Reaction Steps
Following the procedure as described in EXAMPLE 4 and making non-critical variations using 5-chloromethyl-2-(trifluoromethyl)pyridine 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′-{[6-(trifluoromethyl)pyridin-3-yl]methyl}-2,3-dihydrospiro[furo[2,3-g][1,4]-benzodioxine-8,3′-indol]-2′(1′H)-one was obtained (90%) as a colorless solid: mp 204-207° C. (dichloromethane); 1H NMR (300 MHz, CDCl3) δ 8.74 (d, J=1.6 Hz, 1H), 7.82 (dd, J=8.1, 1.6 Hz, 1H), 7.66 (d, J=8.1 Hz, 1H), 7.27-7.15 (m, 1H), 7.03-7.05 (m, 1H), 6.75 (d, J=7.8 Hz, 1H), 6.50 (s, 1H), 6.18 (s, 1H), 5.11 (d, J=16.0 Hz, 1H), 4.92 (d, J=16.1 Hz, 1H), 4.91 (d, J=9.0 Hz, 1H), 4.64 (d, J=9.0 Hz, 1H), 4.22-4.07 (m, 1H); 13C NMR (75 MHz, CDCl3) δ 177.7, 155.3, 149.0, 147.9 (q, J=139.5 Hz), 144.8, 141.2, 138.4, 136.5, 134.9, 132.1, 129.1, 124.4, 124.1, 121.4, 120.8 (q, J=10.8 Hz), 120.5, 111.4, 108.6, 99.6, 80.1, 64.5, 63.9, 58.0, 41.3; MS (ES+) m/z 429.9 (M+1).
