4-chloro-1-(diphenylmethyl)-3-hydroxy-3-(6-hydroxy-2,3-dihydro-1-benzofuran-5-yl)-1,3-dihydro-2H-indol-2-one → 3-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-4,5-dimethoxy-1-{[5-(trifluoromethyl)furan-2-yl]methyl}-1,3-dihydro-2H-indol-2-one

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Reaction Steps

Following the procedure as described in PREPARATION 4C, and making non-critical variations using 3-hydroxy-3-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-4,5-dimethoxy-1-{[5-(trifluoromethyl)furan-2-yl]methyl}-1,3-dihydro-2H-indol-2-one to replace 4-chloro-1-(diphenylmethyl)-3-hydroxy-3-(6-hydroxy-2,3-dihydro-1-benzofuran-5-yl)-1,3-dihydro-2H-indol-2-one, 3-(7-hydroxy-2,3-dihydro-1,4-benzodioxin-6-yl)-4,5-dimethoxy-1-{[5-(trifluoromethyl)furan-2-yl]methyl}-1,3-dihydro-2H-indol-2-one was obtained (83%) as a colorless solid: 1H NMR (300 MHz, CDCl3) δ6.86 (d, J=8.5 Hz, 1H), 6.71-6.67 (m, 1H), 6.66-6.60 (m, 2H), 6.32-6.25 (m, 2H), 5.11 (s, 1H), 4.94-4.76 (m, 2H), 4.23-4.07 (m, 5H), 3.84 (s, 3H), 3.74 (s, 3H).

Provenance & Evidence