4-bromo-3-hydroxy-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1-pentyl-1,3-dihydro-2H-indol-2-one → ethyl [5-chloro-3-(6-hydroxy-2,3-dihydro-1-benzofuran-5-yl)-2-oxo-2,3-dihydro-1H-indol-1-yl]acetate

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Following the procedure as described in PREPARATION 1D, and making non-critical variations to replace 4-bromo-3-hydroxy-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1-pentyl-1,3-dihydro-2H-indol-2-one with ethyl [5-chloro-3-hydroxy-3-(6-hydroxy-2,3-dihydro-1-benzofuran-5-yl)-2-oxo-2,3-dihydro-1H-indol-1-yl]acetate, the title compound was obtained (94%) as a white solid: 1H NMR (300 MHz, CDCl3) δ 7.30-7.24 (m, 2H), 6.72 (d, 1H), 6.66 (s, 1H), 6.39 (s, 1H), 5.05 (s, 1H), 4.53-4.46 (m, 4H), 4.21 (q, 2H), 3.14-2.94 (m, 2H), 1.25 (t, 3H); MS (ES+) m/z 388.8 (M+1).

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