Triethylamine → HCID 59352085, compound

Participants

Reaction Steps

A mixture of 5-[(2′-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3-indol]-1′(2′H)-yl)methyl]furan-2-carboxylic acid (4.85 g, 12 mmol), thionyl chloride (11.90 g, 100 mmol) and a few drops of N,N-dimethylformamide in chloroform (60 mL) was stirred at ambient temperature for 16 h. The solvent and excess of thionyl chloride were evaporated under reduced pressure. The residue was dissolved in dichloromethane (50 mL). To the above solution (5 mL, 1.2 mmol) was added dimethylamine hydrochloride (0.81 g, 10 mmol), and triethylamine (1.01 g, 10 mmol). The mixture was stirred at ambient temperature for 3 h. The reaction mixture was diluted with dichloromethane (100 mL) and extracted with water (2×100 mL), dried over magnesium sulfate and filtered. The filtrate was evaporated under reduced pressure, and the residue was purified by column chromatography with dichloromethane-methanol (100:1-20:1) to afford N,N-dimethyl-5-[(2′-oxo-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-1′(2′H)-yl)methyl]furan-2-carboxamide (0.22 g, 42%) as a colorless solid: 1H NMR (300 MHz, CDCl3) δ7.31-6.90 (m, 5H), 6.43-6.37 (m, 3H), 4.97 (ABq, 2H), 4.78 (ABq, 2H), 4.52 (t, J=8.6 Hz, 2H), 3.11 (s, 6H), 2.96 (t, J=8.6 Hz, 2H); 13C NMR (75 MHz, CDCl3) δ177.2, 161.6, 161.0, 159.4, 151.3, 147.5, 142.2, 132.6, 129.1, 124.1, 123.7, 121.0, 120.4, 119.5, 116.8, 110.4, 109.8, 92.9, 80.1, 72.6, 57.4, 37.1, 28.8; MS (ES+) m/z 431.1 (M+1).

Provenance & Evidence