Reaction Steps
Following the procedure as described in EXAMPLE 2 and making non-critical variations using 1-(diphenylmethyl)-4-fluoro-3-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-1,3-dihydro-2H-indol-2-one to replace 1-(diphenylmethyl)-3-(2-hydroxy-4-methoxy-5-methylphenyl)-1,3-dihydro-2H-indol-2-one, 1′-(diphenylmethyl)-4′-fluoro-2,3-dihydrospiro[furo[2,3-g][1,4]benzodioxine-8,3′-indol]-2′(1′H)-one was obtained (83%) as a colorless solid: mp 196-198° C.; 1H NMR (300 MHz, DMSO-d6) δ 7.46-7.26 (m, 10H), 7.19 (ddd, J=8.2, 8.2, 6.1 Hz, 1H), 6.89 (s, 1H), 6.83 (dd, J=8.9, 8.9 Hz, 1H), 6.50 (s, 1H), 6.46 (d, J=8.0 Hz, 1H), 6.09 (s, 1H), 4.83 (q, J=9.6 Hz, 2H), 4.14 (dd, J=5.3, 3.2 Hz, 4H); 13C NMR (75 MHz, DMSO-d6) δ 176.3, 157.9 (d, 1JC-F=247 Hz), 144.3, 143.8 (d, 3JC-F=8.4 Hz), 137.2 (d, 3JC-F=13.6 Hz), 130.5 (d, 3JC-F=8.6 Hz), 128.1, 127.8 (d, 3JC-F=9.0 Hz), 119.2, 117.3 (d, 2JC-F=19.0 Hz), 110.4, 110.0 (d, 2JC-F=19.7 Hz), 107.8 (d, 4JC-F=2.8 Hz), 98.7, 77.5, 64.1, 63.5, 58.6, 55.8 (d, 4JC-F=2.8 Hz); MS (ES+) m/z 480.0 (M+1),
