Benzylamine → N-Benzyl-2-imino-4-methyl-2,3-dihydro-1,3-thiazole-5-carboximidic acid

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To a suspension of 2-amino-4-methylthiazole-5-carboxylic acid (5.20 g, 32.90 mmol) and di-iso-propylethylamine (15.00 mL, 86.70 mmol) in N,N-dimethylformamide (40 mL) was added N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (8.18 g, 42.70 mmol). The resulting mixture was stirred for 30 min, then 1-hydroxybenzotriazole hydrate (5.78 g, 42.70 mmol) was added, and followed by the addition of benzylamine (4.30 mL, 39.30 mmol). The reaction mixture was stirred at ambient temperature for 2 days, then diluted with ethyl acetate, washed with water and brine, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo. The residue was purified by column chromatography to afford the title compound in 60% yield (4.90 g); 1H NMR (DMSO-d6, 300 MHz) δ 7.36-7.25 (m, 5H), 5.79 (s, br, 1H), 5.36 (s, br, 2H), 4.54 (dd, J=5.7 Hz, 2H), 2.47 (s, 3H). MS (ES+) m/z 248.4 (M+1).

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