Potassium Iodide → ethyl 2-[(2'-oxo-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3'-indol]-1'(2'H)-yl)methyl]pyridine-3-carboxylate

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A 50 mL round-bottom flask was charged with 2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one (2.0 g, 6.8 mmol), ethyl 2-(bromomethyl)nicotinate (2.3 g, 9.4 mmol), cesium carbonate (6.62 g, 20.3 mmol), potassium iodide (0.17 g, 1.0 mmol) and N,N-dimethylformamide (30 mL). The reaction mixture was stirred under nitrogen at 95° C. for 1 h, allowed to cool to ambient temperature and concentrated in vacuo. Purification of the residue by column chromatography and eluted with a 0% to 30% gradient of ethyl acetate in dichloromethane afforded ethyl 2-[(2′-oxo-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-1′(2′H)-yl)methyl]pyridine-3-carboxylate (2.4 g, 79%) as an off-white solid: MS (ES+) m/z 459.0 (M+1).

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