Synthesis and .beta.-lactamase inhibitory properties of 2.beta.-[(acyloxy)methyl]-2.alpha.-methylpenam-3.alpha.-carboxylic acid 1,1-dioxides
摘要:
p-Nitrobenzyl 2 beta-[(benzoyloxy)methyl]-2 alpha-methylpenam-3 alpha-carboxylate was prepared by reaction of p-nitrobenzyl 2-[2-oxo-3 alpha-bromo-4-(benzothiazol-2-yldithio)azetidin-1-yl] -2-isopropenylacetate with silver benzoate in the presence of iodine. The resulting diester was oxidized to the sulfone with potassium permanganate and hydrogen peroxide, and the bromine and p-nitrobenzyl groups were removed by hydrogenolysis to give potassium 2 beta-(benzoyloxy)methyl 2 alpha-methylpenam-3 alpha-carboxylate 1,1-dioxide. A series of related compounds, including the pivaloyl, methoxybenzoyl, p-fluorobenzoyl, and p-aminobenzoyl derivatives, were prepared in a similar way. All of these compounds were potent beta-lactamase inhibitors in vitro against the TEM beta-lactamase from Klebsiella pneumoniae A22695 and Bacteroides fragiles A22695 but less active against the beta-lactamase from Staphylococcus aureus A9606. All compounds when administered orally in a 1:1 combination with amoxicillin did not show any significant protection of mice infected with S. aureus A9606. 2 beta-(Bromomethyl)-2 alpha-methylpenam-3 alpha-carboxylic acid was prepared and reacted with silver nitrate to give the nitrate ester. Oxidation with potassium permanganate and catalytic reduction afforded 2 beta-(hydroxymethyl)-2 alpha-methylpenam-3 alpha-carboxylic acid 1,1-dioxide. 2 beta-(Bromomethyl)-2 alpha-methylpenam-3 alpha-carboxylic acid 1,1-dioxide was found to be a strong beta-lactamase inhibitor, while the 2 beta-hydroxymethyl compound showed only weak beta-lactamase-inhibiting properties.
Strong Silver‐Silver Interactions in Three Silver(I) Carboxylate Complexes with High Cytotoxicity Properties
作者:Xiu‐Ying Liu、Hai‐Liang Zhu
DOI:10.1081/sim-200055672
日期:2005.5.1
Three carboxylate silver(I) complexes, [Ag(fbc)]n, (1), [Ag2(cpd)]n (2) and [Ag2(idc)]n (3), were prepared and characterized by X‐ray single crystal analysis, where fbcH is 4‐fluorobenzoic acid, cpdH2 is cyclopentane‐1,1‐dicarboxylic acid and idcH2 is iminodiacetic acid. The three coordination polymers show clear Ag–Ag bonds in their structures. The Ag–Ag bond length 2.850 Å both in 1 and 2 is much
Synthetic, Spectroscopic and Biological Studies on Some
μ-Oxy-bis[triphenylantimony(V)]carboxylates and Cyclic Organoantimonates
作者:Surjeet S ingh、Neha Bahuguna、Kiran Singhal、Prem Raj
DOI:10.14233/ajchem.2021.23045
日期:——
A series of hitherto unreported μ-oxy-bis[triphenylantimony(V)]dicarboxylates and μ-oxy-bis[triphenylantimony(V)] chlorocarboxylates of general formula Ph3Sb(L)-O-Sb(L)Ph3 and Ph3Sb(Cl)-O-Sb(L)Ph3, respectively have been synthesized by the metathetical reaction of μ-oxybis-[triphenylantimony(V)]dichloride and silver salts of corresponding carboxylic acids in 1:2 and 1:1 molar ratio [where L = thiosalicyclic
Gold-Catalyzed C–O Cross-Coupling Reactions of Aryl Iodides with Silver Carboxylates
作者:Guifang Chen、Bo Xu
DOI:10.1021/acs.orglett.3c02254
日期:2023.9.1
We have developed a C–O cross-coupling reaction of (hetero)aryl iodides with silver carboxylates via a AuI/AuIII catalytic cycle. The transformation featured exclusive chemoselectivity and moisture/air insensitivity. Aromatic and aliphatic (including primary, secondary, and tertiary) silver carboxylates are all suitable substrates. Moreover, this protocol worked well intermolecularly and intramolecularly
我们开发了(杂)芳基碘化物与羧酸银通过 Au I /Au III催化循环进行的 C-O 交叉偶联反应。该转化具有独特的化学选择性和湿气/空气不敏感性。芳香族和脂肪族(包括伯、仲和叔)羧酸银都是合适的底物。此外,该方案在分子间和分子内均表现良好。最重要的是,无论底物的电子效应和空间位阻如何,都获得了良好的产率。
Arylbis(triphenylphosphinyl)nickel carboxylates
作者:L. S. Isaeva、G. I. Drogunova、A. S. Peregudov、D. N. Kravtsov
DOI:10.1007/bf00962678
日期:1988.1
Clear Ag–Ag bonds in three silver(I) carboxylate complexes with high cytotoxicity properties
作者:Hai-Liang Zhu、Xian-Ming Zhang、Xiu-Ying Liu、Xian-Jiang Wang、Gao-Feng Liu、Anwar Usman、Hoong-Kun Fun
DOI:10.1016/s1387-7003(03)00205-3
日期:2003.8
The reaction of Ag2O and carboxylate ligands in ammonium solution results in three coordination polymers, [Ag(fbc)](n) 1, [Ag-2(cpd)](n) 2 and [Ag-2(idc)](n) 3, where fbcH is 4-fluorobenzoic acid, cpdH(2) is cyclopentane-1,1-dicarboxylic acid and idcH(2) is iminodiacetic acid. The X-ray crystal structural analysis indicates that compounds I and 2 are two-dimensional frameworks and 3 is a three-dimensional framework. All the three complexes show clear Ag-Ag bonds and high cytotoxicity properties to normal cells and carcinoma cells.[GRAPHICS](C) 2003 Elsevier Science B.V. All rights reserved.