A GENERAL SYNTHETIC METHOD OF THE NON-TRYPTAMINE PART OF THE INDOLE ALKALOIDS via SULFUR CONTAINING INTERMEDIATES HAVE BEEN EXAMINED. WE WILL REPORT TWO METHODS; THE α-DIKETOMONOTHIO-KETAL CLEAVAGE AND THE THIO-CLAISEN REARRANGEMENT, WHICH ARE EXPECTED TO BE USEFUL FOR THE SYNTHESIS OF THE ASPIDOSPERMA TYPE AND IBOGA TYPE INDOLE ALKALOIDS.
