[Cl:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[NH:7][C:6](=[O:11])[C:5]2=[C:12]1[C:20]2[C:15](=[CH:16][C:17]([NH:21]C(C3C=CC=CC=3)(C3C=CC=CC=3)C3C=CC=CC=3)=[CH:18][CH:19]=2)[CH2:14][O:13]1.Cl.CO.CO>C1COCC1>[NH2:21][C:17]1[CH:16]=[C:15]2[C:20](=[CH:19][CH:18]=1)[C:12](=[C:5]1[C:4]3[C:8](=[CH:9][CH:10]=[C:2]([Cl:1])[CH:3]=3)[NH:7][C:6]1=[O:11])[O:13][CH2:14]2To a solution of 5-chloro-3-[5-(trityl-amino)-3H-isobenzofuran-1-ylidene]-1,3-dihydro-indol-2-one (200 mg, 0.37 mmol) in THF (4.0 ml) at room temperature was added 1.55M HCl/MeOH (0.5 ml). After stirring for 10 minutes, MeOH (3 ml) was added to the thick mixture, and then the resulting mixture was stirred for another 30 minutes. The precipitant was filtered, and rinsed with MEOH, CHCl3, MeOH and then 30% EtOAc in hexane to give 3-(5-amino-3H-isobenzofuran-1-ylidene)-5-chloro-1,3-dihydro-indol-2-one as a bright yellow solid (79 mg, 72%).
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