Reaction Steps
Following the procedure as described in EXAMPLE 4 and making non-critical variations using 2-(chloromethyl)-4-fluoropyridine hydrochloride to replace 2-(bromomethyl)tetrahydro-2H-pyran, and 2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one to replace 5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2″(1′H)-one, 1′-[(4-fluoropyridin-2-yl)methyl]-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one was obtained (54%) as a colorless solid: mp 228-231° C. (diethyl ether); 1H NMR (300 MHz, CDCl3) 8.52 (dd, J=8.38, 5.56 Hz, 1H), 7.24-7.14 (m, 2H), 7.06-6.90 (m, 3H), 6.85 (d, J=7.8 Hz, 1H), 6.49 (s, 1H), 6.30 (s, 1H), 5.15 (d, J=16.0 Hz, 1H), 5.02-4.91 (m, 2H), 4.67 (d, J=8.9 Hz, 1H), 4.21-4.07 (m, 4H); 13C NMR (75 MHz, CDCl3) δ 177.6, 171.0, 167.6, 158.9 (2), 155.3, 152.0 (2), 144.7, 141.9, 138.4, 132.2, 128.9, 124.0, 123.7, 120.9, 111.7, 111.0, 110.8, 109.7, 109.5, 109.3, 99.4, 80.1, 64.5, 63.9, 58.1, 45.8, 11.9; MS (ES+) m/z 404.9 (M+1).
