反应详情

Following the procedure as described in Example 17 and making non-critical variations using 1′-[4-(benzyloxy)benzyl]-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one to replace 1′-[4-(benzyloxy)benzyl]-5,6-dihydrospiro[benzo[1,2-b:5,4-b′]difuran-3,3′-indol]-2′(1′H)-one, 1′-(4-hydroxybenzyl)-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one was obtained (93%) as a colorless solid: mp 243-244° C.; 1H NMR (300 MHz, CDCl3) δ 9.42 (s, 1H), 7.30-7.22 (m, 1H), 7.20-7.13 (m, 3H), 7.05-6.97 (m, 2H), 6.76-6.68 (m, 2H), 6.52 (s, 1H), 6.04 (s, 1H), 4.89-4.63 (m, 4H), 4.21-4.07 (m, 4H); 13C NMR (75 MHz, CDCl3) δ 176.6, 156.7, 154.6, 144.1, 142.1, 137.7, 131.7, 128.6, 126.4, 123.5, 122.9, 121.2, 115.3, 110.8, 109.5, 98.8, 79.3, 64.1, 63.5, 57.1, 42.5; MS (ES+) m/z 401.9 (M+1).