The stereostructure of β-trimethylsiloxy-α-trimethylsilyl alkanoic acid silyl esters synthesized by Bellassoued et al. [J. Org. Chem. 2001, 66, 5054–5057] using Mukaiyama aldol reaction has been reassigned using density functional theory NMR 1H chemical shifts calculations. It is now conclude...

SummaryUsing excised buckwheat cotyledons treated with glyphosate to block endogenous supply of aromatic amino acids a comparison of the precursor role of exogenous L-phenylalanine and L-tyrosine in building flavonoids was carried out. Glyphosate reduced biosynthesis of flavonoids from both endo...

Incubation of [2-2H]-valine with purified ACV synthetase from both Cephalosporium acremonium and Streptomyces clavuligerus produced L-δ-(α-aminoadipoyl)-L-cysteinyl-D-valine (ACV), determined by the essentially complete (>95%) loss of deuterium from the α position of the incorporated valine. ...

A group of 4-methoxyphenylacetic acid esters were designed, synthesized and evaluated as potential inhibitors of soybean 15-lipoxygenase (SLO) on the basis of eugenol and esteragol structures. Compounds 7d–e showed the best IC50 in SLO inhibition (IC50 = 3.8 and 1.9 μM, respectively). All comp...

The effect of the alcohol moiety on the enzymatic hydrolysis of different chrysanthemic acid esters has been studied. Of all the enzymes screened, Pig liver esterase (PLE) showed the highest activity. The PLE catalysed hydrolysis was highly trans selective for the acid moiety and S-selective for...

Fourteen new naphthoquinone aliphatic amides and seventeen naphthoquinone aliphatic esters were synthesized in nine to ten steps from 1-hydroxy-2-naphthoic acid with 9–25% overall yield for the amides, and 16–21% overall yield for the esters. The key step of the amide synthesis is a coupling r...

Proton-exchanged montmorillonite (H-mont) was found to be an eco-friendly and cost-effective catalyst for the generation of O-methylated quinone methides (QM) from the corresponding p or o-methoxybenzyl esters and ethers. Nucleophilic trapping of the O-methylated QM with arenes, alcohols, 1,3-di...

A series of aliphatic esters of the non-opioid anaesthetic/analgesic ketamine were prepared and their properties as shorter-acting analogues of ketamine itself were explored in an infused rat model, measuring the time after infusion to recover from both the anaesthetic (righting reflex) and anal...

Thirty-two metabolites and analogues of the antiepileptic drug valproic acid (2-propylpentanoic acid; VPA) were tested for anticonvulsant and toxic effects in mice, in an attempt to find out if any of these compounds were superior to valproic acid. Valproic acid and ethosuximide, another clinica...

A study of literature reports of the concentrations of amino acids in extracts from the Murchison meteorite shows that many of the concentration ratios are constant. There are two possible interpretations of these ratios. One is that they are controlled by the pathways through which the amino ac...

Carbonaceous chondrites carry a record of chemical evolution that is unparalleled among presently accessible natural materials. Within the complex suite of organic compounds that characterize these meteorites, amino acids occur at a total concentration that may reach 0.6 μmole g−1 meteorite (∼...

Valproic acid and several structurally related carboxylic acids and tetrazole analogues have been shown to antagonize seizures induced by pentylenetetrazole in mice. To investigate the influence of the alkyl substituents on the anticonvulsant activity, the octanol-water partition coefficients an...

Branched fatty acids (BAFs) in industrial effluents are often persistent in biological wastewater treatment systems and end up as organic contaminants in the water environment. In this study, degradation of eight characteristic BAFs in a natural anaerobic ecosystem of an eutrophic river sediment...

Low molecular weight monocarboxylic acids are the most abundant water soluble organic compounds in the Murchison and many other CM type carbonaceous chondrites. In this study, we examined the monocarboxylic acids in Murchison and EET96029.20 carbonaceous meteorites using a new sample preparation...

Xenobiotic branched carboxylic acids (BCAs) discharged by industries are often persistent in biological wastewater treatment systems and end up in water and sediments. In this study, the degradation of 12 typical BCAs in an anaerobic environment of river sediment was studied in vitro using enric...

Stereoisomers (enantiomers and diastereoisomers) of synthetic, non-protein amino acids comprising α-, β-, and γ-amino acids, including α,α-dialkyl amino acids, were converted into the respective N-trifluoroacetyl-O-methyl esters and analyzed and resolved by gas chromatography (GC) on a comm...

The derivatives of 3-(4′-bromo-[1,1′-biphenyl]-4-yl)-3-(4-X-phenyl)-N,N-dimethyl-2-propen-1-amine (5a–m) were synthesised through a Friedel–Crafts acylation followed by Wittig reaction. The effects of the compounds on standard strains of Mycobacterium sp. (ATCC) and M. tuberculosis isolated ...

Propenamine derivatives 3-(4′-bromo-[1,1′-biphenyl]-4-yl)-3-(4-X-phenyl)-N,N-dimethyl-2-propen-1-amine (where X=H or Br) were tested in experimentally infected mice with Trypanosoma cruzi (Y strain). When a daily dose of 20 mg kg−1 of the bromo (X=Br) derivative for 9 consecutive days was used...

A composite of cobalt tetracarboxyl phthalocyanine and amino-functionalized manganese octahedral molecular sieve (CNOMS-2) was synthesized in a simple way, and applied for degrading diclofenac in aqueous media by catalyzing of peroxymonosulfate heterogeneously. The experiment results revealed th...

In this study, 4-[2-(3,5-diphenyl-1H-1,2,4-triazol-1-yl)ethoxy]phthalonitrile ET-CN, 3-[2-(3,5-diphenyl-1H-1,2,4-triazol-1-yl)ethoxy]phthalonitrile n-ET-CN and cobalt(II), manganese(III) phthalocyanines bearing [2-(3,5-diphenyl-1H-1,2,4-triazol-1-yl)ethoxy] group at peripheral, non-peripheral po...