[C:1]([NH2:4])(=[S:3])[CH3:2].C([O-])([O-])=O.[K+].[K+].[C:11](Cl)(=[O:21])[C:12]1[C:13](=[CH:17][CH:18]=[CH:19][CH:20]=1)[C:14](Cl)=[O:15]>C1COCC1>[C:1]([N:4]1[C:14](=[O:15])[C:13]2[C:12](=[CH:20][CH:19]=[CH:18][CH:17]=2)[C:11]1=[O:21])(=[S:3])[CH3:2]To a mixture of thioacetamide (10.04 g, 133.64 mmol) and K2CO3 (45.80 g, 331.38 mmol) in 100 ml THF at 0° C. add phthaloyl chloride (28.49 g, 140.32 mmol) dropwise. Raise the reaction temperature to 25° C. after 2 hours and allow it to stir for an additional 2 hours before cooling the reaction mixture to 0° C. again. Quench the reaction by adding 125 mL of ice water dropwise. Extract the reaction mixture with EtOAc (2×). Dry the organic layer with MgSO4 and remove the solvent in vacuo to yield 3.7 g of N-thioacetyl-isoindole-1,3-dione as a crude reddish solid.
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