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  • 1
    Language: English
    In: The Journal of organic chemistry, 19 August 2011, Vol.76(16), pp.6958-61
    Description: A palladium-catalyzed carbonation-diketonization reaction of terminal alkenes via carbon-nitrogen bond cleavage under an atmosphere of oxygen has been developed. A series of 1,2-diketones were readily prepared from the reaction of aromatic terminal alkenes with nitroalkanes.
    Keywords: Alkenes -- Chemical Properties ; Chemical Bonds -- Analysis ; Ketones -- Chemical Properties ; Palladium Catalysts -- Chemical Properties;
    ISSN: 00223263
    E-ISSN: 1520-6904
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  • 2
    Language: English
    In: Oecologia, 2013, Vol.171(1), pp.227-235
    Description: The effects of principal mechanisms (selection and complementarity) of biodiversity on ecosystem functionality have been well studied. However, it remains unknown how environmental conditions affect the relative strength of these two mechanisms. To answer this question, a controlled pot experiment was conducted in which species diversity was manipulated in low (natural soil) and high stress (mine tailing) plots, respectively. Our results demonstrate that the principal mechanism underlying the increasing biomass shifts from the selection to complementarity with increasing abiotic stress. The shift occurs because species interactions varied with increasing abiotic stress. Competition prevails in low stress plots, while facilitation dominates in high stress plots. In low stress plots, the monoculture biomass of a specific species is a good indicator of the competitive ability of that species in the mixture, and the dominant species significantly affects the plot biomass. In high stress plots, the tolerance indexes of all individual species increase with the manipulated species richness, providing clear evidence for the increasing role of facilitation.
    Keywords: Selection effect ; Complementarity effect ; Species interaction ; Abiotic stress ; Biomass
    ISSN: 0029-8549
    E-ISSN: 1432-1939
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  • 3
    Language: English
    In: Journal of the American College of Cardiology, 18 October 2016, Vol.68(16), pp.C36-C37
    Description: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.jacc.2016.07.135 Byline: Wang Jiang, Shanjun Zhu Author Affiliation: The Institute of Cardiovascular Disease of PLA, Xin Qiao Hospital, Third Military Medical University
    Keywords: Medicine
    ISSN: 0735-1097
    E-ISSN: 1558-3597
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  • 4
    Language: English
    In: Journal of Applied Psychology, 2015, Vol.100(4), pp.1249-1258
    Description: Organizational justice has been shown to play an important role in employees’ affective and performance outcomes particularly in uncertain contexts. In this study, we investigated the interaction effect of job insecurity and organizational justice on employees’ performance, and examined the mediating role of work engagement from the perspective of uncertainty management theory. We used 2-wave data (Study 1) from a sample of 140 Chinese employees and 3-wave data (Study 2) from a sample of 125 Chinese employees to test our hypotheses. In Study 1, we found that when employees perceived low levels of organizational justice, job insecurity was significantly negatively related to job performance. In contrast, we found that job insecurity was not related to job performance when there were high levels of organizational justice. Study 2 again supported the interaction of job insecurity and organizational justice on job performance. Furthermore, it was found that work engagement mediated the interaction effect. The results of the mediated moderation analysis revealed that job insecurity was negatively associated with job performance through work engagement when organizational justice was low.
    Keywords: Job Insecurity ; Job Performance ; Organizational Justice ; Work Engagement ; Uncertainty Management
    ISSN: 0021-9010
    E-ISSN: 1939-1854
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  • 5
    Language: English
    In: Bioorganic & Medicinal Chemistry, 01 December 2013, Vol.21(23), pp.7418-7429
    Description: A novel series of pyrrolidine-2-carbonitrile and 4-fluoropyrrolidine-2-carbonitrile derivatives was designed, synthesized, and found to act as dipeptidyl peptidase-4 (DPP-4) inhibitors. From this series of compounds, compound was identified as an efficacious, safe, and selective inhibitor of DPP-4. In vivo studies in ICR and KKAy mice showed that administration of this compound resulted in decreased blood glucose in these mice after an oral glucose challenge. Compound showed high DPP-4 inhibitory activity (IC = 0.017 μM), moderate selectivity against DPP-4 (selective ratio: DPP-8/DPP-4 = 1324; DPP-9/DPP-4 = 1164), and good efficacy in oral glucose tolerance tests in ICR and KKAy mice. These in vivo anti-diabetic properties and its desirable pharmacokinetic profile in Sprague–Dawley rats demonstrate that compound is a promising candidate for development as an anti-diabetic agent.
    Keywords: Pyrrolidine-2-Carbonitrile ; 4-Fluoropyrrolidine-2-Carbonitrile ; Dipeptidyl Peptidase-4 Inhibitor ; Oral Glucose Tolerance Test ; Type 2 Diabetes ; Medicine ; Chemistry ; Anatomy & Physiology
    ISSN: 0968-0896
    E-ISSN: 1464-3391
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  • 6
    Language: English
    In: Journal of the American Chemical Society, 03 August 2011, Vol.133(30), pp.11757-65
    Description: A novel catalytic asymmetric Michael addition of azomethine ylide with β-substituted alkylidene bisphosphates was realized in the presence of a chiral copper(I)/TF-BiphamPhos complex. The present system provides a unique and facile access to enantioenriched unnatural α-amino acid derivatives containing gem-bisphosphonates (gem-BPs) in high yields with excellent diastereoselectivities and enantioselectivities. Subsequent transformations lead to the expedient preparation of biologically active unnatural α-amino acid derivatives containing BPs and bisphosphonic acids without loss of diastereo- and enantiomeric excess.
    Keywords: Amino Acids -- Chemical Synthesis ; Coordination Complexes -- Chemistry ; Copper -- Chemistry ; Organometallic Compounds -- Chemistry ; Organophosphonates -- Chemistry
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 7
    Language: English
    In: Journal of the American Chemical Society, 19 August 2015, Vol.137(32), pp.10124-7
    Description: An unprecedented cascade vinylogous Mukaiyama 1,6-MA/MA of 2-silyloxyfurans and azoalkenes was realized with a Cu(II)/(t)Bu-Box complex. An array of fused butyrolactones containing multiple stereocenters was generally obtained in good yield (up to 90% yield) with exclusive diastereoselectivity (〉20:1 dr) and excellent enantioselectivity (up to 99% ee). Carbon isotope effects measured by (13)C NMR revealed a stepwise mechanism for this annulation process.
    Keywords: Lactones -- Chemical Synthesis
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 8
    Language: English
    In: Journal of the American Chemical Society, 18 June 2014, Vol.136(24), pp.8685-92
    Description: Conjugated cyclic trienes without nonbenzenoid aromatic characteristic were successfully employed as fine-tunable dipolarophiles in the Cu(I)-catalyzed asymmetric azomethine ylide-involved 1,3-dipolar [3 + 6] cycloaddition for the first time, affording a variety of bridged heterocycles bearing piperidine moiety in good yield with exclusive regioselectivity and excellent stereoselectivity. 2-Acyl group is the key factor that determines the annulation preferentially through [3 + 6]-pathway, while 2-ester group modulates the annulation through [3 + 2]-pathway.
    Keywords: Azo Compounds -- Chemical Synthesis ; Cycloheptanes -- Chemical Synthesis ; Heterocyclic Compounds -- Chemical Synthesis ; Organometallic Compounds -- Chemistry ; Piperidines -- Chemistry ; Thiosemicarbazones -- Chemical Synthesis
    ISSN: 00027863
    E-ISSN: 1520-5126
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  • 9
    In: Critical Care Medicine, 2015, Vol.43(11), pp.2520-2522
    Keywords: Acute Lung Injury -- Drug Therapy ; Bradykinin -- Antagonists & Inhibitors ; Cytokines -- Metabolism ; Dexamethasone -- Therapeutic Use ; Macrophages -- Drug Effects;
    ISSN: 0090-3493
    E-ISSN: 15300293
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  • 10
    Language: English
    In: Chemistry – A European Journal, 02 November 2017, Vol.23(61), pp.15396-15403
    Description: We herein report a visible‐light‐mediated heterogeneous [4+2] annulation of ‐cyclobutylanilines with alkynes catalyzed by self‐doped Ti@TiO. The self‐doped Ti@TiO is stable under photooxidation conditions, easy to recycle, and can be used multiple times without appreciable loss of activity. Extensive mechanistic studies suggest that the annulation reaction is mediated by singlet oxygen, which is generated through the photosensitization of oxygen in the air by the self‐doped Ti@TiO. In contrast, the homogeneous variant catalyzed by a far more expensive iridium complex proceeds under an inert atmosphere, which indicates a different mechanism. The substrate scopes of the two processes are comparable. : Self‐doped Ti@TiO has been shown to be a visible‐light‐active and easily recyclable photocatalyst for [4+2] annulation of ‐cyclobutylanilines with alkynes. Mechanistic studies reveal that upon visible light irradiation, self‐doped Ti@TiO sensitizes oxygen in the air to singlet oxygen, which subsequently mediates the [4+2] annulation reaction.
    Keywords: Annulation ; Cyclobutylaniline ; Photocatalysis ; Singlet Oxygen ; Titanium ; Visible Light
    ISSN: 0947-6539
    E-ISSN: 1521-3765
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