3-(Methylthio)propanoic acid → 1-(1H-benzo[d][1,2,3]triazol-1-yl)-3-(methylthio)propan-1-one

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Reaction Steps

Sulfurous dichloride (4.95 g, 41.6 mmol) was added to a stirred solution of 1H-benzo[d][1,2,3]triazole (19.83 g, 166 mmol) in anhydrous dichloromethane (300 mL) at room temperature under argon. The mixture was stirred for 30 min and 3-(methylthio)propanoic acid (5.0 g, 41.6 mmol) was added in one portion and stirring was continued for 2 h. The resulting suspension was filtered off and the filtrated was washed with 2 M NaOH (3×50 mL), dried over MgSO4, and purified by column chromatography to give the title compound as clear oil (5.12 g). LCMS m/z=222.1 [M+H]+; 1H NMR (400 MHz, CDCl3) δ ppm 2.21 (s, 3H), 3.05 (t, J=7.07 Hz, 2H), 3.74 (t, J=7.07 Hz, 2H), 7.42-7.54 (m, 1H), 7.56-7.69 (m, 1H), 8.08 (d, J=8.34 Hz, 1H), 8.24 (d, J=8.08 Hz, 1H).

Provenance & Evidence