Hydrochloric Acid → 2-Amino-5-[1-[4-(piperidin-4-yloxy)-quinolin-6-yl]-meth-(z)-ylidene]-thiazol-4-one

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The suspension of 4-{6-[2-amino-4-oxo-4H-thiazol-(5Z)-ylidenemethyl]-quinolin-4-yloxy}-piperidine-1-carboxylic acid tert-butyl ester (70 mg, 0.15 mmol) in dichloromethane (1 ml) was treated with hydrogen chloride (in 1,4-dioxane, 4M, 1 ml) for 1.5 hr at room temperature. After removing the solvent, the obtained solid was treated with either. Ion exchange extraction chromatography (Cation exchanger: benenesulfonic acid, 2 g/6 ml, 1M ammonia in methanol and dichloromethane) afforded the free base form of 2-Amino-5-[1-[4-(piperidin-4-yloxy)-quinolin-6-yl]-meth-(Z)-ylidene]-thiazol-4-one. LC-MS m/e 355 (MH+).

Provenance & Evidence