Indole was converted into the 1,4-diacetyl and 1-acetyl-4-(3-chloropropanoyl) derivatives by direct C-4 electrophilic substitution via 4-(trimethylsilyl)indole (3c); the structure of (3c) was confirmed by a single crystal X-ray analysis.
A. G. M. Barrett, D. Dauzonee and D. J. Williams, J. Chem. Soc., Chem. Commun., 1982, 636 DOI: 10.1039/C39820000636
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