Tetrahydropyranone derivatives are promising starting materials for the synthesis of various heterocyclic compounds with biological activity. Oximes obtained on the basis of heterocyclic compounds, which include 3,5-substituted tetrahydropyran-4-one, possess antibacterial activity. We studied the optimal conditions for the synthesis of 3,5 substituted tetrahydropyran-4-one and its oxime, to confirm the obtained structures, and to perform quantum-chemical calculations of the conformations of the target compounds. The optimal method for the 3,5-dimethyleneoxytetrahydropyran-4-one (III) synthesis was the condensation of acetone with formaldehyde in a ratio of 1 : 4 in the presence of K2CO3; the yield was 67.4 %. The reaction of (III) with hydroxylamine hydrochloride was studied in the presence of NaOH and AcONa at different temperatures. The optimal yield (65.3%) of the product (IV) was obtained in the presence of AcONa whit heating below 80 0C. To determine the composition of obtained compounds elemental analysis was used. Functional composition and structural elements were identified using IR spectroscopy. To prove the structure of the synthesized oxime, 1H and 13C NMR spectra were taken on a JNN-ECA Jeol 400 spectrometer (at a frequency of 399.78 MHz and 100.53 MHz) with a CDCl3 solvent. Quantum-chemical calculations of stable conformations of (III) and (IV) was performed using ab initio DFT B3LYP method and 6-31G (d) and 6-311+G(3df,2p) basis sets. Calculated total energies and dipole moments allow to find the geometry of the most stable conformers. The most stable conformer of (IV) is the 3a5a configuration of substituents, which can be explained by the formation of intramolecular hydrogen bonds. Calculations show that the syn- and anti-isomers of 3,5-dimethyleneoxytetrahydropyran-4-one oxime are energetically equivalent.

Key words iridium catalysis - alkynylation - oximes - C–H activation

To establish a gas chromatography-mass spectrometry(GC-MS) method for determination of seven sugars and sugar alcohols in infants Ying Yang Bao nutritional supplements. The samples were extracted with pure water and diluted with 95% ethanol. After being dried by nitrogen, methoxyamine hydrochloride oxime was dissolved in pyridine and derivatized by MSTFA. The capillary column TG-5 Ms(30 m×0. 25 mm, 0. 25 μm) was used for determination by GC-MS. The limits of detection(LODs)were 1. 0-3. 0 mg/g and the limits of quantification(LOQs)were 3. 3-10. 0 mg/g. The average recoveries of seven kinds of sugar and sugar alcohols were 86. 7%-96. 7%, and the relative standard deviation was less than 5. 1%(n=6). The contents of seven sugars and sugar alcohols in soybean matrix nutritional supplements were determined in the range of 0. 25-13. 70 g/100 g, which was consistent with the nutrition label of the products. The method is convenient, mild and fit for batch sample analysis.

Objective To assess the superiority of 99Tcm-3SPboroxime (99Tcm-3SP for short) as a fast-myocardial perfusion imaging (MPI) tracer in normal and acute myocardial infarction (AMI) mini-swine. Methods 99Tcm-3SP and 99Tcm-Teboroxime (99Tcm-TEBO for short) were prepared. Approximately 370 MBq 99Tcm-3SP or 99Tcm-TEBO was injected intravenously in 2 healthy mini-swine separately. Dynamic planar images were acquired immediately after injection and continued for 20 min using a standard SPECT camera. The radioactivity uptakes in the heart, liver, and lungs were measured, and heart/liver and heart/lung ratios over time were calculated. Dynamic SPECT studies were performed in 4 normal swine and 1 AMI-swine using cadmium zinc telluride-SPECT (CZT-SPECT). List mode acquisitions were immediately started and continued for 15 min after intravenous injection of approximately 370 MBq 99Tcm-TEBO and 99Tcm-3SP. The injection of two radiotracers in the same swine was completed within 2 d. The radioactivity uptakes in heart and liver were measured, and heart/liver ratio was calculated. Image quality was also evaluated. Paired t test was used to analyze the data. Results The radiochemical purity of 99Tcm-TEBO or 99Tcm-3SP were both above 95%. The initial heart uptake of 99Tcm-3SP was very close to that of 99Tcm-TEBO (planar image, 2 min postinjection: 309.32×103vs 314.13×103 counts/MBq; SPECT image, 2 min postinjection (corrected): 7.96±0.87 vs 8.24±1.53, t=0.277, P>0.05), but the myocardial retention time was much longer than that of 99Tcm-TEBO (planar image, 20 min postinjection: 218.67×103vs 143.19×103 counts/MBq; SPECT image, 15 min postinjection (corrected): 6.76±0.45 vs 5.06±0.33, t=-12.412, P=0.001). The uptake of liver and heart/liver ratio between 99Tcm-TEBO and 99Tcm-3SP were similar (t values: -1.332-1.101, all P>0.05 within 15 min). SPECT MPI images demonstrated uniform tracer distribution with clearly visualizable myocardial boundary in normal myocardium and intense perfusion defect in infarct myocardium. High quality SPECT images could be obtained in any of the 5 min imaging windows over the first 15 min after injection of 99Tcm-3SP in normal swine and AMI-swine. Conclusion 99Tcm-3SP is a promising 99Tcm-labeled radiotracer for fast-MPI considering its high heart uptake, long myocardial retention time (20 min postinjection) and superior SPECT image quality. Key words: Myocardial perfusion imaging; Oximes; Boronic acids; Technetium; Tomography, emission-computed, single-photon; Swine

Six oxime esters were synthesised and tested for their effectiveness as attractants of Periplaneta Americana cockroaches in the laboratory by the choice chamber method. The oxime esters of cinnamaldoxme, crotonaldoxime and vanilyl oxime formed from palmitoyl and oleoyl chlorides were found to be effective attractants for P. americana cockroaches. The receptor model proposed by others is used to explain this effectiveness.

<p><strong>Summary. </strong>Nerve agents, such as tabun, are covalent inhibitors of acetylcholinesterase (AChE), an essential enzyme in neurotransmission whose inhibition may lead to death. Currently used therapy, consisting of an anticholinergic drug and an oxime as the reactivator of inhibited AChE is particularly ineffective in cases of tabun exposure. Thus, an optimal re-activator is still needed. Click-chemistry, utilizing Cu (I)-catalyzed azide-alkyne cycloaddition of a library of small molecule building blocks, has made possible the rapid synthesis of a variety of new oximes. Among the new oximes tested in recent studies as re-activators of tabun-inhibited choline binding site AChE mutants, oxime <strong>5B</strong>, a lengthened alkylchain congener of the standard oxime 2-PAM, as appeared to be a candidate for tabun <em>ex vivo</em> scavenging when paired with the Y337A mutant of AChE. Herein, we pursued the antidotal <em>in vivo</em> detoxification of tabun-exposed mice by assembling oxime-assisted catalytic scavenging using the mutant combined with oxime <strong>5B. </strong>Although the antidotal treatment requires optimization, our findings offer a platform for further development of more potent means of counteracting tabun and related phosphoramidate exposure.</p>

Despite previously reported high hepatic safety profile of ibuprofen (IBP), but other reports oppose its use in hepatic patients. The aim of this study is to evaluate the possible effect of IBP besides its oxime (OI) and ketone (KI) derivatives in both normal liver and in acute CCl4-induced hepatotoxicity. Sixty adult male Wistar rats were used, divided into 8 groups. Group 1: received saline water as normal control. Groups 2,3,4: treated with IBP, OI or KI respectively. Group 5: treated with CCl4 to induce hepatotoxicity. Groups 6,7,8: treated with IBP, OI or KI respectively 30 minutes before CCl4 administration. Current results showed that despite the apparent hepatotoxic effects of IBP, which were less evident in OI and KI, on normal liver that may be explained by possible immunological idiosyncrasy, they ameliorated both hepatocellular and cholestatic damage induced by CCl4, which may be attributed to their anti-inflammatory and anti-oxidant potential. OI and KI derivatives, rather than IBP, showed higher hepatic safety profile and stronger hepatoprotective potential against acute CCl4-induced hepatotoxicity, which favor their use, instead of IBP, in concurrent hepatic diseases.

Aims: K117 and K127 are bis-pyridinium aldoximes. Both K117 and K127 are developed as potential antidotes in the case of poisoning both acetylcholinesterase and butyrylcholinesterese in terrorist attacks or intoxication with other organophosphorous compounds. Their distribution has been scouted in the body of rats. Main methods: White male Wistar rats were intramuscularly injected. The animals were sacrificed, tissue samples were homogenized, and either K117 or K127 concentrartions were determined using reversed-phase high-performance liquid chromatography. Key findings: Both K117 and K127 were present in all tissues that were analyzed including blood (serum), the brains, cerebrospinal fluid, the eyes, livers, kidneys, lungs and testes. Two novel proper names should be conceptualized in the practice of these antidotes, t1/10 (instead of t1/2) and maximal blood-brain penetration cmaxBBP.(instead of the individual cmax values for blood and also for the brain). Significance: Either K117 or K127 meets the essential requirements for antidotes. Dose dependence and kinetics of their distribution were compared to that of other pyridinium aldoximes.

Methomyl is an oxime carbamate pesticide that is widely used in the Philippines. This insecticide is known to be an endocrine disrupting chemical and a potent genotoxic in mammalian cells. However, limited studies were conducted specifically on its direct effects on estrous cycle and its teratogenic effect. This study aimed to (a) assess the effect of methomyl on the body weight and on the estrous cycle of mice, and; (b) examine the teratogenic effect of methomyl on the progeny of the female albino mice. Five week-old experimental mice in three treatment setups were used in the study for both independent experiments. The treatment schedule for pregnant mice was administered during organogenesis (day 6 to 15 of gestation). Results showed that the average gained weight of the mice of both high dose (HD) and low dose (LD) groups were lower as compared to the average gained weight of the control group but did not show any statistical significant differences (p=0.562). For the experiment 1, methomyl significantly (p=0.013) affect the estrous cycle of the mouse especially in LD group. For experiment 2, results revealed that there was a significant difference among the treatment set-ups (p=0.0001) in terms of fetal morphometric measurement. Furthermore, abnormality and high number of resorption was also observed in both LD and HD treatment groups. Therefore, methomyl significantly affect the body weight, estrous cycle and fetal morphometry. This further confirm that methomyl is an endocrine disrupting and genotoxic chemical that affects the estrous cycle and causes teratogenic effect.

Uncommon condensations of 1,2,3-triketone 2-oximes with o-phenylenediamine

We report a strategy designed for the rapid and convergent assembly of C4-oxime substituted thiazoles. Our approach relied on 3-bromo-2-oxopropanal O-methyl oxime as a key building block. In particular, we describe a multistep continuous synthesis of this intermediate and demonstrate the advantages of our set-up upon scaling up.

Background and objectives Methomyl (MET) [S-methyl N-(methylcarbamoyloxy) thioacetimidate; C5H10N2O2S] is one of the most important carbamate (oximes) insecticides that is extensively used around the world. Carbamate compounds are known to cause an alteration in biochemical parameters and affect the oxidative status of the body through producing free radicals. Many antioxidants have been used to ameliorate the toxic effect of pesticides, but the search for such compounds will always be an urgent need to achieve the optimum degree of amelioration. For this purpose, the present study was designed to evaluate the ameliorating effect of green tea extract (GTE) (Camellia sinensis), sage extract (SE) (Salvia officinalis) and their mixture (GTE+SE) against MET-induced toxicity in male rats. Materials and methods A total of 60 rats (Rattus norvegicus) were divided into 12 groups: one negative control group (water); three positive control groups (GTE, SE, and GTE+SE) as the sole drinking source throughout the experimental duration (28 days); two groups administered MET orally at a dose equivalent to the acceptable daily intake and 10× acceptable daily intake; two groups were specified for GTE with MET two doses; two groups for SE with MET two doses; and two groups for GTE+SE with MET two doses. At the end of the experiment, blood samples were collected for measuring biochemical parameters for liver and kidney, as well as antioxidant enzymes. Results and conclusion The insecticide caused high elevation in aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, urea, creatinine and malondialdehyde levels, and high decline in the levels of butyrylcholinesterase, superoxide dismutase, and total antioxidant capacity. Alterations in these biochemical markers occurred in a dose-dependent manner and were referred to the oxidative stress induced by MET. Co-administration of GTE or SE in conjunction with MET brought most of the tested biochemical parameters to their normal levels, but the mixture (GTE+SE) resulted in superior ameliorating effects as compared with each of the individual extracts. The study introduced novel findings regarding to the protective effect of GTE, SE, and their mixture against MET-induced toxicity in rats.

Background: Novel oximinoethers of indanones / aryloxy indanones were designed, synthesized and evaluated in vitro as antileishmanials against Leishmania donovani. Most of the synthesized compounds (5-12) exhibited 100% inhibition at 10 µg/mL against promastigotes and six compounds (5, 6, 7, 9, 11 and 12) exhibited 100% inhibition at 10 µg/mL with an IC50 in the range of 1.65-4.98 µg/mL against amastigotes. Among all, compounds (5-8 and 11) with monochloro, dichloro and fluoro group on aryloxy moiety exhibited excellent in vitro inhibition, thus providing new structural scaffold that can be further optimized to new antileishmanials agents. Methods: In this we were prepared stereo selective oximes. We explored green synthetic method that is replacing DMF as water. Results: The compounds used in the present study were prepared utilizing previously developed methodology for Mannich-aldol reaction. The synthetic route for the preparation of (E)-2-Imidazol-1- ylmethyl-indan-1-one O-benzyl-oximes 5-8 and aryloxy oximes alkyl azoles of indanone 13 and 14 and 9-12 is outlined in (Scheme 2-4). Earlier, the Mannich-aldol-type reaction is described between ketone, paraformaldehyde and azoles using L-proline as an organic catalyst to yield the 2-hydroxymethyl-2- imidazol-1-ylmethyl-indan-1-one (2). However, we modified the reaction conditions in a green manner by replacing organic toxic solvent DMF to water, reducing temperature and source of Imidazole to yield the same intermediate in excellent yields. We have utilized this intermediate (2) for the synthesis of designed molecules (Prototype I-II) for antileishmanial study. Conclusion: We have designed and synthesized the novel azoles with aryloxy and oximino functions making use of our developed methodology of the water mediated Mannich-aldol-type adducts. The preliminary investigations of biological results revealed that, these compounds have potential as antileishmanial agents and has opened a new avenue for further exploration. Keywords: Leishmania, azoles, imidazoles, aryloxy indanone, leishmania, chemotherapy.

We describe semi-syntheses of the 11-hydroxyrotenoids sumatrol (1) and villosinol (2), starting from rotenone (5), using an oxime-directed C11-H functionalisation approach. Thus, rotenone (5) was converted into rotenone oxime (6), which gave dimeric palladacycle 7 following reaction with Na2PdCl4·3H2O. Controlled, divergent, oxidation of palladacycle 7 with either Pb(OAc)4 or K2Cr2O7 afforded the 11-acetoxylated intermediates 9 and 13, respectively, which were transformed into sumatrol (1) and villosinol (2).

Sarin (GB, O-Isopropyl methylphosphonofluoridate) is an organophosphate neurotoxic agent that inhibits irreversibly acetylcholinesterase (AChE). Next, the accumulation of acetylcholine (ACh) in the central nervous system (CNS) causes convulsions and, in high dosage, centrally mediated respiratory failure. The ACh accumulation at peripheral vegetative synapses level leads to peripheral signs of intoxication and overstimulation of muscarinic and nicotinic receptors, which is described as “cholinergic crisis” (diarrhea, perspiration, salivation, miosis, bronchospasm). The exposure to high dosage of Sarin may lead to tremor, convulsions and hypothermia. More seriously, the accumulation of ACh at neuromuscular junctions’ level may also cause paralysis and peripherally mediated respiratory failure that can lead to death by breathing arrest. In addition to the main action on the cholinergic system, Sarin has other secondary effects. These involve activating some neurotransmitters including the gamma-amino-butyric acid (GABA) and alteration of other cellular signaling systems, such as the ionic channels, cellular adhesion molecules and inflammation regulators. The Sarin exposure is associated with symptoms of late neurotoxicity induced by organophosphates and chronic neurotoxicity induced by organophosphates. Moreover, Sarin has been involved in the toxic and immunotoxic effects such as endocrine disorders induced by organophosphates. The standard treatment for exposure to the Sarin neurotoxin is a post-exposure injection with atropine, an antagonist of muscarinic receptors, followed by oxime, an AChE reactivator, and diazepam.

Objective To investigate the effect of different doses of pralidoxime chloride on clinical outcome including recovery rate and mortality in patients with acute organophosphorus pesticide poisoning. Methods According to the total amount of pralidoxime chloride administered over the first 24 hours or entire duration of hospitalization, a cohort of 163 organophosphorus pesticide poisoning patients, admitted from February 2004 to December 2014 were assigned to different groups followed by a retrospective analysis. Comparisons of recovery rate, mortality rate, mean length of hospital stay, and duration of mechanical ventilation were made among groups. SPSS 18.0 was used to analyze categorical variables between the data of groups with χ2 test/Fisher exact probability method and numerical variables with t test or One-way ANOVA, and statistical significance was set as P<0.05. Results According to the amount of pralidoxime chloride given over the first 24 hours, the recovery rate and the mortality rate were significantly improved in the experimental group (pralidoxime chloride>2 g) than in the control group (pralidoxime chloride 4 g) (P=0.034). Based on the total amount of pralidoxime chloride prescribed in the entire duration of hospital stay, the recovery rate and mortality rate were significantly better in the experimental group than those in control group (P=0.002), and among the three dose-response subgroups, the significant difference in recovery rate and mortality rate were also observed (P=0.006). Conclusions Increased amounts of pralidoxime chloride prescribed in the first 24 hours and in the whole hospitalized period can improve the recovery rate and reduce the mortality rate in organophosphorus pesticide poisoning patients. Key words: Acute organophosphorus pesticide poisoning; Insecticide; Pesticide poisoning; Cholinesterase agents; Oxime; Pralidoxime chloride; Pralidoxime iodide; Antidote; Dosage

The review summarizes the data on the synthesis of O-hetarylhydroxylamine derivatives (mainly oximes) published since the 1960s.

Key words pyridols - oximes - cyclization - rearrangement - potassium carbonate

Synthesis of Pyridines via Copper-catalyzed Reaction of Oxime Acetates with Benzyl Alcohols

Some oxime ether derivatives of α-ionone (4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-one) have been synthesized. Reaction of 4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-ketoxime with various chloro and fluoro aromatic and hetero aromatic compounds gave the corresponding oxime ether derivatives via aromatic nucleophilic substitution (SNAr). The structures of these compounds were elucidated by IR, 1H NMR, 19F NMR and 13C NMR spectroscopic methods. All the compounds were screened in vitro against the common pistachio psylla, Agonoscena pistaciae, fifth instar nymphs. Results showed that compound 3c (LC50 value of 227.76 mg l-1) was much more toxic to fifth instar nymphs ofcommon pistachio psylla than compound 3a (LC50 = 1539.14 mg l-1) and compound 3f (LC50 = 569.319 mg l-1).