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

To a suspension of 2-amino-4-methylthiazole-5-carboxylic acid (5.20 g, 32.9 mmol) and N,N-diisopropylethylamine (15 mL, 86.70 mmol) in N,N-dimethylformamide (40 mL) was added N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide hydrochloride (8.18 g, 42.7 mmol). The resulting mixture was stirred for 30 min, then 1-hydroxybenzotriazole hydrate (5.78 g, 42.7 mmol) was added, followed by the addition of benzylamine (4.3 mL, 39.3 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 (300 MHz, DMSO-d6) δ 7.36-7.25 (m, 5H), 5.79 (br s, 1H), 5.36 (br s, 2H), 4.54 (d, J=5.7 Hz, 2H), 2.47 (s, 3H); MS (ES+) m/z 248.4 (M+1).

1. stirringThe reaction mixture was stirred at ambient temperature for 2 days
2. washwashed with water and brine
3. dry with materialdried over anhydrous sodium sulfate
4. filtrationfiltered
5. concentrationThe filtrate was concentrated in vacuo
6. customThe residue was purified by column chromatography

ORD record

ord-e966a3c94a7645129fb3ce9693f90744

Source dataset

uspto-grants-2012_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08293768B2