The title compound, C23H19NO2S2, was obtained as an unexpected regioisomer from an attempted synthesis of an intermediate for a substituent-effect study on ergot alkaloids. This is the first report of a 1H-indole monothioating at the 2- and 3-positions to give a 3H-indole. In the crystal, the acid H atom is twisted roughly 180° from the typical carboxy conformation and forms centrosymmetric O - H⋯N hydrogen-bonded dimers with the indole N atom of an inversion-related molecule. Together with a weak C - H⋯O hydrogen bond involving the carbonyl O atom, chains are formed along .
|Original language||English (US)|
|Number of pages||4|
|Journal||Acta Crystallographica Section E: Crystallographic Communications|
|State||Published - 2015|
- O - H⋯N hydrogen bond
- Uhle's ketone
- crystal structure