Hydrochloric Acid → 1H-Isoindole-1,3(2H)-dione, 2-(4-chloro-2-fluoro-5-hydroxyphenyl)-4,5,6,7-tetrahydro-

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Potassium carbonate (4.6 g, 33.3 mmol) was added to a solution of N-(2-fluoro-4-chloro-5-methoxycarbonyloxyphenyl)-3,4,5,6-tetrahydrophthalimide (11.8 g, 33.4 mmol) obtained as described above in methanol (100 ml), followed by stirring for 5 hours under refluxing. After completion of the reaction, the mixture was poured into 1N hydrochloric acid (200 ml), and the mixture was extracted with ethyl acetate (100 ml×3 times). The organic layer was washed with water, dried, and the solvent was distilled off under reduced pressure to obtain a crude product (9.4 g). The product was recrystallized from ether/hexane to obtain N-(2-fluoro-4-chloro-5-hydroxypheyl)-3,4,5,6-tetrahydrophthalimide as a white solid (6.7 g, 22.7 mmol, 67.8.% yield).

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