Hydrochloric Acid → 2-(3-((2,2-Difluorocyclopropyl)methyl)-2-oxoimidazolidin-1-yl)-4-methylthiazole-5-carboxylic acid

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To a solution of ethyl 2-(3-((2,2-difluorocyclopropyl)methyl)-2-oxoimidazolidin-1-yl)-4-methylthiazole-5-carboxylate (0.77 g, 2.24 mmol) in tetrahydrofuran (40.0 mL) was added lithium hydroxide monohydrate (0.27 g, 11.2 mmol) in water (2.0 mL). The reaction mixture was heated at reflux for 16 h, cooled to an ambient temperature, then acidified with a solution of hydrochloric acid (3.0 N, 10.0 mL). The solvent was removed in vacuo to dryness and the precipitate was filtered, dried to afford the title compound as a colourless solid (0.49 g, 68%): mp 210-215° C.; 1H NMR (300 MHz, DMSO-d6) δ 12.79 (br, 1H), 3.99 (t, J=9.0 Hz, 2H), 3.64-3.48 (m, 3H), 3.19-3.12 (m, 1H), 2.46 (s, 3H), 2.02-1.88 (m, 1H), 1.67-1.55 (m, 1H), 1.37-1.26 (m, 1H); 13C NMR (75 MHz, DMSO-d6) δ 164.0, 159.8, 156.0, 155.2, 115.2, 114.9 (t), 42.4, 42.1, 41.1 (d), 20.3 (t, 2JC-F=43 Hz), 17.4, 14.9 (t, 2JC-F=43 Hz); MS (ES+) m/z 318.0 (M+1).

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