Pipemidic Acid → 2-(4-{[(4-Methylphenyl)amino]carbonothioyl}-1-piperazinyl)-8-ethyl-5-oxo-5,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylic Acid

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Pipemidic acid (89 mg, 0.293 mmol) and p-tolyl isothiocyanate (40 mg, 0.268 mmol) were used. Purification on silica yielded compound 27 in Table 1, below (82 mg, 68%). 1H NMR (300 MHz, CDCl3) δ 9.32 (s, 1H), 8.67 (s, 1H), 7.40 (s, 1H), 7.17 (d, J=7.60 Hz, 2H), 7.09 (d, J=7.44 Hz, 2H), 4.33 (q, J=6.40 Hz, 2H), 4.23-3.91 (m, 8H), 2.34 (s, 3H), 1.49 (t, J=7.03 Hz, 3H) ppm.

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