Tetramic acids and indole derivatives from amino acid β-keto esters. Fine-tuning the conditions of the key Cu-catalyzed reaction
摘要:
1,3,5-Trisubstituted tetramic acids and 2,3-disubstituted indole derivatives were prepared from beta-keto esters derived from amino acids by their reaction with iodopheny1-2-trifluoroacetylamine under Cu-catalysis. Both heterocyclic systems were generated from the same starting materials by choice of the appropriate reaction conditions. (C) 2014 Elsevier Ltd. All rights reserved.
A Mild Titanium-Catalyzed Synthesis of Functionalized Amino Coumarins as Fluorescence Labels
作者:Lisa Wirtz、Uli Kazmaier
DOI:10.1002/ejoc.201101117
日期:2011.12
cytoplasma into synaptic vesicles. This allows tomonitor the uptake and release of neurotransmitters, forexample during synaptic vesicle fusion with the plasmamembrane.Based on our previous work on the synthesis of naturalproducts and drugs,
Dolastatin 10 (1) is a potent antineoplastic pentapeptide. Novel dolastatin 10 analogs each modified at one of the constituent amino acid derivatives, were synthesized and their antitumoractivity was evaluated against P388 leukemia in mice. The structuralrequirements for antitumoractivity are discussed. Some of the analogs, 31c, 35c, 38b, and 50c showed excellent activity in vivo. Highly active 50c
New transient receptor potential TRPV1, TRPM8 and TRPA1 channel antagonists from a single linear β,γ-diamino ester scaffold
作者:Paula Pérez-Faginas、M. Teresa Aranda、Roberto de la Torre-Martínez、Susana Quirce、Asia Fernández-Carvajal、Antonio Ferrer-Montiel、Rosario González-Muñiz
DOI:10.1039/c5ra25709c
日期:——
screening campaign identified nine β,γ-diamino ester derivatives as TRP modulators. A discrete library of new derivatives (23 components) was prepared in a one-pot two step reductive amination reaction, and evaluated for their ability to block the agonist-induced calcium influx in cells expressing human TRPV1, TRPM8 and TRPA1 channels. Selectiveantagonists for each channel, as well as dual TRPV1/TRPM8
Baker's yeast reduction of N-tert-butoxycarbonyl (Boc) or N-benzyloxycarbonyl(Cbz) protected methyl 4-amino-3-oxopentanoates 4b-e and 4-amino-3-oxobutanoates 7a,b stereoselectively afforded the erythro-hydroxy esters 5b-e and (R)-hydroxy esters 8a, b, respectively. The resulting N-protected methyl (R) -4-amino-3-hydroxybutanoate (8) was converted into the biologically active substances, sperabillin C 1c and (R)-GABOB [(R)4-amino-3-hydroxybutanoic acid. 2].