Nitrogen Alkylation of schiff bases and amidines as a route to N-alkyl amino acids
作者:Martin J. O'Donnell、William A. Bruder、Byron W. Daugherty、Deshan Liu、Krzysztof Wojciechowski
DOI:10.1016/0040-4039(84)80096-9
日期:1984.1
Schiff base and amidine ester 3 are alkylated and then hydrolyzed to yield N-alkylaminoacids 4 in 41–75% yield with high to complete retention of optical activity.
A new type of chiral pyridoxamines bearing an adjacent chiral stereocenter has been developed via multi-step synthesis. The pyridoxamines displayed catalytic activity in asymmetric transamination of α-keto acids to give a variety of optically active amino acids in 27–78% yields with 34–62% ee’s under very mildconditions. This work provides a synthetic strategy to construct newchiral pyridoxamines
Lipidic peptides X. Synthesis, structural and physico-chemical elucidation of lipidic amino acid conjugates with hydrophilic compounds
作者:Istvan Toth、Graeme J. Anderson、Rohanah Hussain、Ian P. Wood、Esther del Olmo Fernandez、Peter Ward、William A. Gibbons
DOI:10.1016/s0040-4020(01)88194-1
日期:——
Lipidicaminoacids 1a, c and dimer 1b were coupled to highly hydrophilic compounds, lactic, glycolic and gluconic acids and protected gulonic acid, yielding conjugates 1d,f,h,i,j,l and o. After carboxyl deprotection, acids e,g and m and were obtained. Physico-chemical investigations of these compounds were carried out using proton nuclear magnetic resonance. Plots of chemical shift versus concentration
Hussain, Rohanah; Toth, Istvan; Gibbons, William A., Liebigs Annalen der Chemie, 1991, # 9, p. 963 - 966
作者:Hussain, Rohanah、Toth, Istvan、Gibbons, William A.
DOI:——
日期:——
Pro-apoptotic activity of lipidic α-amino acids isolated from Protopalythoa variabilis
作者:Diego Veras Wilke、Paula Christine Jimenez、Renata Mendonça Araújo、Wildson Max Barbosa da Silva、Otília Deusdênia Loiola Pessoa、Edilberto Rocha Silveira、Claudia Pessoa、Manoel Odorico de Moraes、Mariusz Skwarczynski、Pavla Simerska、Istvan Toth、Letícia Veras Costa-Lotufo
DOI:10.1016/j.bmc.2010.09.027
日期:2010.11
Lipidic alpha-amino acids (LAAs) have been described as non-natural amino acids with long saturated or unsaturated aliphatic chains. In the continuing prospect to discover anticancer agents from marine sources, we have obtained a mixture of two cytotoxic LAAs (1a and 1b) from the zoanthid Protopalythoa variabilis. The anti-proliferative potential of 14 synthetic LAAs and 1a/1b were evaluated on four tumor cell lines (HCT-8, SF-295, MDA-MB-435, and HL-60). Five of the synthetic LAAs showed high percentage of tumor cell inhibition, while 1a/1b completely inhibited tumor cell growth. Additionally, apoptotic effects of 1a/1b were studied on HL-60 cell line. 1a/1b-treated cells showed apoptosis morphology, loss of mitochondrial potential, and DNA fragmentation. (C) 2010 Elsevier Ltd. All rights reserved.