Hydrochloric Acid → 4-oxo-10-(3-cyclopentylpropionamido)-4H-pyrimido[1,2-C]quinazoline-3-carboxylic acid

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A mixture of methyl 4-oxo-10-(3-cyclopentylpropionamido)-4H-pyrimido[1,2-C]quinazoline-3-carboxylate (5.72 g) and anhydrous lithium iodide (14.3 g) in dry pyridine (59 ml) was stirred at 120° C. for 1.5 hours. The reaction mixture was concentrated under reduced pressure to give crystalline residue, which was suspended in water (100 ml). The suspension was adjusted to pH 1.7 with conc. hydrochloric acid to yield yellow crystals, which were separated by filtration, washed with water and dried. Recrystallization from N,N-dimethylformamide gave crystalline 4-oxo-10-(3-cyclopentylpropionamido)-4H-pyrimido[1,2-C]quinazoline-3-carboxylic acid (4.4 g).

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