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

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To a solution of (S)-ethyl 2-(3-(4-fluorobenzyl)-4-methyl-2-oxoimidazolidin-1-yl)-4-methylthiazole-5-carboxylate (0.50 g, 1.32 mmol) in tetrahydrofuran (20.0 mL) was added a solution of lithium hydroxide (0.16 g, 6.62 mmol) in water (15 mL). The reaction mixture was refluxed for 16 h and followed by the addition of 1 N aqueous hydrochloric acid solution to adjust pH to 2. The mixture was extracted with ethyl acetate (3×40 mL). The organic layer was washed with saturated aqueous sodium chloride solution (30 mL), dried over anhydrous sodium sulphate and filtered. The filtrate was concentrated in vacuo and the residue was purified by crystallized in ethyl acetate to afford the title compound as a colorless solid (0.32 g, 69%): mp 208-210° C. (ethyl acetate); 1H NMR (300 MHz, CDCl3) δ 7.31-7.26 (m, 2H), 7.04 (dd, J=8.6, 8.6 Hz, 2H), 4.83 (d, J=15.3 Hz, 1H), 4.29-4.14 (m, 2H), 3.78-3.65 (m, 2H), 2.65 (s, 3H), 1.31 (d, J=5.9 Hz, 3H); MS (ES−) m/z 347.9 (M−1).

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