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).
Abstract Aqueous methanolic potassium carbonate under reflux has been demonstrated to be a highly effective deprotective agent for the tert‐butyl carbamates of indoles, indazoles, carbazole, thiazoloindole, and pyrrole. The method is a mild one and is particularly expeditious for NH‐heteroarenes bearing electron‐withdrawing groups.
A Procedure for Transforming Indoles into Indolequinones
作者:Andrew S. Eastabrook、Christy Wang、Emma K. Davison、Jonathan Sperry
DOI:10.1021/jo502509s
日期:2015.1.16
A procedure that converts a series of structurally diverse, readily available indole derivatives to their corresponding indolequinones is described. The three-step route commences with an iridium catalyzed C-H borylation to give a 7-borylindole that upon oxidationhydrolysis affords the 7-hydroxyindole. Subsequent oxidation provides the indolequinone.
Palladium-catalyzed synthesis of tryptamines and tryptamine homologues: synthesis of psilocin
作者:Chunmei Hu、Hua Qin、Yuxin Cui、Yanxing Jia
DOI:10.1016/j.tet.2009.09.050
日期:2009.11
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.