Pipemidic Acid → 8-Ethyl-2-(4-((2-methoxyphenyl)carbamothioyl)piperazin-1-yl)-5-oxo-5,8-dihydropyrido[2,3-d]pyrimidine-6-carboxylic acid

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Pipemidic acid (53 mg, 0.175 mmol) and 2-methoxyphenyl isothiocyanate (20 μL, 0.145 mmol) were used. Purification on silica yielded compound 21 in Table 1, below (36 mg, 53%). 1H NMR (250 MHz, CDCl3) δ 9.33 (s, 1H), 8.68 (s, 1H), 7.84 (d, J=7.30 Hz, 1H), 7.54 (s, 1H), 7.20-7.04 (m, 1H), 7.03-6.85 (m, 2H), 4.44-3.73 (m, 13H), 1.49 (t, J=6.60 Hz, 3H) ppm.

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