Triethylsilane → 7-bromo-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one

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Reaction Steps

To a solution of 7-bromo-3-hydroxy-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one (9.50 g, 27.3 mmol) in trifluoroacetic acid (24 mL) at 0° C. was added triethyl silane (6.12 g, 52.8 mmol). The mixture was stirred at ambient temperature for 3 h. The reaction was quenched by the addition of hexanes and diethyl ether mixture (2:1, 300 mL). The precipitate was filtered, washed with hexanes and ether mixture (100 mL). The solid was dried under reduced pressure to afford 7-bromo-3-(6-hydroxy-1,3-benzodioxol-5-yl)-1,3-dihydro-2H-indol-2-one (8.40 g, 93%) as an off-white powder: 1H NMR (300 MHz, DMSO-d6) δ10.67 (s, 1H), 9.26 (s, 1H), 7.33-7.31 (m, 1H), 6.90-6.78 (m, 2H), 6.68 (s, 1H), 6.38 (s, 1H), 5.91 (d, J=1.0 Hz, 2H), 4.75 (s, 1H); MS (ES+) m/z 347.9 (M+1), 349.9 (M+1).

Provenance & Evidence