[S:1]1[CH:5]=[CH:4][N:3]=[C:2]1[NH:6][S:7]([C:10]1[C:19]2[C:14](=[C:15]([NH:20]C=O)[CH:16]=[CH:17][CH:18]=2)[CH:13]=[CH:12][CH:11]=1)(=[O:9])=[O:8].[OH-].[K+].CCO.CC(O)=O>O>[S:1]1[CH:5]=[CH:4][N:3]=[C:2]1[NH:6][S:7]([C:10]1[C:19]2[C:14](=[C:15]([NH2:20])[CH:16]=[CH:17][CH:18]=2)[CH:13]=[CH:12][CH:11]=1)(=[O:9])=[O:8]A solution of 5-formylamino-naphthalene-1-sulfonic acid thiazol-2-ylamide (350.0 mg, 1.0 mmol), KOH (168.0 mg, 3.0 mmol), EtOH (1.0 ml) and H2O (0.5 ml) was heated at 60° C. for 6 h. The mixtures was then cooled to 0° C., and neutralized with AcOH (3.0 mmol). The formed precipitate was filtered and dried under vacuum to give 5-amino-naphthalene-1-sulfonic acid thiazol-2-ylamide as a light tan solid (280 mg, 92%). 1H NMR (400 MHz, DMSO-d6) δ 8.31 (d, J=8.5 Hz, 1H), 8.11 (dd, J=7.2, 1.0 Hz, 1H), 7.87 (d, J=8.5 Hz, 1H), 7.45-7.42 (m, 1H), 7.32-7.28 (m, 1H), 7.19 (d, J=4.6 Hz, 1H), 6.77-6.73 (m, 2H), 5.90 (s, 2H). LC/MS (10-99% CH3CN), M/Z: M+1 obs=306.10; tR=1.12 min.
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