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https://www.readbyqxmd.com/read/28641015/a-regioselective-approach-to-trisubstituted-pyrazoles-via-palladium-catalyzed-oxidative-sonogashira-carbonylation-of-arylhydrazines
#1
Yongliang Tu, Zhenming Zhang, Tao Wang, Jiamei Ke, Junfeng Zhao
A palladium-catalyzed oxidative carbonylation of arylhydrazines and alkynes with balloon pressure CO/O2 to afford trisubstituted pyrazoles in a one-pot manner has been developed. The formation of trisubstituted pyrazoles involves a sequential C-N bond cleavage, carbonylation, Sonogashira coupling, Michael addition, and intramolecular condensation cyclization tandem process. An unprecedented oxidative Sonogashira-carbonylation reaction of arylhydrazine plays a key role for such a facile approach to pyrazoles...
June 22, 2017: Organic Letters
https://www.readbyqxmd.com/read/28640963/a-truncated-molecular-star
#2
Soumyakanta Prusty, Kohei Yazaki, Michito Yoshizawa, Dillip Kumar Chand
Pentanuclear coordination complex assembled from palladium(II) component and non-chelating ligand(s) is hitherto unreported. The pentanuclear complex [Pd5(L1)5(L2)5](BF4)10, 1 that was prepared by the spontaneous complexation of [Pd(DMSO)4](BF4)2 with the non-chelating bidentate ligands 1,4-phenylenebis(methylene) diisonicotinate, L1 and 4,4'-bipyridine, L2 in one-pot at room temperature is reported here. The planar polycyclic complex 1 with outer diameters of ~3 nm is termed as a "molecular star" owing to its resemblance with "star pentagon" shape...
June 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28640624/synthesis-of-4-acylpyrazoles-from-saturated-ketones-and-hydrazones-featured-with-multiple-c-sp3-h-bond-functionalization-c-c-bond-cleavage-and-re-organization
#3
Miaomiao Tian, Xiaonan Shi, Xinying Zhang, Xuesen Fan
In this paper, an efficient and convenient one-pot synthesis of diversely substituted 4-acylpyrazole derivatives via copper-catalyzed one pot cascade reactions of saturated ketones with hydrazones is reported. Mechanistically, the formation of the title compounds involves the in situ formation of an enone intermediate through the dehydrogenation of saturated ketone, and the [2+3] cyclization of enone with hydrazone followed by an aromatization-driven C-C bond cleavage and re-organization. To our knowledge, this should be the first example in which the biologically and pharmaceutically important yet otherwise difficult-to-obtain 4-acylpyrazole derivatives were directly prepared from saturated ketones and hydrazones featured with multiple aliphatic C-H bond functionalization, C-C bond cleavage and re-organization...
June 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28637347/mechanisms-underlying-the-long-term-survival-of-the-monocot-dracaena-marginata-under-drought-conditions
#4
Radek Jupa, Roman Plichta, Zuzana Paschová, Nadezhda Nadezhdina, Roman Gebauer
Efficient water management is essential for the survival of vascular plants under drought stress. While interrelations among drought stress, plant anatomy and physiological functions have been described in woody dicots, similar research is very limited for non-palm arborescent and shrubby monocots despite their generally high drought tolerance. In this study, potted transplants of Dracaena marginata Lam. in primary growth stage were exposed to several short- and long-term drought periods. Continuous measurements of sap flow and stem diameter, the evaluation of capacitance and leaf conductance, the quantification of non-structural carbohydrates (NSC), and organ-specific anatomical analyses were performed to reveal the mechanisms promoting plant resistance to limited soil moisture...
June 14, 2017: Tree Physiology
https://www.readbyqxmd.com/read/28636379/a-one-pot-assembly-of-fully-substituted-alkyl-5-aminothiophene-2-carboxylates-from-allenes-isothiocyanates-and-alkyl-2-bromoacetates
#5
Nina A Nedolya, Ol'ga A Tarasova, Alexander I Albanov, Boris A Trofimov
A novel simple approach to highly functionalized multisubstituted thiophenes such as alkyl 4-alkoxy-5-amino-3-methylthiophene-2-carboxylates through the one-pot sequential reaction of α-lithiated alkoxyallenes with isothiocyanates and alkyl 2-bromoacetates has been discovered. The process proceeds quickly (30-45 min) via in situ formation and intramolecular cyclization of alkyl 2-[(2-alkoxybuta-2,3-dienimidoyl)sulfanyl]acetates (1-aza-1,3,4-trienes).
June 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28636375/one-pot-synthesis-of-functionalized-carbazoles-via-a-can-catalyzed-multicomponent-process-comprising-a-c-h-activation-step
#6
Juan Francisco González, Damiano Rocchi, Tomas Tejero, Pedro Merino, J Carlos Menéndez
The microwave-promoted three-component reaction between o-nitrochalcones, primary amines and β-dicarbonyl compounds in the presence of Ce(IV) ammonium nitrate constitutes the first example of a multicomponent carbazole syntrhesis. This reaction furnishes highly substituted and functionalized carbazole derivatives via a double annulation process that generates two C-C and two C-N bonds, with water as the only side product. Mechanistically, this process has some unusual features that include an intramolecular coupled hydrogenation-dehydrogenation process, the functionalization of a C-H group by direct attack onto a nitrogen function and a CAN-catalyzed reduction via hydride transfer from ethanol...
June 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28636370/an-access-to-fused-tricyclic-%C3%AE-butyrolactones-a-natural-product-like-scaffold
#7
Hanuman Popat Kalmode, Kishor L Handore, D Srinivasa Reddy
Serendipitous findings of an acid mediated skeletal rearrangement of bicyclo-β-ketoester having cyclopropyl ring to access fused tricyclic γ-butyrolactones has been described. This novel transformation has been optimized to 30 mole % p-toluenesulphonic acid (p-TSA) in toluene using Dean-Stark apparatus, where the aldol condensation, cyclopropyl ring opening followed by cyclization took place in a single-pot operation. The resulting tricyclic compounds are interesting chemotype with natural product resemblance, may find useful applications in the future...
June 21, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28636010/engineering-multi-functional-bacterial-outer-membrane-vesicles-as-modular-nanodevices-for-biosensing-and-bioimaging
#8
Qi Chen, Sharon Rozovsky, Wilfred Chen
Outer membrane vesicles (OMVs) are proteoliposomes derived from the outer membrane and periplasmic space of many Gram-negative bacteria including E. coli as part of their natural growth cycle. Inspired by the natural ability of E. coli to sort proteins to both the exterior and interior of OMVs, we reported here a one-pot synthesis approach to engineer multi-functionalized OMV-based sensors for both antigen binding and signal generation. SlyB, a native lipoprotein, was used a fusion partner to package nanoluciferase (Nluc) within OMVs, while a previously developed INP-Scaf3 surface scaffold was fused to the Z-domain for antibody recruiting...
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28635999/carbon-dots-promoted-vanadium-flow-batteries-for-all-climate-energy-storage
#9
Ying Zhou, Le Liu, Yi Shen, Lantao Wu, Lihong Yu, Feng Liang, Jingyu Xi
We report a one-pot solvothermal method to prepare a carbon dots decorated graphite felt (CDs/GF) electrode. The resulting CDs/GF shows excellent wettability and greatly enhanced activity towards vanadium redox couples. VFB with the CDs/GF electrode exhibits outstanding rate performance, superior cycling stability, and broad temperature adaptability from -20 to 60 °C.
June 21, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28634485/nitrogen-can-alleviate-the-inhibition-of-photosynthesis-caused-by-high-temperature-stress-under-both-steady-state-and-flecked-irradiance
#10
Guanjun Huang, Qiangqiang Zhang, Xinghai Wei, Shaobing Peng, Yong Li
Nitrogen is one of the most important elements for plants and is closely related to photosynthesis. High temperature stress significantly inhibits photosynthesis under both steady-state and flecked irradiance. However, it is not known whether nitrogen can affect the decrease in photosynthesis caused by high temperature, especially under flecked irradiance. In the present study, a pot experiment was conducted under two nitrogen (N) supplies with rice plants, and the steady-state and dynamic photosynthesis rates were measured under 28 and 40°C...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28634482/whole-plant-temperature-manipulation-affects-flavonoid-metabolism-and-the-transcriptome-of-grapevine-berries
#11
Chiara Pastore, Silvia Dal Santo, Sara Zenoni, Nushin Movahed, Gianluca Allegro, Gabriele Valentini, Ilaria Filippetti, Giovanni Battista Tornielli
Among environmental factors, temperature is the one that poses serious threats to viticulture in the present and future scenarios of global climate change. In this work, we evaluated the effects on berry ripening of two thermal regimes, imposed from veraison to harvest. Potted vines were grown in two air-conditioned greenhouses with High Temperature (HT) and Low Temperature (LT) regimes characterized by 26 and 21°C as average and 42 and 35°C as maximum air daily temperature, respectively. We conducted analyses of the main berry compositional parameters, berry skin flavonoids and berry skin transcriptome on HT and LT berries sampled during ripening...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28634430/evaluation-of-four-bait-traps-for-sampling-wireworm-coleoptera-elateridae-infesting-cereal-crops-in-montana
#12
Anuar Morales-Rodriguez, Aracely Ospina, Kevin W Wanner
The basic principles of a reliable integrated pest management program include pest identification, monitoring, and distribution. Selecting the appropriate sampling protocol to monitor wireworm for research or applied entomology depends on the objective, including simply detecting the presence or absence of wireworm, surveying the composition of wireworm assemblages, or estimating spatial and temporal population densities. In this study, the efficacy of pitfall, stocking, pot, and canister traps baited with wheat and barley mixtures was evaluated for monitoring wireworm populations in four commercial cereal fields in Montana...
2017: International Journal of Insect Science
https://www.readbyqxmd.com/read/28634397/one-pot-hydrothermal-synthesis-of-cds-decorated-cus-microflower-like-structures-for-enhanced-photocatalytic-properties
#13
Xiaolong Deng, Chenggang Wang, Hongcen Yang, Minghui Shao, Shouwei Zhang, Xiao Wang, Meng Ding, Jinzhao Huang, Xijin Xu
CdS decorated CuS structures have been controllably synthesized through a one-pot hydrothermal method. The morphologies and compositions of the as-prepared samples could be concurrently well controlled by simply tuning the amount of CdCl2 and thiourea. Using this strategy, the morphology of the products experienced from messy to flower-like morphologies with multiple porous densities, together with the phase evolution from pure CuS to the CdS/CuS composites. Serving as a photocatalyst, the samples synthesized with the addition of 1 mmol cadmium chloride and 3 mmol thiourea during synthetic process, showed the best photocatalytic activity, which could reach a maximum photocatalytic efficiency of 93% for methyl orange (MO) photodegradation after 150 min...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28634386/shape-and-composition-control-of-monodisperse-hybrid-pt-coo-nanocrystals-by-controlling-the-reaction-kinetics-with-additives
#14
Hyunje Woo, Eunji Kim, Jun-Hyuk Kim, Su-Won Yun, Ji Chan Park, Yong-Tae Kim, Kang Hyun Park
Here, we report the effect of Fe(CO)5 additives in the synthesis of branched Pt-CoO nanowires (NWs) and core@shell concave nanocubes (NCs), in a one-pot system. Key to the success of this synthesis is control over the shape of the Pt seeds by controlling the quantity of Fe(CO)5 additive. In the absence of Fe(CO)5, branched Pt-CoO NWs were synthesized through the attachment of small Pt seed particles, followed by the growth of CoO by deposition. On the other hand, Pt@CoO concave NCs were obtained in the presence of Fe(CO)5 because of the stronger adsorption of Co on the Pt (100) surfaces than on the closely packed (111) surfaces...
June 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28633810/sonochemical-rate-enhanced-by-a-new-nanomagnetic-embedded-core-shell-nanoparticles-and-catalytic-performance-in-the-multicomponent-synthesis-of-pyridoimidazoisoquinolines
#15
Ali Maleki, Morteza Aghaei
A sonochemical approach for the one-pot three-component synthesis of pyridoimidazoisoquinolines via by using phthalaldehyde, trimethylsilylcyanide and aminopyridines the presence of a catalytic amount of a new nanomagnetic catalyst Fe3O4@SiO2-CO-C6H4-NH2 is described. The characterization of the nanocatalyst and the product was done by various methods, such as FT-IR, SEM, EDX, TGA/DTA, NMR, MS and CHN analyses. This is the first design, preparation, characterization and application of the present core/shell nanomaterial and also the first ultrasound irradiated synthesis of the biologically and pharmaceutically important fused polycyclic compounds in ethanol as a green solvent...
September 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28633518/the-optimization-of-siderophore-production-by-bacillus-sp-pz-1-and-its-potential-enhancement-on-phytoextration-of-pb-from-soil
#16
Sumei Yu, Chunying Teng, Xin Bai, Jinsong Liang, Tao Song, Liying Dong, Yu Jin, Juanjuan Qu
In this study, the siderophore-producing characteristics and conditions of Bacillus sp. PZ-1 were investigated and the enhancement of siderophores on Pb uptake and translocation in Brassica juncea were determined. Results of single factor experiment showed that glucose, pH and Pb(NO3)2 could stimulate PZ-1 growth and siderophore production. The maximum siderophore production of 90.52% siderophore units was obtained by response surface methodology optimization at glucose concentration of 21.84 g/l, pH 6.18 and Pb(NO3)2 concentration of 245...
June 21, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28633516/synthesis-of-curcumin-glycosides-with-enhanced-anti-cancer-properties-using-one-pot-multi-enzyme-glycosylation-technique
#17
Rit Bahadur Gurung, So Youn Gong, Tuoi Thi Le, Dipesh Dhakal, Narae Jung, Hye Jin Jung, Tae Jin Oh, Jae Kyung Sohng
Curcumin is a natural polyphenolic compound, widely acclaimed for its antioxidant, anti-inflammatory, antibacterial and anti-cancerous properties. However, its use has been limited due to low-aqueous solubility and poor bioavailability, rapid clearance and low cellular uptake. In order to assess the effect of glycosylation on pharmacological properties of curcumin, the one-pot multi-enzyme (OPME) chemoenzymatic glycosylation reactions with UDP-α-D-glucose or UDP-α-D-2-deoxyglucose as donor substrate were employed...
June 21, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28631861/renewable-molecular-flasks-with-nadh-models-combination-of-light-driven-proton-reduction-and-biomimetic-hydrogenation-of-benzoxazinones
#18
Liang Zhao, Jianwei Wei, Junhua Lu, Cheng He, Chunying Duan
Using small molecules with defined pockets to catalyze chemical transformations resulted in attractive catalytic syntheses that echo the remarkable properties of enzymes. By modulating the active site of a nicotinamide adenine dinucleotide (NADH) model in a redox-active molecular flask, we combined biomimetic hydrogenation with in situ regeneration of the active site in a one-pot transformation using light as a clean energy source. This molecular flask facilitates the encapsulation of benzoxazinones for biomimetic hydrogenation of the substrates within the inner space of the flask using the active sites of the NADH models...
June 20, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28631466/enhancing-the-performance-of-polymer-solar-cells-by-using-donor-polymers-carrying-discretely-distributed-side-chains
#19
Xue Gong, Guangwu Li, Yang Wu, Jicheng Zhang, Shiyu Feng, Yahui Liu, Cuihong Li, Wei Ma, Zhishan Bo
Three-component conjugated polymers P1-1 and P1-2 were prepared by one-pot Stille cross-coupling reaction and applied for polymer solar cell (PSCs). The two-component polymer P1-0 only comprises 5-flouro-6-alkyloxybenzothiadiazole (AFBT) acceptor unit and thiophene donor unit; while the three-component polymers P1-1 and P1-2 contain 10% and 20% 5,6-difluorobenzothiadiazole (DFBT), respectively, as the third component. The incorporation of the third component, 5,6-difluorobenzothiadiazole, makes the side chains discretely distributed in the polymer backbones, which can enhance the π-π stacking of polymers in film, markedly increase the hole mobility of active layers, and improve the power conversion efficiency (PCE) of devices...
June 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28631114/derivatization-of-dextran-for-multiply-charged-ion-formation-and-electrospray-ionization-time-of-flight-mass-spectrometric-analysis
#20
Jesus B Tapia, Hailey A J Hibbard, Melissa M Reynolds
We present the use of a simple, one-pot derivatization to allow the polysaccharide dextran to carry multiple positive charges, shifting its molecular weight distribution to a lower m/z range. We performed this derivatization because molecular weight measurements of polysaccharides by mass spectrometry are challenging because of their lack of readily ionizable groups. The absence of ionizable groups limits proton abstraction and suppresses proton adduction during the ionization process, producing mass spectra with predominantly singly charged metal adduct ions, thereby limiting the detection of large polysaccharides...
June 19, 2017: Journal of the American Society for Mass Spectrometry
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