Reaction Steps
Following the procedure as described in EXAMPLE 2 and making non-critical variations using 8-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-6-[2-(2-methoxyethoxy)ethyl]-2,3,6,8-tetrahydro-7H-[1,4]dioxino[2,3-f]indol-7-one to replace 1-(diphenylmethyl)-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one, 6-[2-(2-methoxyethoxy)ethyl]-2,2′,3,3′-tetrahydrospiro[1,4-dioxino[2,3-f]indole-8,8′-furo[2,3-g][1,4]benzodioxin]-7(6H)-one was obtained (74%): mp 146-148° C.; 1H NMR (300 MHz, CDCl3) δ6.64 (s, 1H), 6.56 (s, 1H), 6.43 (s, 1H), 6.22 (s, 1H), 4.67 (ABq, 2H), 4.27-4.03 (m, 8H), 3.98-3.65 (m, 4H), 3.65-3.55 (m, 2H), 3.52-3.45 (m, 2H), 3.34 (s, 3H); 13C NMR (75 MHz, CDCl3) δ177.6, 155.0, 144.4, 143.8, 139.6, 138.2, 136.4, 124.7, 121.4, 113.3, 111.5, 99.3, 99.2, 80.1, 71.9, 70.4, 68.1, 64.6, 64.5, 64.1, 63.9, 59.0, 57.8, 40.3; MS (ES+) m/z 455.9 (M+1).
