Synthetic Studies on the Fluorinated Analogs for the Putative Oxindole-Type Metabolites of 5-Halotryptamines
摘要:
The suitably protected precursors for direct fluorination, N(b)-Boc di-protected 5-fluorotryptamine (13), N(b)-acetyl-N(b)-Boc protected 5-halotryptamines (15a-c), were treated with Selectfluor (TM) in MeCN/water in the presence of NaHCO(3) to give the corresponding 3-fluorooxindoles 14 and 16a-c in good yields. Removal of the protecting groups of 14 and 16a-c produced (3,5-difluorooxindol-3-yl)ethylamine (8) and N-acetyl-(3-fluoro-5-halooxindol-3-yl)ethylamines (9a-c) in excellent yields, respectively. These compounds are potentially non-epimerizable analogs for the putative metabolites of 5-fluorotryptamine (6) and N(b)-acetyl-5-halotryptamines (7a-c).
Palladium-catalyzed synthesis of tryptamines and tryptamine homologues: synthesis of psilocin
摘要:
A new Pd-catalyzed method for the synthesis of tryptamines is developed, and its applications to the synthesis of Corey's aspidophytine tryptamine 15 and psilocin 20 are also described. (C) 2009 Elsevier Ltd. All rights reserved.