Reaction Steps
Following the procedure as described in EXAMPLE 5.30 and making non-critical variations using 2,3-dihydrospiro[furo[2,3-f][1,4]-benzodioxine-7,3′-indol]-2′(1′H)-one to replace 2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one, and 2-(bromomethyl)pyridine hydrobromide to replace ethyl 2-(bromomethyl)nicotinate, (pyridin-2-ylmethyl)-2,3-dihydrospiro[furo[2,3-f][1,4]benzodioxine-7,3′-indol]-2′(1′H)-one was obtained (57%) as a colorless solid: mp 205-206° C.; 1H NMR (300 MHz, DMSO-d6) δ8.52 (d, 1H, J=4.7 Hz), 7.79 (ddd, J=7.7, 7.7, 1.7 Hz, 1H), 7.35-7.20 (m, 4H), 7.02 (dd, J=7.5, 7.5 Hz, 1H), 6.93 (d, J=7.7 Hz, 1H), 6.29 (ABq, 2H), 5.04 (ABq, 2H), 4.84 (ABq, 2H), 4.27 (s, 4H); 13C NMR (75 MHz, DMSO-d6) δ176.7, 155.2, 149.2, 148.8, 144.6, 142.5, 137.0, 131.6, 129.2, 128.6, 123.6, 122.9, 122.6, 122.4, 121.4, 114.4, 109.8, 109.2, 80.2, 64.1, 63.9, 57.3, 44.8; MS (ES+) m/z 387.7 (M+1).
