Hydrochloric Acid → 3-Chloro-2-hydroxy-6-methylbenzaldehyde

Participants

Reaction Conditions

Reaction Steps

Paraformaldehyde (4.73 g, 163 mmol), magnesium chloride (7.76 g, 81.7 mmol) and triethylamine (14.2 ml, 102 mmol were added to a solution of 2-chloro-5-methylphenol (5.80 g, 40.8 mmol) in acetonitrile (100 ml) and the mixture was vigorously stirred at 90° C. for 10 hours. The reaction mixture was poured into 1N hydrochloric acid and extracted with ethyl acetate. After the organic layer was successively washed with 1N hydrochloric acid, water and a saturated aqueous NaCl solution and dried with anhydrous sodium sulfate, it was concentrated under reduced pressure. The obtained residue was subjected to silica gel column chromatography (eluting solvent: hexane/ethyl acetate=3/1) to give crude 3-chloro-2-hydroxy-6-methylbenzaldehyde. According to a method similar to Example (28-3) and Example (28-4), from the crude compound obtained in the above, tert-butyl 2-[(tert-butoxycarbonyl)oxy]-3-chloro-6-methylbenzoate was obtained (1.82 g, three-step total yield: 13%).

Provenance & Evidence