C[O:2][C:3]([C:5]1[N:6]([NH:10][C:11](=[O:21])[CH2:12][O:13][CH2:14][C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)[CH:7]=[N:8][CH:9]=1)=O.[OH-].[NH4+:23]>>[CH2:14]([O:13][CH2:12][C:11]([NH:10][N:6]1[C:5]([C:3]([NH2:23])=[O:2])=[CH:9][N:8]=[CH:7]1)=[O:21])[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1Compound 2 (8.7 g, 30.1 mmol) and ammonium hydroxide (15 ml) were combined in a sealed tube and heated to 70° C. under microwave irradiation for 2 hours. The mixture was concentrated in vacuo to afford compound 3 (7.3 g, 88% yield) as a white solid. LC-MS: m/z 275.1 [M+H]+.
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