Thionyl Chloride → Methyl 5-amino-2-nitrobenzoate

Participants

Reaction Steps

5-Amino-2-nitro-benzoic acid (compound A′) (910 mg) was dissolved in methanol (50 ml). Thionyl chloride (0.74 ml) was added dropwise to the solution on an ice bath, and a reaction was allowed to proceed under reflux with heating for 12 hr. After the completion of the reaction, the reaction solution was allowed to stand for cooling to room temperature and was then concentrated under the reduced pressure. The residue was purified by column chromatography eluted with a chloroform-methanol system to give 5-amino-2-nitro-benzoic acid methyl ester (410 mg, yield 42%).

Provenance & Evidence