Ammonia → HCID 178480323, compound

Participants

Reaction Steps

To an argon purged round bottom flask was charged 146 (40 mg, 0.164 mmol) and thiophene-2-carboximidothioic acid methyl ester hydroiodide (94 mg, 0.329 mmol) followed by absolute ethanol (3 mL). The reaction was stirred using a magnetic stirbar for 60 hours at room temperature. TLC (10% 2 M ammonia in methanol/90% dichloromethane) revealed all starting amine had reacted. The reaction as treated with ether (50 mL). The resulting yellow precipitate was collected by vacuum filtration and washed with ether. The precipitate was washed from the filter using methanol. The residue was concentrated, and purified by silica gel column chromatography (5-10% 2M ammonia in methanol/95-90% dichloromethane) to afford a yellow oil. The purified product was dissolved in anhydrous methanol (3 mL) and treated with 1M hydrogen chloride in ether (5 mL). After stifling for 30 minutes the precipitate was collected by vacuum filtration. The precipitate was washed with ether, followed by washing from the filter with methanol. The filtrate was concentrated and dried under high vacuum. Yield: 21 mg of yellow solid, compound 147 (30%) Melting point 212° C. 1H NMR (MeOD-d3) δ 8.09 (br s, 2H), 7.76 (s, 1H), 7.59 (d, 1H, J=8.7 Hz), 7.41 (br s, 1H), 7.35 (s, 1H), 7.19 (d, 1H, J=8.7 Hz), 3.67 (br m, 1H), 3.19 (br m, 1H), 3.1-2.8 (br m, 2H), 2.91 (s, 3H), 2.46 (br m, 2H), 2.2-1.8 (br m, 5H). MS (TOF+): Exact calc. for C20H25N4S 353.1794 (MH+). found 353.1782.

Provenance & Evidence