Synthesis and siderophore activity of albomycin-like peptides derived from N5-acetyl-N5-hydroxy-L-ornithine
摘要:
N5-Acetyl-N5-hydroxy-L-ornithine (1), the key constituent of several microbial siderophores, has been synthesized in 23 % yield overall from N-Cbz-L-glutamic acid 1-tert-butyl ester (6) derived from L-glutamic acid. Reduction of 6 to 7 and treatment with N-[(trichloroethoxy)carbonyl]-O-benzylhydroxylamine (8), and diethyl azodicarboxylate and triphenylphosphine followed by deprotection produced the protected N5-acetyl-N5-hydroxy-L-ornithine derivatives 11 and 12 in large quantities (10-20 g). Following alpha-amino and alpha-carboxyl deprotections of 11 and 12, EEDQ [2-ethoxy-N-(ethoxycarbonyl)-1,2-dihydroquinoline] mediated peptide coupling and final deprotection provided amino acid 1 and six albomycin-like peptides (20, 23, 25, 28, 35, and 36). The growth-promoting ability of each was evaluated with the siderophore biosynthesis mutant Shigella flexneri SA240 (SA 100 iucD:Tn5). These results indicate that substantial modification of the framework of peptide-based siderophores can be tolerated by microbial iron-transport systems.
Synthesis and siderophore activity of albomycin-like peptides derived from N5-acetyl-N5-hydroxy-L-ornithine
摘要:
N5-Acetyl-N5-hydroxy-L-ornithine (1), the key constituent of several microbial siderophores, has been synthesized in 23 % yield overall from N-Cbz-L-glutamic acid 1-tert-butyl ester (6) derived from L-glutamic acid. Reduction of 6 to 7 and treatment with N-[(trichloroethoxy)carbonyl]-O-benzylhydroxylamine (8), and diethyl azodicarboxylate and triphenylphosphine followed by deprotection produced the protected N5-acetyl-N5-hydroxy-L-ornithine derivatives 11 and 12 in large quantities (10-20 g). Following alpha-amino and alpha-carboxyl deprotections of 11 and 12, EEDQ [2-ethoxy-N-(ethoxycarbonyl)-1,2-dihydroquinoline] mediated peptide coupling and final deprotection provided amino acid 1 and six albomycin-like peptides (20, 23, 25, 28, 35, and 36). The growth-promoting ability of each was evaluated with the siderophore biosynthesis mutant Shigella flexneri SA240 (SA 100 iucD:Tn5). These results indicate that substantial modification of the framework of peptide-based siderophores can be tolerated by microbial iron-transport systems.
Podand- and crown-types of newchiral receptors, characterized by a chiral polyether skeleton and an amide junction, were derivedfromnaturallyoccurringmonensinionophore. Their chiral recognition ability was investigated by ion-selective electrode and 1H-NMR spectroscopic methods. Several podand-type monensin amides formed 1:1 complexes with chiral amine salts and exhibited excellent enantiomer
The crystallization of (R)-arylglycyl-(R)-phenylglycine (1, aryl = phenyl; 2, aryl = 1-naphthyl) in the presence of 1,2-dimethoxybenzene or itsderivatives affords an inclusion compound. A single-crystal X-ray analysis has shown that, in a 1,2-dimethyoxybenzene inclusion compound, dipeptide molecules arrange in a sheet and the 1,2-dimethoxybenzene lies at the end in a void between the sheets by being
(R)-芳基甘氨酰-(R)-苯基甘氨酸(1,芳基=苯基;2,芳基=1-萘基)在1,2-二甲氧基苯或其衍生物存在下的结晶得到包含化合物。单晶 X 射线分析表明,在 1,2-二甲氧基苯包合物中,二肽分子排列成片状,而 1,2-二甲氧基苯通过锚定在片状体之间的空隙中而位于末端片材上的氨氢通过三中心氢键。发现片材之间的距离根据客体 1,2-二甲氧基苯衍生物的长度而变化,就好像它们是支撑片材的柱子一样。
New chiral host molecules derived from naturally occurring monensin ionophore
Chemically modified monensins bearing neutral terminal groups led to effective enantiomer-selective complex formation with several amine salts in a liquid membrane-type electrode system.
Phosphoramidate Derivatives of Guanosine Nucleoside Compunds for Treatment of Viral Infections
申请人:Chamberlain Stanley
公开号:US20120052046A1
公开(公告)日:2012-03-01
Phosphoramidate compounds derived from guanine bases having enhanced therapeutic potency are provided, and these compounds in particular have enhanced potency with respect to treatment of viral infections, such as hepatitis C virus. Pharmaceutical compositions, methods of preparing the compounds, and methods of using the compounds and compositions to treat viral infections are also provided.
Phosphoramidate derivatives of guanosine nucleoside compounds for treatment of viral infections
申请人:Chamberlain Stanley
公开号:US08759318B2
公开(公告)日:2014-06-24
Phosphoramidate compounds derived from guanine bases having enhanced therapeutic potency are provided, and these compounds in particular have enhanced potency with respect to treatment of viral infections, such as hepatitis C virus. Pharmaceutical compositions, methods of preparing the compounds, and methods of using the compounds and compositions to treat viral infections are also provided.