Hydrochloric Acid → 3-[2-Fluoro-5-(4-oxo-3,4,5,6,7,8-hexahydro-phthalazin-1-ylmethyl)-phenyl]-5-methylimidazolidine-2,4-dione

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Reaction Steps

To a solution of 2-{3-[2-fluoro-5-(4-oxo-3,4,5,6,7,8-hexahydro-phthalazin-1-ylmethyl)-phenyl]-ureido}-propionic acid methyl ester (12) (0.425 g, 1.053 mmol), in dry DMA (5 ml), was added ground sodium hydroxide (0.433 mg, 1.053 mmol) in one portion. The reaction mixture was then placed in a preheated oil bath at 50° C. for 10 minutes and neutralised by addition of HCl (2N, ca 1 ml). The mixture was then concentrated to dryness and subjected to flash chromatography, eluent neat ethyl acetate (Rf=0.15). Single peak in LC-MS, (0.457 g, 99% purity); 1H NMR (300 MHz, D6 DMSδ ppm 12.61 (s, 1H), 8.51 (s, 1H), 7.40-7.15 (m, 3H), 4.32 (m, 1H), 3.93 (s, 2H), 2.46 (m, 4H), 1.63 (s, 4H), 1.35 (d, J=6.94 Hz, 3H). M/z (LC-MS, ESP), RT=3.28 mins (M+H 371.1).

Provenance & Evidence