Dichloromethane → HCID 178483702, compound

Participants

Reaction Steps

A solution of compound 92 (0.104 g, 0.512 mmol) in absolute ethanol (3 mL) was treated with methyl thiophene-2-carbimidothioate hydroiodide (0.290 g, 1.02 mmol) at room temperature and the resulting mixture was stirred for 3 hours. The reaction was diluted with saturated aqueous sodium bicarbonate (5 mL) followed by dichloromethane (30 mL) and transferred to a separatory funnel. The aqueous was extracted twice more with dichloromethane (2×30 mL). The combined organics were washed with brine and dried (Na2SO4). Solvent was evaporated and crude was purified by column chromatography (2M ammonia in methanol:dichloromethane, 5:95). Product was dried under high vacuum. HPLC revealed a 10% impurity. A second purification by column chromatography using less polar solvent conditions (2M ammonia in methanol:dichloromethane, 0:100-2.5:97.5) afforded pure product 93 (35 mg, 22%) as a yellow oil. 1H NMR (CDCl3) δ 7.43 (d, J=4.5 Hz, 2H), 7.33 (d, J=8.7 Hz, 1H), 7.21 (d, J=1.2 Hz, 1H), 7.13 (d, J=3.0 Hz, 1H), 7.08 (t, J=4.2 Hz, 1H), 6.67 (dd, J=1.8, 8.7 Hz, 1H), 6.43 (d, J=3.0 Hz, 1H), 4.22 (t, J=7.5 Hz, 2H), 2.72 (t, J=7.5 Hz, 2H), 2.31 (s, 6H); ES-MS (m/z, %): 313 (M+1); ESI-HRMS calculated for C17H21N4S (MH+): 313.1481, Observed: 313.1467.

Provenance & Evidence