Enprofylline → 8-Chloro-3-propyl-3,7-dihydro-1H-purine-2,6-dione

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3-Propyl-3,7-dihydro-1H-purine-2,6-dione (J. Med. Chem, 1993, 36 (10), 1380-6) (0.3 g, 1.5 mmol) and N-chlorosuccinimide (0.21 g, 1.5 mmol) were dissolved in DMF (5 ml) and the solution stirred for 5 h. The solution was concentrated and the solid residues washed with methanol and filtered to provide the product as a white solid (0.148 g, 42%). NMR; δH (400 MHz, d6-DMSO) 0.85 (t, 3H, J=7 Hz), 1.65 (m, 2H), 3.8 (t, 2H, J=7 Hz), 11.2 (s, 1H), one exchangeable not observed to δH 13; m/z 229[MH+]

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