Methanol → Benzoic acid, 2-hydroxy-3-methyl-, methyl ester

関与物質

反応手順

Into a 3-L 4-necked round-bottom flask purged and maintained with an inert atmosphere of nitrogen, was placed 2-hydroxy-3-methylbenzoic acid (50 g, 328.63 mmol, 1.00 equiv) and methanol (800 mL). This was followed by the addition of thionyl chloride (20 mL) dropwise with stirring. The resulting solution was stirred overnight at 80° C. The resulting mixture was concentrated under vacuum. The residue was diluted with 1000 mL of ethyl acetate. The resulting mixture was washed with 2×800 mL of NaOH (cold). The resulting mixture was washed with 2×500 mL of water. The mixture was dried over anhydrous sodium sulfate and concentrated under vacuum. This resulted in 25 g (46%) of methyl 2-hydroxy-3-methylbenzoate as brown oil. 1H NMR (300 MHz, DMSO-d6) δ 2.19 (s, 3H), 3.90 (s, 3H), 6.83-6.88 (m, 1H), 7.41-7.44 (m, 1H), 7.64-7.66 (m, 1H), 10.87 (b, 1H).

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