Reaction Steps
Following the procedure as described in EXAMPLE 32 and making non-critical variations using dimethylamine (40% w/w in water) to replace morpholine and 1′-[(6-chloropyridin-2-yl)methyl]-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one to replace 1′-[(6-chloropyridin-3-yl)methyl]-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one, 1′-{[6-(dimethylamino)pyridin-2-yl]methyl}-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one was obtained (44%) as a colorless solid: mp 196-197° C.; 1H NMR (300 MHz, CDCl3) δ7.45-7.34 (m, 1H), 7.24-7.11 (m, 2H), 7.06-6.94 (m, 2H), 6.52-6.46 (m, 2H), 6.42-6.35 (m, 1H), 6.28 (s, 1H), 4.91 (ABq, J=53.2, 15.3 Hz, 2H), 4.80 (ABq, J=84.8, 9.1 Hz, 2H), 4.23-4.07 (m, 4H), 3.04 (s, 6H); 13C NMR (300 MHz, CDCl3) δ 177.4, 159.0, 155.3, 153.3, 144.5, 142.7, 138.2, 137.9, 132.2, 128.6, 123.5, 123.1, 121.2, 111.7, 109.9, 108.8, 104.5, 99.3, 80.3, 64.5, 63.9, 58.1, 46.0, 37.8; MS (ES+) m/z 430.0 (M+1).
