COC[O:4][C:5]1[C:13]([CH3:14])=[CH:12][C:11]([I:15])=[C:10]2[C:6]=1[CH:7](O)[N:8](C(C)(C1C=CC=CC=1)C)[C:9]2=[O:16].FC(F)(F)C(O)=O.C([SiH](CC)CC)C.C(=O)([O-])O.[Na+]>[N+](C)([O-])=O.C(OCC)(=O)C>[OH:4][C:5]1[C:13]([CH3:14])=[CH:12][C:11]([I:15])=[C:10]2[C:6]=1[CH2:7][NH:8][C:9]2=[O:16]In a similar manner to Step. 4 of Example 16, 4-methoxymethoxy-5-methyl-3-hydroxy-7-iodo-2-(1-methyl-1-phenylethyl)isoindolinone (500 mg, 1.07 mmol) was dissolved in nitromethane (20 mL), and the solution was treated with trifluoroacetic acid (0.742 mL, 9.63 mmol) and triethylsilane (1.54 mL, 9.64 mmol). The reaction mixture was added with saturated aqueous sodium hydrogencarbonate solution and ethyl acetate. The precipitated solid was collected by filtration and washed with water, followed by drying under reduced pressure to obtain 4-hydroxy-5-methyl-7-iodoisoindolinone (161 mg, yield 52%).
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