Hydrochloric Acid → HCID 18794924, compound

Participants

Reaction Conditions

Reaction Steps

Into a 500 ml four-neck flask were charged 66.9 g (0.682 mol) of maleic anhydride and 150 ml of chlorobenzene under a nitrogen atmosphere. Then, the whole was cooled to 10° C. or lower and 67.6 g (0.507 mol) of aluminum chloride was added thereto. While temperature was maintained at 10 to 15° C., 23.2 ml (0.195 mol) of 1-chloro-2-methoxybenzene was added dropwise, followed by 51 hours of reaction at 20 to 30° C. After termination of the reaction was confirmed by HPLC analysis, the reaction solution was added dropwise to 200 ml of a 1N hydrochloric acid aqueous solution cooled to 0° C. to decompose excess aluminum chloride. Extraction with 400 ml of ethyl acetate was conducted and the organic layer was washed twice with 200 ml of a 1N hydrochloric acid aqueous solution. Then, the organic layer was extracted three times with 200 ml of a saturated sodium hydrogen carbonate aqueous solution to extract (E)-4-(3-chloro-4-methoxyphenyl)-4-oxo-2-butenoic acid into the aqueous layer, followed by adjusting the aqueous layer to pH 2.0. After 24 hours of stirring at 5° C., filtration was carried out to obtain 28.4 g (yield 60.5%) of the aimed compound as light yellow crystals. As a result of HPLC analysis, the purity was found to be 96.3%.

Provenance & Evidence