Hydrochloric Acid → tert-Butyl (E)-3-{2-(3-hydroxypiperidino)-8-[(E)-2-(4-isopropyl-1,3-thiazol-2-yl)-1-ethenyl]-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl}-2-propenoate

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Reaction Steps

The tert-butyl (E)-3-{2-(3-formyloxypiperidino)-8-[(E)-2-(4-isopropyl-1,3-thiazol-2-yl)-1-ethenyl]-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl}-2-propenoate (184 mg, 0.334 mmol) obtained in (G) was dissolved in methanol (3.0 ml), added with 1 N aqueous sodium hydroxide (1.0 ml), and then the mixture was stirred at room temperature for 10 minutes. The reaction mixture was added with 1 N hydrochloric acid (1.0 ml) and extracted with chloroform. The organic layer was dried over magnesium sulfate and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=2:1→2:1→1:2, v/v) to obtain the title compound (174 mg, 100%).

Provenance & Evidence