Cl[C:2]1[CH:7]=[CH:6][N:5]=[C:4]2[CH:8]=[C:9]([C:11]3[N:12]=[CH:13][N:14]([CH3:16])[CH:15]=3)[S:10][C:3]=12.Cl.[CH3:18][NH2:19].[OH-].[Na+]>C(O)(C)C.O>[CH3:18][NH:19][C:2]1[CH:7]=[CH:6][N:5]=[C:4]2[CH:8]=[C:9]([C:11]3[N:12]=[CH:13][N:14]([CH3:16])[CH:15]=3)[S:10][C:3]=12A stirred suspension of 10 (500 mg, 2 mmol) and methylamine hydrochloride (15 g, 222 mmol) in isopropanol (50 ml) was heated at 130° C. in a sealed flask for four days, then cooled to room temperature. The reaction mixture was poured in water, and the pH was adjusted to ˜10 with 1N NaOH. After extraction of the aqueous phase with AcOEt, the combined organic layer was concentrated and directly purified by flash column chromatography (eluents 2% of NH4OH in methanol/CH2Cl2: 10/90 to 40/60) to afford title compound 344 (487 mg, 99% yield, hydrate form) as a beige solid. MS (m/z): 245.0 (M+H)+−.
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