Trifluoroacetic acid → 3-(2-Amino-5-(thiophen-2-yl)phenyl)-1,1-dimethylurea

関与物質

反応手順

To a solution of tert-butyl (2-(3,3-dimethylureido)-4-(thiophen-2-yl)phenyl)carbamate (115 mg, 0.32 mmol) in dichloromethane (5 mL) was added TFA (2 mL) at 0° C. The reaction was warmed to room temperature and stirred for 1 h. The reaction was concentrated. The crude residue was diluted with ethyl acetate (30 mL) and washed with a saturated aqueous solution of sodium bicarbonate, then water (20 mL), dried over sodium sulfate, filtered and concentrated. The obtained residue was washed with hexane (2 mL) to afford 3-(2-amino-5-(thiophen-2-yl)phenyl)-1,1-dimethylurea (65 mg, 83% yield). ESI+ MS: m/z 262 ([M]+). 1H NMR (500 MHz, d6-DMSO): δ7.68 (s, 1H), 7.34 (d, J=5.0, 1H), 7.29 (d, J=2.0, 1H), 7.19 (dd, J=4.5, 2.0, 2H), 7.04 (m, 1H), 6.73 (d, J=8.5, 1H), 5.00 (s, 2H), 2.93 (s, 6H).

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