transferred to a separatory funnel and partitioned between ethyl acetate and water. The organic layer was washed with brine, dried over magnesium sulfate, filtered and the solvent evaporated to give a yellow solid. The solid was purified by column chromatography (5% ethyl acetate/hexanes) to afford 2-bromo-6-isothiocyanatopyridine (281 mg, 1.31 mmol, 89% yield) as a white solid. 1H NMR (500 MHz, CDCl3) δ ppm 7.50-7.62 (m, 1H), 7.34-7.43 (m, 1H), 6.91-7.11 (m, 1H). MS (LC/MS) R.T.=1.92; [M+H]+=216.86.
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