Lithium Hydroxide → (E)-3-{8-[2-(4-Isopropyl-1,3-thiazol-2-yl)ethyl]-4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl}-2-propenoic acid

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Reaction Steps

The ethyl (E)-3-{8-[2-(4-Isopropyl-1,3-thiazol-2-yl)ethyl]-4-oxo-4H-pyrido-[1,2-a]pyrimidin-3-yl}-2-propenoate (15 mg) obtained in (A) was dissolved in tetrahydrofuran (1 ml) and methanol (0.5 ml), added with a solution of 8 mg of lithium hydroxide dissolved in 0.5 ml of water, and stirred at room temperature for 3.5 hours, and the solvent was concentrated under reduced pressure. The residue was distributed between ether and water, and the aqueous layer was separated, made pH 3 with hydrochloric acid, extracted with ethyl acetate, and dried over sodium sulfate. After the solvent was evaporated, the residue was purified by silica gel column chromatography to obtain the title compound.

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