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[Analysis of healthy life expectancy and related socioeconomic influencing factors among the middle-aged and elderly in China, the United States, and the European Union]. ZHONGHUA LIU XING BING XUE ZA ZHI = ZHONGHUA LIUXINGBINGXUE ZAZHI 2023; 44:1006-1012. [PMID: 37380426 DOI: 10.3760/cma.j.cn112338-20221031-00924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/30/2023]
Abstract
Objective: To calculate and compare the healthy life expectancy (HLE) of the middle-aged and elderly in China, the United States, and developing and developed countries in the European Union(EU) and analyze the impact of socioeconomic factors on HLE in different countries or regions. Methods: Four surveys from 2010 to 2019 were brought into the research. The data were collected from the China Health and Retirement Longitudinal Study, Health and Retirement Study, and the Survey of Health, Ageing and Retirement in Europe. Developed and developing countries in the EU were divided into two groups for calculation. Education level, total family wealth, and work retirement status were selected to measure socioeconomic status, and activities of daily living were used as health status indicators. We used the multi-state life cycle table method to calculate the transition probability between different health states and estimate life expectancy and HLE. Results: A total of 69 544 samples were included in the study. In terms of age, the middle-aged and elderly in the United States and developed countries of the EU have higher HLE in all age groups. In terms of gender, only Chinese women have lower HLE than men. Regarding socioeconomic factors, the middle-aged and elderly with higher education levels and total family wealth level have higher HLE. In China, working seniors have higher HLE, while for USA women and developed countries of the EU, retired or unemployed seniors have higher HLE. Conclusions: Demographic and socioeconomic factors impact HLE in different countries or regions. China should pay more attention to the health of women and the middle-aged and elderly retired with lower education and less total family wealth.
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Impact of the COVID-19 pandemic on cancer care. Hong Kong Med J 2022; 28:427-429. [PMID: 36523118 DOI: 10.12809/hkmj215136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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Pd-Catalyzed Enantioselective Tandem C–C Bond Activation/Cacchi Reaction between Cyclobutanones and o-Ethynylanilines. Org Lett 2021; 23:1309-1314. [DOI: 10.1021/acs.orglett.0c04297] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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[Reliability and validity of Stanford Presenteeism Scale (SPS-6) in Chinese occupational population]. ZHONGHUA LAO DONG WEI SHENG ZHI YE BING ZA ZHI = ZHONGHUA LAODONG WEISHENG ZHIYEBING ZAZHI = CHINESE JOURNAL OF INDUSTRIAL HYGIENE AND OCCUPATIONAL DISEASES 2021; 38:898-902. [PMID: 33406547 DOI: 10.3760/cma.j.cn121094-20191114-00529] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the reliability and validity of Stanford attendance scale (sps-6) in the study of attendance among professional groups. Methods: In August, 2018, the 1455 employees from 81 workplaces in Beijing, Shanghai, Jiangsu and Guangdong were randomly investigated as the subjects. The reliability and validity of sps-6 were analyzed by using the internal consistency reliability (Cronbach's coefficient) , half split half coefficient, content validity, integration validity, discrimination validity, cluster analysis and structural validity analysis. Results: Cronbach's coefficients of sps-6 scale, working process and work results were 0.692, 0.918 and 0.907, respectively; Guttman of scales and dimensions The split half coefficients were 0.792, 0.803 and 0.794, respectively; Pearson correlation coefficients of the total score of each item and scale were 0.526-0.673 (P<0.01) ; the qualification rate of set validity and differentiation validity were 100%; the results of cluster analysis supported the theoretical basis for the formation of the scale. The general non-standard fitting index (TLI) =0.982, approximate error mean square root mean square (RMSEA) =0.071, comparative fit index (CFI) =0.990, fit goodness index (GFI) =0.987, modified fit goodness index (AGFI) =0.965, Norm fit index (NFI) =0.990. The results showed that the scale had higher structural validity, and the results of sps-6 in the occupational population were (21.36±4.04) , and the distribution was normal (deviation was 0.053, peak was 0.023) . The scores of sps-6 scale were statistically different in various charactoristics of gender, age, education level, marital status, annual income, position, position level and industry (P< 0.01) . Conclusion: Stanford attendance scale has high reliability and validity, and can be applied to the study of attendance in professional groups.
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[Research on equity and influencing factors of disability among Chinese middle-aged and old people]. JOURNAL OF PEKING UNIVERSITY. HEALTH SCIENCES 2020; 52:500-505. [PMID: 32541984 DOI: 10.19723/j.issn.1671-167x.2020.03.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
OBJECTIVE To evaluate disability status and equity of the middle-aged and old population in China, and to explore the influencing factors contributing to the inequity of disability. METHODS This study was based on data collected from the first wave survey (2007-2010) of World Health Organization Study on Global Ageing and Adult Health (SAGE). Concentration index (CI) and concentration curve were calculated to measure the economic-related inequity of disability among the Chinese middle-aged and old people. The CI was further decomposed in which the attributions of social and individual determinants were calculated. RESULTS The mean score of the World Health Organization Disability Assessment Sche-dule (WHODAS) was 7.32 among the Chinese middle-aged and old people, 6.37 for males and 8.21 for females. The CI for the whole participants was -0.190 9, compared with -0.184 4 for the middle-aged and old men and -0.196 1 for the women. After decomposition of the CI, socioeconomic status contributed most to disability inequity among the Chinese middle-aged and old population. Financial status, educational level and work type contributed 66.41%, 16.45% and 13.10% respectively to inequity of disability. Individual lifestyle factors, including tobacco use, alcohol consumption and physical activities, contributed less to inequity of disability compared with social structural determinants. CONCLUSION There was inequity of disability among Chinese middle-aged and old population, and those with better financial status were less likely to suffer from functional disability. Middle-aged and old males were less disabled than females, and had less inequity of disability. Financial status, educational level and work type took the highest contribution to inequity of disability among Chinese middle-aged and old population, suggesting that promoting healthy lifestyles alone cannot effectively reduce the inequity of disability. The government needs to continually strengthen and improve appropriate social and medical protection measures on the basis of the importance it attaches to the health of the middle-aged and old population, and makes reducing health inequities a policy priority. The government should pay attention to the provision of healthcare and other resources in areas where development is relatively lagging and where there is a relative concentration of middle-aged and old population. Meanwhile, there should be more significant support for research on health status and equity among the middle-aged and old population to obtain more evidence for proactive responses to rapid population aging in China and policy development.
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[COVID-19 pandemic: global epidemiological trends and China's subsequent preparedness and responses]. ZHONGHUA LIU XING BING XUE ZA ZHI = ZHONGHUA LIUXINGBINGXUE ZAZHI 2020; 41:642-647. [PMID: 32164401 DOI: 10.3760/cma.j.cn112338-20200301-00222] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The outbreak of COVID-19 has spread quickly across 114 countries/territories/areas in six continents worldwide and has been announced as a pandemic by WHO. This study analyzed global COVID-19 epidemiological trends, examined impact of the pandemic on global health security, diplomacy, and social environment in China, and provided short- and long-term strategic policy recommendations for China's subsequent preparedness and responses.
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Copper-catalyzed enantioselective desymmetrization of prochiral tetrasubstituted siladiols: Access toward optically active silicon-stereogenic silylmethanols. CATAL COMMUN 2020. [DOI: 10.1016/j.catcom.2020.105950] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
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[Clinical effect of bi-layered artificial dermis and autologous skin graft in repairing bone and/or tendon exposed wounds]. ZHONGHUA SHAO SHANG ZA ZHI = ZHONGHUA SHAOSHANG ZAZHI = CHINESE JOURNAL OF BURNS 2020; 36:179-186. [PMID: 32241043 DOI: 10.3760/cma.j.cn501120-20191119-00437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To explore the clinical effect of bi-layered artificial dermis combined with autologous skin graft in the repair of wounds with exposed bone and/or tendon. Methods: The medical records of 25 patients (aged 3 to 79 years, including 21 males and 4 females) with bone and/or tendon exposed wounds caused by various reasons, admitted to Nanfang Hospital of Southern Medical University from May 2014 to December 2018 were analyzed retrospectively. Of the 25 patients, 7 patients had exposed bone only, 13 patients had exposed tendon only, and 5 patients had exposure of both bone and tendon. The total wound area was 78.0 (53.4, 103.2) cm(2). The widths of bone exposure and tendon exposure were 3.2 (3.0, 3.6) cm and 2.0 (1.7, 2.4) cm, respectively. All wounds were implanted with bi-layered artificial dermis in the first stage after thorough wound debridement. After 2 to 3 weeks of vascularization of artificial dermis, autologous thin-to-medium-thickness skins or split-thickness skins were grafted to repair the wounds in the second stage. The vascularization of artificial dermis and its time, whether or not producing hematoma, the skin graft survival rate on day 7 post autologous skin grafting, whether or not repeating skin grafting, and the time of complete wound healing were observed and recorded. The patients were further followed up and observed for 3 or more months after discharge. Results: The vascularization of artificial dermis was achieved in 24 patients after the first transplantation with vascularization time being 11-21 (16±4) days. No hematoma was observed in the transplanted artificial dermis. Failed vascularization of grafted artificial dermis was observed in one patient who was later treated with negative pressure drainage and skin grafting alone, and was discharged with wound healing. The skin graft survival rate on day 7 post autologous skin grafting was 92.2%-100.0% ( (99.3±1.3)%), with the remaining wound areas recovered later by themselves or healed by dressing changes without repeated skin grafting. The complete wound healing time was 7-19 (11.9±2.8) days after autologous skin grafting. The patients were followed up for 3 to 60 months after discharge. Except for the pigmentation in skin graft area, the skin grafts survived well, being soft in texture and with no repeated ulceration, obvious hypertrophic scar, or contracture deformity. Conclusions: Artificial dermis combined with autologous skin grafting can effectively repair wounds with bone and/or tendon exposure, providing a repair strategy for this type of wounds.
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Controllable Si-C Bond Activation Enables Stereocontrol in the Palladium-Catalyzed [4+2] Annulation of Cyclopropenes with Benzosilacyclobutanes. Angew Chem Int Ed Engl 2019; 59:790-797. [PMID: 31829499 DOI: 10.1002/anie.201913060] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Indexed: 12/15/2022]
Abstract
A novel and unusual palladium-catalyzed [4+2] annulation of cyclopropenes with benzosilacyclobutanes is reported. This reaction occurred through chemoselective Si-C(sp2 ) bond activation in synergy with ring expansion/insertion of cyclopropenes to form new C(sp2 )-C(sp3 ) and Si-C(sp3 ) bonds. An array of previously elusive bicyclic skeleton with high strain, silabicyclo[4.1.0]heptanes, were formed in good yields with excellent diastereoselectivity under mild conditions. An asymmetric version of the reaction with a chiral phosphoramidite ligand furnished a variety of chiral bicyclic silaheterocycle derivatives with good enantioselectivity (up to 95.5:4.5 er). Owing to the mild reaction conditions, the good stereoselectivity profile, and the ready availability of the functionalized precursors, this process constitutes a useful and straightforward strategy for the synthesis of densely functionalized silacycles.
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Highly expressed lncRNA FAL1 promotes the progression of gastric cancer by inhibiting PTEN. EUROPEAN REVIEW FOR MEDICAL AND PHARMACOLOGICAL SCIENCES 2019; 22:8257-8264. [PMID: 30556865 DOI: 10.26355/eurrev_201812_16520] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE The aim of this study was to investigate the function of FAL1 in gastric cancer (GC) development and to examine its underlying mechanism. Our study might provide a theoretical basis for developing novel diagnostic markers for GC. PATIENTS AND METHODS FAL1 expression in GC tissues and adjacent tissues was detected by quantitative Real Time-Polymerase Chain Reaction (qRT-PCR). The serum level of FAL1 in GC patients with different pathological grades was further detected. The effects of FAL1 on cell proliferation and cell cycle were detected by cell counting kit-8 (CCK-8) assay and flow cytometry, respectively. Meanwhile, Western blot was used to detect the protein expression of PTEN after FAL1 overexpression or knockdown in GC cells. In addition, rescue experiments were conducted to verify the regulatory effect of FAL1 on PTEN. RESULTS QRT-PCR results showed that the expression of FAL1 in GC tissues was remarkably higher than that of adjacent tissues. FAL1 expression was correlated with pathological grades of GC patients. Meanwhile, FAL1 overexpression promoted the proliferation and cell cycle of BGC-823 and MGC-803 cells. Western blot analysis demonstrated that FAL1 could inhibit the protein expression of PTEN in GC cells. In addition, rescue experiments indicated that the overexpression of PTEN could partially reverse the effect of FAL1 on the proliferation and cell cycle of BGC-823 and MGC-803 cells. CONCLUSIONS The overexpression of FAL1 can promote cell proliferation and cell cycle of GC via inhibiting PTEN.
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PdCl 2(CH 3CN) 2-catalyzed regioselective C-H olefinations of 2-amino biaryls with vinylsilanes as unactivated alkenes. Chem Commun (Camb) 2019; 55:6229-6232. [PMID: 31086887 DOI: 10.1039/c9cc02199j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first example of palladium-catalyzed chelation-assisted C-H olefination of 2-amino biaryls using readily available vinylsilanes as unactivated olefinating reagents has been developed, affording valuable arylated vinylsilane compounds in moderate to excellent yields and with exclusive (E)-selectivities.
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Enantioselective synthesis of axially chiral vinyl arenes through palladium-catalyzed C-H olefination. Chem Commun (Camb) 2018; 54:10706-10709. [PMID: 30182108 DOI: 10.1039/c8cc05555f] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A palladium-catalyzed ketoxime-chelation-assisted enantioselective C-H olefination of 2-arylcyclohex-2-enone oxime ether with a wide range of olefins as coupling partners was developed. Employing ketoxime ether as an efficient directing group, a variety of axially chiral vinyl arenes was synthesized by Pd(ii)-catalyzed C-H functionalization with excellent enantioselectivities (96 → 99% ee) under mild conditions.
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Front Cover Picture: Silicon-based Bulky Group−Tuned Parallel Kinetic Resolution in Copper-Catalyzed 1,3-Dipolar Additions (Adv. Synth. Catal. 16/2018). Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Construction of Six-Membered Silacyclic Skeletons via Platinum-Catalyzed Tandem Hydrosilylation/Cyclization with Dihydrosilanes. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800456] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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[Postoperative management of hypoplastic left heart syndrome after Norwood stageⅠoperation]. ZHONGHUA ER KE ZA ZHI = CHINESE JOURNAL OF PEDIATRICS 2018; 56:468-469. [PMID: 29886615 DOI: 10.3760/cma.j.issn.0578-1310.2018.06.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
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Silicon-based Bulky Group−Tuned Parallel Kinetic Resolution in Copper-Catalyzed 1,3-Dipolar Additions. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800220] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Ligand-Controlled Inversion of Diastereo- and Enantioselectivity in Silver-Catalyzed Azomethine Ylide–Imine Cycloaddition of Glycine Aldimino Esters with Imines. Org Lett 2018; 20:2551-2554. [DOI: 10.1021/acs.orglett.8b00702] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Highly efficient desymmetrization of cyclopropenes to azabicyclo[3.1.0]hexanes with five continuous stereogenic centers by copper-catalyzed [3 + 2] cycloadditions. Org Chem Front 2018. [DOI: 10.1039/c8qo00761f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
An unprecedented copper-catalyzed desymmetrization/cycloaddition reaction of 1,1-disubstituted cyclopropenes provides an efficient access to azabicyclo[3.1.0]hexanes bearing five continuous carbon-stereogenic centers.
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Palladium-catalyzed tandem allylic substitution/cyclization and cascade hydrosilylated reduction: the influence of reaction parameters and hydrosilanes on the stereoselectivity. RSC Adv 2018; 8:22944-22951. [PMID: 35540169 PMCID: PMC9081657 DOI: 10.1039/c8ra02995d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Accepted: 06/12/2018] [Indexed: 12/31/2022] Open
Abstract
Pd-catalyzed AAA of 1,2-bifunctional nucleophiles and one-pot tandem allylic cyclization/reduction gave corresponding heterocycle products with promising enantioselectivity in good yields.
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Catalytic Asymmetric Huisgen Alkyne-Azide Cycloaddition of Bisalkynes by Copper(I) Nanoparticles. ChemCatChem 2017. [DOI: 10.1002/cctc.201701336] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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Palladium-Catalyzed Ring-Opening of 2-Alkylidenecyclobutanols: Stereoselective Synthesis of γ,δ-Unsaturated Ketones by C−C Bond Cleavage. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201701078] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Enantioselective Synthesis of Chiral Imidazolidine Derivatives by Asymmetric Silver/Xing-Phos-Catalyzed Homo-1,3-Dipolar [3+2] Cycloaddition of Azomethine Ylides. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700732] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Asymmetric Synthesis of Glutamic Acid Derivatives by Silver-Catalyzed Conjugate Addition–Elimination Reactions. Org Lett 2017; 19:4896-4899. [DOI: 10.1021/acs.orglett.7b02378] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Platinum-Catalyzed Multicomponent Alcoholysis/Hydrosilylation and Bis-hydrosilylation of Alkynes with Dihydrosilanes. ChemCatChem 2017. [DOI: 10.1002/cctc.201700390] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Mechanistic Insights into Palladium-Catalyzed Silylation of Aryl Iodides with Hydrosilanes through a DFT Study. Chem Asian J 2017; 12:1749-1757. [PMID: 28452198 DOI: 10.1002/asia.201700174] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 04/21/2017] [Indexed: 11/05/2022]
Abstract
The catalytic cycles of palladium-catalyzed silylation of aryl iodides, which are initiated by oxidative addition of hydrosilane or aryl iodide through three different mechanisms characterized by intermediates R3 Si-PdII -H (Cycle A), Ar-PdII -I (Cycle B), and PdIV (Cycle C), have been explored in detail by hybrid DFT. Calculations suggest that the chemical selectivity and reactivity of the reaction depend on the ligation state of the catalyst and specific reaction conditions, including feeding order of substrates and the presence of base. For less bulky biligated catalyst, Cycle C is energetically favored over Cycle A, through which the silylation process is slightly favored over the reduction process. Interestingly, for bulky monoligated catalyst, Cycle B is energetically more favored over generally accepted Cycle A, in which the silylation channel is slightly disfavored in comparison to that of the reduction channel. Moreover, the inclusion of base in this channel allows the silylated product become dominant. These findings offer a good explanation for the complex experimental observations. Designing a reaction process that allows the oxidative addition of palladium(0) complex to aryl iodide to occur prior to that with hydrosilane is thus suggested to improve the reactivity and chemoselectivity for the silylated product by encouraging the catalytic cycle to proceed through Cycles B (monoligated Pd0 catalyst) or C (biligated Pd0 catalyst), instead of Cycle A.
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Lewis-Base-Mediated Diastereoselective Silylations of Alcohols: Synthesis of Silicon-Stereogenic Dialkoxysilanes Controlled by Chiral Aryl BINMOLs. Chem Asian J 2017; 12:1730-1735. [DOI: 10.1002/asia.201700640] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Indexed: 11/10/2022]
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Iridium-Catalyzed Intramolecular C-H Silylation of Siloxane-Tethered Arene and Hydrosilane: Facile and Catalytic Synthesis of Cyclic Siloxanes. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700160] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Cs₂CO₃-Initiated Trifluoro-Methylation of Chalcones and Ketones for Practical Synthesis of Trifluoromethylated Tertiary Silyl Ethers. Molecules 2017; 22:molecules22050769. [PMID: 28524100 PMCID: PMC6154635 DOI: 10.3390/molecules22050769] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Revised: 04/17/2017] [Accepted: 05/05/2017] [Indexed: 12/11/2022] Open
Abstract
It was found that 1,2-trifluoromethylation reactions of ketones, enones, and aldehydes were easily accomplished using the Prakash reagent in the presence of catalytic amounts of cesium carbonate, which represents an experimentally convenient, atom-economic process for this anionic trifluoromethylation of non-enolisable aldehydes and ketones.
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Transition-metal-catalyzed transfer carbonylation with HCOOH or HCHO as non-gaseous C1 source. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.01.005] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Transition-Metal-Free Oxidative C(sp 2 )-H Hydroxylation of Terpyridines: A HOMO-Raising Strategy for the Construction of a New Super-Stable Terpyridine Chromophores. Chemistry 2017; 23:4055-4059. [PMID: 28181312 DOI: 10.1002/chem.201605793] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Indexed: 12/16/2022]
Abstract
Direct functionalization of terpyridines is an increasingly important topic in the field of dyes and catalysis as well as supramolecular chemistry, but its synthesis and transformation is usually challenging. Herein, a HOMO-raising strategy is reported for the construction of a super-stable novel terpyridine chromophores, in which the selective oxidation of terpyridines at its 3-position was determined successfully to the synthesis of phenol-functionalization of terpyridines (TPyOHs) bearing a hydrogen bonding group. The corresponding TPyOHs displayed strong aggregation-induced emission and exhibited highly selective and visual detection of ZnII cation with a record green terpyridine-based luminophore with nanomolar sensitivity (125 nm).
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Graphene-enhanced platinum-catalysed hydrosilylation of amides and chalcones: a sustainable strategy allocated with in situ heterogenization and multitask application of H 2PtCl 6. RSC Adv 2017. [DOI: 10.1039/c7ra10541j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This work developed a new sustainable strategy with comprehensive utilization of recovered catalyst, which the organosilicon/graphene-supported platinum catalyst prepared from reduction of amides could be further used in the 1,4-hydrosilylation of chalcones.
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Enantioselective synthesis of chiral acylsilanes by copper/HZNU-Phos-catalyzed asymmetric conjugate addition of diethyzinc to α,β-unsaturated acylsilanes. RSC Adv 2017. [DOI: 10.1039/c7ra11919d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The catalytic asymmetric copper-catalyzed conjugate addition of diethylzinc reagent to α,β-unsaturated acylsilanes was found to proceed smoothly in moderate to good yields and enantioselectivities (up to 85% ee) in the presence of the multifunctional HZNU-Phos.
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Association between polymorphisms in the promoter region of pri-miR-34b/c and risk of hepatocellular carcinoma. GENETICS AND MOLECULAR RESEARCH 2016; 15:gmr8723. [PMID: 27808368 DOI: 10.4238/gmr.15048723] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Hepatocellular carcinoma (HCC) is a major cause of cancer-related deaths worldwide. MicroRNA-34 (miR-34) gene plays a key role in altering the apoptotic cycle and pathways of downstream cells, and therefore influences carcinogenesis. In this case-control study, we assessed the role of the pri-miR-34b/c rs4938723 polymorphism in HCC risk. The pri-miR-34b/c polymorphic genotype was determined in 286 patients with HCC and 572 controls using polymerase chain reaction-restriction fragment length polymorphism. The male gender (X2 = 12.95, P < 0.001), regular alcohol consumption (X2 = 16.81, P < 0.001), and a family history of cancer (X2 = 11.88, P = 0.001) were associated with HCC risk. However, the age (t = 1.19, P = 0.12) and tobacco smoking habit (X2 = 0.64, P = 0.42) of HCC patients were comparable to those of the controls. The TC (adjusted OR = 1.46, 95%CI = 1.06-2.01) and CC (adjusted OR = 3.07, 95%CI = 1.77-5.34) genotypes of pri-miR-34b/c rs4938723 were correlated with a higher risk of HCC compared to the TT genotype. Moreover, the TC+CC genotype was correlated with an increased risk of HCC compared to the TT genotype (adjusted OR = 1.64, 95%CI = 1.21-2.22). In the recessive model, the CC genotype of pri-miR-34b/c rs4938723 was significantly correlated with an elevated risk of HCC compared to the TT+TC genotype (adjusted OR = 2.50, 95%CI = 1.49-4.22). Further large-scale and multi-center studies are required to confirm these results.
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Palladium-Catalyzed Desymmetrization of Silacyclobutanes with Alkynes to Silicon-Stereogenic Silanes: A Density Functional Theory Study. Chem Asian J 2016; 11:2867-2875. [PMID: 27325305 DOI: 10.1002/asia.201600709] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2016] [Revised: 06/18/2016] [Indexed: 12/20/2022]
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37
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PMHS-Containing Semi-Penetrating Networks as Multifunctional Hydrosilanes for Highly Efficient Palladium-Catalyzed Conjugate Reduction of Enones. ChemistrySelect 2016. [DOI: 10.1002/slct.201600667] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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38
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Asymmetric Michael Addition of Aldimino Esters with Chalcones Catalyzed by Silver/Xing-Phos: Mechanism-Oriented Divergent Synthesis of Chiral Pyrrolines. Chemistry 2016; 22:10399-404. [DOI: 10.1002/chem.201601945] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Indexed: 11/10/2022]
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39
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CH Functionalization/CO Bond Cleavage of Benzyl Silyl Ethers with Ynamides for the Chemoselective Synthesis of Skeletally Diverse Compounds. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500936] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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40
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Tao-Phos-controlled desymmetrization of succinimide-based bisalkynes via asymmetric copper-catalyzed Huisgen alkyne–azide click cycloaddition: substrate scope and mechanism. RSC Adv 2016. [DOI: 10.1039/c6ra13687g] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
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41
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Fei-Phos ligand-controlled asymmetric palladium-catalyzed allylic substitutions with structurally diverse nucleophiles: scope and limitations. RSC Adv 2016. [DOI: 10.1039/c6ra09657c] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
The asymmetric palladium-catalysed alkylation of structurally diverse nucleophiles, including alcohols, activated methylene compounds, indoles, and aromatic amines, led to the formation of corresponding products in good yields and high enantioselectivities (up to 99% ee).
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Palladium-catalyzed Si–C bond-forming silylation of aryl iodides with hydrosilanes: an enhanced enantioselective synthesis of silicon-stereogenic silanes by desymmetrization. RSC Adv 2016. [DOI: 10.1039/c6ra12873d] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
An enantioselective Pd-catalyzed silicon–carbon bond-forming silylation reaction of aryl iodides with hydrosilanes for the synthesis of silicon-stereogenic silanes has been developed with good enantioselectivity under mild conditions.
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43
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A mechanistic study on multifunctional Fei-Phos ligand-controlled asymmetric palladium-catalyzed allylic substitutions. RSC Adv 2016. [DOI: 10.1039/c6ra15665g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Mechanistic studies were performed for the clarification of the role of multifunctional Fei-Phos in allylic substitution reactions, in which it is proved to be a diphosphine-controlled catalytic asymmetric allylic alkylation.
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Catalytic asymmetric bromochlorination of aromatic allylic alcohols promoted by multifunctional Schiff base ligands. Org Biomol Chem 2016; 14:7927-32. [DOI: 10.1039/c6ob01306f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The aromatic bromochloroalcohols with two bromide/chloride-linked carbon-stereogenic centers were obtained in moderate to excellent regio- and enantioselectivities as well as good yields and chemoselectivities in the catalytic asymmetric bromochlorination of allylic alcohols.
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Lewis acid catalyzed [2+2] cycloaddition of ynamides and propargyl silyl ethers: synthesis of alkylidenecyclobutenones and their reactivity in ring-opening and ring expansion. Chem Commun (Camb) 2016; 52:9574-7. [DOI: 10.1039/c6cc04648g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A family of four-membered enones, polysubstituted alkylidenecyclobutenones, were easily prepared by the Lewis acid catalyzed formal [2+2] cycloaddition of ynamides and propargyl silyl ethers.
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46
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An efficient approach toward formation of polycyclic coumarin derivatives via carbocation-initiated [4+2] cycloaddition and atom-economical photo-irradiated cyclization. Chem Commun (Camb) 2016; 52:11131-4. [DOI: 10.1039/c6cc05698a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polycyclic coumarin derivatives were easily prepared by carbocation initiated [4+2] cycloaddition of propargyl silyl ethers with ynamides and fluorescent analysis-oriented photo-irradiated cyclization.
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Synthesis of bi- and bis-1,2,3-triazoles by copper-catalyzed Huisgen cycloaddition: A family of valuable products by click chemistry. Beilstein J Org Chem 2015; 11:2557-76. [PMID: 26734102 PMCID: PMC4685768 DOI: 10.3762/bjoc.11.276] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Accepted: 11/20/2015] [Indexed: 12/15/2022] Open
Abstract
The Cu(I)-catalyzed azide-alkyne cycloaddition reaction, also known as click chemistry, has become a useful tool for the facile formation of 1,2,3-triazoles. Specifically, the utility of this reaction has been demonstrated by the synthesis of structurally diverse bi- and bis-1,2,3-triazoles. The present review focuses on the synthesis of such bi- and bistriazoles and the importance of using copper-promoted click chemistry (CuAAC) for such transformations. In addition, the application of bitriazoles and the related CuAAAC reaction in different fields, including medicinal chemistry, coordination chemistry, biochemistry, and supramolecular chemistry, have been highlighted.
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Aromatic-Amide-Derived Nonbiaryl Atropisomer as Highly Efficient Ligand for Asymmetric Silver-Catalyzed [3 + 2] Cycloaddition. ACS Catal 2015. [DOI: 10.1021/acscatal.5b01685] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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49
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Association of TUSC3 gene polymorphisms with non-syndromic mental retardation based on nuclear families in the Qinba mountain area of China. GENETICS AND MOLECULAR RESEARCH 2015; 14:5022-30. [PMID: 25966277 DOI: 10.4238/2015.may.12.5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
TUSC3 interacts with the protein phosphatase 1 and magnesium ion transport system, which plays an important role in learning and memory. Abnormal conditions of learning and memory are common clinical characteristics of mental retardation (MR). However, the association of TUSC3 genetic polymorphisms with MR remains unknown. A total of 456 DNA samples including 174 nuclear families containing MR were collected in the Qinba mountain area of China. The genotypes of eight tag single nucleotide polymorphisms of TUSC3 were evaluated with traditional genetic methods. Family-based association tests, transmission disequilibrium tests (TDTs), and haplotype relative risk (HRR) analyses were performed to investigate the association between genetic variants of the TUSC3 gene and MR. The genetic polymorphisms rs10093881, rs6530893, and rs6994908 were associated with MR (all P values <0.05) based upon the results of single-site TDT and HRR analyses. The haplotype block consisting of rs6530893 and rs6994908, harboring the sixth exon of TUSC3, was also associated with MR (all P values <0.05). This study demonstrated an association between genetic polymorphisms of the TUSC3 gene and MR in the Qinba mountain area, the sixth exon of which might contribute to the risk of MR. However, further studies are needed on the causal mechanisms in this association.
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50
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Modular construction of multifunctional ligands for the enantioselective ruthenium-catalyzed carbenoid N–H insertion reaction: an enzyme-like and substrate-sensitive catalyst system. RSC Adv 2015. [DOI: 10.1039/c5ra05804j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
It was found for the first time that BINOL-derived multifunctional ligands bearing a silicon-based bulky group exhibited promising enantioselective control in the ruthenium-catalysed carbenoid N–H insertion reaction.
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