4-Bromo-3-(6-hydroxybenzo[d][1,3]dioxol-5-yl)-3-(hydroxymethyl)indolin-2-one → 4'-bromospiro[furo[2,3-f][1,3]benzodioxole-7,3'-indol]-2'(1H)-one

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Following the procedure as described in EXAMPLE 1.22, and making non-critical variations using 4-bromo-3-(6-hydroxy-1,3-benzodioxol-5-yl)-3-(hydroxymethyl)-1,3-dihydro-2H-indol-2-one to replace 4,7-dichloro-3-(6-hydroxy-1,3-benzodioxol-5-yl)-3-(hydroxymethyl)-1-pentyl-1,3-dihydro-2H-indol-2-one, the title compound was obtained in 71% yield as a colorless solid: 1H NMR (300 MHz, DMSO-d6) δ 10.79 (s, 1H), 7.19-7.08 (m, 2H), 6.90 (dd, 1H), 6.58 (s, 1H), 6.25 (s, 1H), 5.90 (d, 2H), 4.74 (ABq, 2H); 13C NMR (75 MHz, DMSO-d6) δ 178.5, 157.0, 148.8, 144.5, 141.9, 131.2, 130.6, 126.1, 119.2, 117.5, 109.8, 103.3, 101.8, 93.3, 77.6, 59.7; MS (ES−) m/z 360.4 (M−1), 358.4 (M−1).

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