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General procedure: To a mixture of chloroisatin (1.0 mmol), 3-(4-oxo-2-thioxothiazolidin-3-yl)propanoic acid (205 mg, 1.0 mmol) and NaOAc (820 mg, 10.0 mmol) was added acetic acid (5.0 mL). The reaction was allowed to stir at 105 °C for 30 min - 12 h, then cooled to room temperature. To the reaction was added water (15 mL). The resulting mixture was sonicated to give an orange -red slurry. After filtration, the solid was washed with water (75 mL) and dried under high vacuum to yield the corresponding product as a red fine powder (71-92percent):
General procedure: To a mixture of chloroisatin (1.0 mmol), <strong>[7025-19-6]3-(4-oxo-2-thioxothiazolidin-3-yl)propanoic acid</strong> (205 mg, 1.0 mmol) and NaOAc (820 mg, 10.0 mmol) was added acetic acid (5.0 mL). The reaction was allowed to stir at 105 C for 30 min - 12 h, then cooled to room temperature. To the reaction was added water (15 mL). The resulting mixture was sonicated to give an orange -red slurry. After filtration, the solid was washed with water (75 mL) and dried under high vacuum to yield the corresponding product as a red fine powder (71-92%):
In dimethylsulfoxide-d6; at 20℃;
General procedure: To a mixture of 5-chloroisatin (182 mg, 1.0 mmol) and N-carboxyethylrhodanine (205 mg, 1.0 mmol) was added DMSO-d6 (3.0 mL). The reaction was followed by proton NMR until the disappearance of the starting material.
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