检索结果-南通市图书馆

Asymmetric Michael addition reactions catalyzed by a novel upper-rim functionalized calix[4]squaramide organocatalyst

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2020年第12期31卷 3259-3262页

作者： Ke Yang Zhiyan Ma Hong-xiao Tong xiao-Qiang Sun xiao-yu hu Zheng-Yi Li Jingsu Key Laboratory of Advanced Catalytic Materials&Technology School of Petrochemical EnginerngChangzhou LniversityChangzhou 213184China College of Material Science and Technology Nanjing University of Aeronatutics and AstronauricsNanjing 211100China

A novel upper-rim functionalized calix[4]squaramide organocatalyst bearing bis-squaramide and cyclohexanediamine scaffolds was designed and prepared to catalyse a serial of asymmetric Michael addition of 1,3-dicarbo nyl compounds to a,β-unsaturated carbonyl compounds in high yields(up to 99%)and good to excellent enantiomeric excesses(up to 99%ee).The comparative experiments indicated that the cooperative effect between calixarenes cavitives and chiral catalytic centers on this calix[4]squaramide catalyst could promote these ***,this strategy also provides valuable and easy access to chiral chromene,naphthoquinone and acetylacetone derivatives,which are important skeletons in biological and pharmaceutical compounds.

关键词： Calixsquaramide Supramolecular catalyst Asymmetric catalysis Michael addition Organic synthesis

Stable pillar[5]arene-based pseudo[1]rotaxanes formed in polar solution

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2016年第11期27卷 1655-1660页

作者： Xuan Wu Lei Gao Junzhao Sun xiao-yu hu Leyong Wang Key Laboratory of Mesoscopic Chemistry of MOE and Collaborative Innovation Center of Chemistry for Life Sciences School of Chemistry and Chemical EngineeringNanjing University

Mono-alkyl-functionalized pillar[5]arenes PI, P2, and P3 were synthesized by click reaction, which exhibited different self-assembly behavior in polar solvent DMSO. Stable pseudo[ 1 ]rotaxane was formed by the self-complexation from P1 or P2, whereas, concentration-dependent pseudorotaxane structures were generated by P3 which bearing more flexible side chain. Interestingly, the obtained pseudo[1]rotaxanes exhibited a dynamic fast assembly process upon adding NaBF4, resulting in the formation of Na＋-induced pseudorotaxanes.

关键词： Pillararene Pseudo[1 ]rotaxanes Dynamic self-assembly Na+-induced pseudorotaxanes Polar solution

Gutuo Jiejiu decoction improves survival of patients with severe alcoholic hepatitis: A retrospective cohort study

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第16期23卷 2957-2963页

作者： Hong-yuan Mou Hong-Ming Nie xiao-yu hu Department of Infectious Diseases School of Clinical Medicine Teaching Hospital of Chengdu University of Traditional Chinese Medicine Department of Liver Diseases Shuguang Hospital Shanghai University of Traditional Chinese Medicine

AIM To verify the value of Gutuo Jiejiu decoction in improving the survival of patients with severe alcoholic hepatitis(SAH).METHODS We performed a retrospective cohort study in consecutive patients diagnosed with SAH at the Teaching Hospital of Chengdu University of Traditional Chinese Medicine and Shuguang Hospital, Shanghai University of Traditional Chinese Medicine. The traditional Chinese medicine formula Gutuo Jiejiu decoction was employed as an exposure factor. Patients from the Teaching Hospital of Chengdu University of Traditional Chinese Medicine who had been treated with Gutuo Jiejiu decoction + prednisone were assigned to an observation group, and patients from Shuguang Hospital, Shanghai University of Traditional Chinese Medicine who had been treated with prednisone alone were selected as a control group. A retrospective analysis was performed by comparing age, alcohol intake, and clinical parameters of liver injury beforeand after treatment. Additionally, the 3-and 12-mo survival rates and the occurrence of complications were *** One hundred and twenty-eight eligible patients were selected from 175 cases with SAH, of which 68 were assigned to the observation group and the other 60 to the control group. No significant difference was found in the patients' baseline characteristics(P > 0.05). However, significant improvements of 90-d survival rate [56/68(82.4%) vs 27/60(45.0%), P = 0.0000] and 365-d survival rate [48/68(70.6%) vs 13/60(21.7%), P = 00000] were observed in the observation group after treatment. After the first 3 mo of treatment, more improvements in the clinical parameters and scoring systems related to liver injury occurred in the observation group than in the control group(P < 0.05). After treatment for 12 mo, the differences in the clinical parameters and scoring systems related to liver injury between the two groups were more significant(P < 0.05). No significant differences in complications and adverse effects were found b

关键词： Severe alcoholic hepatitis Survival rate Prednisone Traditional Chinese medicine therapy Retrospective study

Pillar[5]arene-modified peptide-guanidiniocarbonylpyrrol amphiphiles with gene transfection properties

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第5期34卷 246-249页

作者： Kaiya Wang Minzan Zuo Tao Zhang huilan yue xiao-yu hu College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China Qinghai Provincial Key Laboratory of Tibetan Medicine Research and Key Laboratory of Tibetan Medicine Research Northwest Institute of Plateau BiologyChinese Academy of SciencesXining 810008China

Pillar[5]arene-modified amphiphilic peptides with varying numbers of guanidiniocarbonylpyrrol(GCP)moieties have been successfully synthesized,which can self-assemble to multivalent cationic superstructures in aqueous *** assembled peptides can condense DNA into various compact multimolecular aggregates to achieve successful intracellular DNA delivery and demonstrate great potential for gene *** efficiencies of the self-assembled superstructures have been evaluated in vitro with He La and HEK 293T *** demonstrate that GCP moiety could enhance the cell transfection ability,owing to its excellent binding towards *** was also found that subtle structure difference in peptides 2 and 3 could result in distinct transfection efficacy,which makes it possible to gain an in-depth understanding of their structure-activity *** work presents a good example of rational structural design in achieving effective gene transfection vectors.

关键词： Pillararene Guanidinocarbonylpyrrole Gene transfection Amphiphiles Structure-activity relationship

The construction of aggregation-induced charge transfer emission systems in aqueous solution directed by supramolecular strategy

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第4期33卷 1975-1978页

作者： Weirui Qian Minzan Zuo Pengbo Niu xiao-yu hu Leyong Wang Key Laboratory of Mesoscopic Chemistry of MOE Jiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China Department of Chemistry Xihua UniversityChengdu 610039China

Novel aggregation-induced charge transfer(CT) emission systems with long luminescence lifetime directed by supramolecular strategy have been successfully developed in water. The dimethylacridine-based electron donor(Br Ac) with excellent aggregation ability can co-aggregate with a triazine-based electron acceptor(TRZ) to form nanorods in water, which exhibit CT emission with long lifetime(τ = 0.92 μs).As for a similar electron donor(Qa Ac) with poor aggregation ability, water-soluble pillar[5]arene(WP5)can be introduced to promote the aggregation process, leading to the obvious CT emission with long lifetime(τ = 0.61 μs). In addition, structural modification of the acceptor with substituent groups possessing stronger electron-accepting capabilities will cause red-shift(about 50 nm) of the emission, which allows conveniently constructing long lifetime organic luminescent materials with different emission colors.

关键词： Aggregation-induced charge transfer emission Supramolecular strategy Long luminescence lifetime Self-assemble Co-aggregate

Identifying priority protection areas of key food resources of the giant panda

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2023年第5期44卷 860-866页

作者： Ying-Jie Ma Meng Wang xiao-yu hu xiao-Dong Gu yu-Mei Li Fu-Wen Wei Yong-Gang Nie Key Laboratory of Animal Ecology and Conservation Biology Institute of ZoologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Xinjiang Key Laboratory of Biological Resources and Genetic Engineering College of Life Science and TechnologyXinjiang UniversityUrumqiXinjiang 830017China Sichuan Giant Panda National Park Administration ChengduSichuan 610081China Center for Evolution and Conservation Biology Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)GuangzhouGuangdong 511458China

Animals that live in seasonal environments adjust their reproduction cycle to optimize seasonal forage *** pandas(Ailuropoda melanoleuca)are seasonal altitudinal migrants that feed on bamboo shoots and leaves with different nutritional ***,the importance of bamboo shoots to giant pandas,especially small and isolated populations,is not fully ***,we explored whether mating time of giant pandas is shaped by bamboo shoot *** also assessed the intensity of ongoing bamboo shoot harvesting by local communities in 42 giant panda reserves based on questionnaire *** intensity and protection levels of bamboo shoot harvesting were *** these data,we developed a priority ranking scheme of protection areas for this key food *** study showed that pandas time their mating behavior to coincide with bamboo shoot phenology due to the high nutritional demands associated with mating and *** also found that bamboo shoots were not well protected in many ***,Daxiangling,and xiaoxiangling,containing the most isolated panda populations,were identified as the areas with the most urgent need of ***,equal attention should be paid to the Qiong L-B population,as this region holds considerable potential to serve as a corridor between the Minshan and Qionglai *** address the challenges posed by bamboo shoot harvesting,we recommend establishing more practical bamboo shoot management policies,increasing public awareness of bamboo shoot protection,and providing alternative sources of income for local communities.

关键词： Giant panda Forage quality Bamboo shoot harvesting Reproduction timing Conservation management

Controllable Fabrication of Various Supramolecular Nanostructures Based on Nonamphiphilic Azobenzene Derivatives and Pillar[6]arene

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2015年第1期33卷 107-111页

作者： Shan Qin Shuhan Xiong Yang Han xiao-yu hu Leyong Wang Key Laboratory of Mesoscopic Chemistry of MOE Center for Multimolecular Organic ChemistrySchool of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu 210093China

Various novel types of supramolecular nanostructures formed by nonamphiphilic azobenzene derivatives,G1 or G2 have been successfully fabricated,where G2 is structurally similar with G1 but an extra phenoxy group is con-nected with the azobenzene *** structures can be obtained from the self-assembly of G1,which further transform to large-sized spindle structures;while nanorods can be initially formed by G2,which will gradually ag-gregate to form layered structures with much larger ***,it is found that upon addition of WP6,which can form inclusion-complex with G1 or G2,separately,the nonamphiphilic G1 and G2 thus converse to supramolecular amphiphiles WP6⊃G1 and WP6⊃G2,***,both of the above WP6⊃G1 and WP6⊃G2 complexes can further assemble to form supramolecular binary vesicles,which will gradually transform to nanotubes(WP6⊃G1)or well-ordered nanosheets(WP6⊃G2).

关键词： nanostructure azobenzene derivatives pillararene self-assembly UV-responsiveness

State-of-the-art and recent progress in resorcinarene-based cavitand

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第10期34卷 27-34页

作者： Kaiya Wang Qian Liu Li Zhou Hao Sun xiaoquan Yao xiao-yu hu College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 211106China

Compartmentalization in the biological world brings excellent efficiency and specificity to the formation of complex compounds,inspiring supramolecular chemists to continuously search for defined spaces that can mimic such natural binding ***-shaped cavitands built up from resorcinarenes(RA)present rigid and preorganized concave surfaces,which are capable of mimicking the molecular recognition properties of *** versatile scaffold of RA endows the cavitand with terrific variety and excellent binding *** review provides a comprehensive overview over the structural modification to date in the high attention field of RA-based cavitands *** strategies for synthesizing diverse cavitands,such as small cavity cavitands,wider cavity cavitands,deep cavity cavitands,biscavitands,and asymmetric cavitands,are discussed in ***,insights into their applications including catalysis,separations and sensing are provided.

关键词： Resorcinarene Cavitand Supramolecular chemistry Host-guest chemistry Molecular recognition

A pillar[5]arene-based side-chain pseudorotaxanes and polypseudorotaxanes as novel fluorescent sensors for the selective detection of halogen ions

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2013年第11期24卷 987-992页

作者： Shu Sun Jian-Bing Shi yu-Ping Dong Chen Lin xiao-yu hu Le-Yong Wang School of Materials Science and Engineering Beijing Institute of Technology Key Laboratory of Mesoscopic Chemistry of MOE Center for Multimolecular Chemistry School of Chemistry and Chemical Engineering Nanjing University

A pseudorotaxane and its polypseudorotaxanes formed between pillar[5]arene moieties and noctylpyrazinium cations as novel fluorescent sensors for the selective detection of halogen ions were reported.A collapse of these pillar[5]arene-based pseudorotaxanes and polypseudorotaxanes occurred upon the addition of Cl,Br,and I（tetrabutylammonium salts）,respectively,leading to their fluorescence *** fluorescence enhancement of the pseudorotaxane and the polypseudorotaxanes increases in the order of I

关键词： Pillararene Polypseudorotaxanes Fluorescent sensor Halogen ions detection