Intramolecular Pictet-Spengler reaction of N-alkoxytryptamines. 3. Stereoselective synthesis of (-)-debromoeudistomin L and (-)-O-methyldebromoeudistomin E and their stereoisomers
Formation of the oxathiazepine ring in eudistomins 1 was investigated. Thiazolidinyl-β-carboline 5 was successfully transformed into thiaindoloquinolizidine 7, but attempted oxidative transformation of 7 to 1 was not successful. The oxidative cyclization of 1-substituted-2 hydroxy-β-carboline 24 with NCS or the acid-catalyzed cyclization of the corresponding S-oxide 26 with TsOH gave oxathiazepine