5-Hydroxy-2-nitrobenzoic acid → Methyl 5-hydroxy-2-nitrobenzoate

Participants

Reaction Conditions

Reaction Steps

5-Hydroxy-2-nitro-benzoic acid (compound A′) (2.0 g) was dissolved in methanol (30 ml). Thionyl chloride (3.0 ml) was added dropwise to the solution on an ice bath, and the mixture was then stirred at 75° C. for 96 hr. After the completion of the reaction, the reaction solution was neutralized with a saturated aqueous sodium hydrogencarbonate solution and was then subjected to separatory extraction with ethyl acetate. The organic layer was washed with saturated brine, was dried over sodium sulfate, and was then concentrated under the reduced pressure to give crude 5-hydroxy-2-nitro-benzoic acid methyl ester (2.2 g, crude yield 100%).

Provenance & Evidence