Trifluoroacetic acid → 2'-Oxo-1,2'-dihydrospiro[1-benzofuran-3,3'-indole]-6-carbonitrile

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Reaction Steps

To a suspension of 1′-(diphenylmethyl)-2′-oxo-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-6-carbonitrile (1.9 g, 4.4 mmol) in triethylsilane (5.0 mL) was added trifluoroacetic acid (10.0 mL). The solution was heated at reflux for 6 h, allowed to cool to ambient temperature and concentrated in vacuo to obtain 2′-oxo-1′,2′-dihydrospiro[1-benzofuran-3,3′-indole]-6-carbonitrile (0.86 g, 74%) as a colorless solid which was carried forward without purification MS (ES+) m/z 263.0 (M+1).

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