Ammonia → HCID 178479305, compound

Participants

Reaction Steps

To an argon purged vial fitted with a magnetic stirbar was charged a solution of 180 (28 mg, 0.108 mmol) in absolute ethanol (3 mL). Methyl thiophene-2-carbimidothioate hydroiodide (62 mg, 0.217 mmol) was added as a yellow solid in one portion. The reaction was stirred at room temperature for 17 hours. The reaction was complete by TLC (10% 2M ammonia in methanol, 90% dichloromethane). The reaction was diluted with ether (15 mL) and the solid which precipitated was collected by vacuum filtration. The precipitate was washed with ether (10 mL). The product was collected by washing the filter with methanol (10 mL) and collecting the filtrate. The filtrate was returned to the reaction vial and DOWEX-66 (3 g) was added. The reaction was stirred for 2 hours. The reaction was filtered and the filtrate concentrated to afford a brown solid. The solid was taken up in dichloromethane (10 mL) and partitioned with saturated sodium bicarbonate (2 mL). The organic phase was treated with brine, dried over magnesium sulfate and filtered. The filtrate was treated with 1M hydrogen chloride in ether (3 mL). After stifling for 1 hours the reaction was concentrated on the rotary evaporator. The resulting yellow solid was dried further on the high vacuum line. Yield: 45 mg of yellow solid, compound 181 (96%). 1H NMR (DMSO) δ 10.91 (br s, 1H), 7.96 (s, 2H), 7.42-7.39 (d, J=8.4 Hz, 2H), 7.36 (s, 1H), 7.29-7.25 (t, J=4.5 Hz, 1H), 7.24 (s, 1H), 6.92-6.89 (d, J=8.7 Hz, 1H), 3.58 (s, 4H), 2.72-2.67 (t, J=7.5 Hz, 2H), 2.38 (m, 6H), 1.83-1.78 (m, 2H). MS (ESI+): 369 (MH+, 100%).

Provenance & Evidence