Reaction Steps
A 50 mL round bottom flask was charged with 9-fluoro-2,3-dihydro-spiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one (0.63 g, 2.0 mmol), 2-(bromomethyl)pyridine hydrobromide (0.51 g, 2.0 mmol), cesium carbonate (3.26 g, 10.0 mmol) and N,N-dimethylformamide (20 mL). The reaction mixture was heated at 90° C. for 1 h, allowed to cool to ambient temperature, filtered and the filtrate concentrated in vacuo. Purification of the residue by column chromatography and eluted with a 0% to 70% gradient of ethyl acetate in dichloromethane afforded 9-fluoro-1′-(pyridin-2-ylmethyl)-2,3-dihydro-spiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one (0.46 g, 57%) as an off-white solid: 1H NMR (300 MHz, DMSO-d6) δ 8.45 (d, J=4.3 Hz, 1H), 7.71-7.77 (m, 1H), 7.40-6.87 (m, 6H), 6.19 (d, J=1.8 Hz, 1H), 5.02 (ABq, 2H), 4.84 (ABq, 2H), 4.27-4.09 (m, 4H); 13C NMR (75 MHz, DMSO-d6) δ 176.7, 155.6, 149.6, 143.1, 142.1, 142.0, 139.2, 139.2, 138.5, 137.5, 135.3, 133.9, 133.7, 131.5, 129.3, 124.1, 123.4, 123.2, 122.7, 122.7, 122.1, 109.9, 106.6, 106.6, 80.8, 64.7, 64.1, 58.0, 58.0, 45.2; MS (ES+) m/z 404.8 (M+1).
