Triethylamine → 3-chloro-N-[3-(2'-oxospiro[furo[2,3-f][1,3]benzodioxole-7,3'-indol]-1'(2'H)-yl)propyl]thiophene-2-carboxamide

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To a solution of 1′-(3-aminopropyl)spiro[furo[2,3-f][1,3]benzodioxole-7,3′-indol]-2′(1′H)-one (0.05 g, 0.13 mmol) in dichloromethane (4.00 mL) was added triethylamine (0.03 g, 0.26 mmol) and 3-chlorothiophene-2-carbonyl chloride (0.02 g, 0.12 mmol) at 0° C. The mixture was stirred for 2 h, washed with 15% HCl solution and water. The organic layer was dried over MgSO4 and filtered. The filtrate was concentrated in vacuo to dryness. The residue was dissolved in ethyl acetate, and the product was precipitated with the addition of hexane. The white solid was collected by filtration and dried in vacuo to yield the title compound (0.04 g) in 67% yield: 1H NMR (300 MHz, CDCl3) δ 7.60 (t, 1H), 7.41 (d, 1H), 7.33-7.27-(m, 1H), 7.17 (d, 1H), 7.08-7.03-(m, 1H), 6.93 (t, 1H), 6.49 (s, 1H), 6.11 (s, 1H), 5.95 (m, 2H), 4.90 (d, 1H), 4.65 (d, 1H), 3.96-3.79-(m, 2H), 3.53-3.36-(m, 2H), 2.04-1.93-(m, 2H); 13C NMR (75 MHz, CDCl3) δ 178.3, 160.6, 156.0, 149.0, 142.4, 141.8, 132.5, 129.4, 129.2, 129.1, 124.2, 123.7, 123.6, 119.2, 108.5, 102.9, 101.6, 93.7, 80.5, 58.3, 37.4, 36.5, 27.3; MS (ES+) m/z 483 (M+1).

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