New, Concise Route to Indoles Bearing Oxygen or Sulfur Substituent at the 4-Position. Synthesis of (.+-.)- and (S)-(-)-Pindolol and (.+-.)-Chuangxinmycin.
A new method for synthesis of 4-substituted indoles has been developed by using the 7-arylthio-6-7-dihydroindol-4(5H) one5 as a common intermediate. The method was applied to the synthesis of (S)-(−)-pindolol (11) and (±)-chuangxinmycin (16).