Abstract
The intramolecular Friedel-Crafts acylation of 2-(3-indolythio)propionic acid 1 has been found to undergo an unprecedented rearrangement to provide a novel tricyclic indole having the sulfur substituted on C-4 rather than on the expected C-3. A mechanism for its formation is proposed. This rearrangement also proceeded with good optical retention when a chiral substrate was used.
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