Dispersive liquid-liquid microextraction and gas chromatography-mass spectrometry determination of polychlorinated biphenyls and polybrominated diphenyl ethers in milk
作者：
Liu, Xiujuan;Zhao, Aijun;Zhang, Aina;Liu, Huanqiang;Xiao, Wenjing;...
期刊：
JOURNAL OF SEPARATION SCIENCE ,2011年34(9):1084-1090 ISSN：1615-9306
通讯作者：
Wang, Xuedong
作者机构：
[Zhao, Aijun; Liu, Xiujuan; Liu, Huanqiang; Zhang, Aina; Wang, Xuedong] Wenzhou Med Coll, Sch Environm Sci & Publ Hlth, Wenzhou, Peoples R China.;[Xiao, Wenjing; Liu, Xiujuan] Cent China Normal Univ, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan, Peoples R China.;[Wang, Chengjun] Wenzhou Univ, Chem & Mat Engn Coll, Wenzhou, Peoples R China.
通讯机构：
[Wang, Xuedong] W;Wenzhou Med Coll, Sch Environm Sci & Publ Hlth, Wenzhou, Peoples R China.
关键词：
GC-MS;Milk sample;Polybrominated diphenyl ethers (PBDEs);Polychlorinated biphenyls (PCBs);SPE combined with dispersive liquid-liquid microextraction
摘要：
An effective multi-residue pretreatment technique, solid-phase extraction (SPE) combined with dispersive liquid-liquid microextraction (DLLME), was proposed for the trace analysis of 14 polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) in milk samples using gas chromatography-mass spectrometry (GC-MS). Interesting analytes in milk samples were extracted with hexane after protein precipitation. The hexane extracts were loaded on an LC-Florisil column to isolate analytes from the milk matrix. The elutes were dried and dissolved in acetone, which was used as the disperser solvent in subsequent DLLME procedures. The effects of several important parameters on the extraction efficiency were evaluated. Under the optimized conditions, a linear relationship was obtained in the range of 0.02-10.00 μg/L (PCBs) and 0.5-100.00 μg/L (PBDEs). The LOD (S/N=3) and relative standard deviations (RSDs, n=5) for all analytes were 0.01-0.4 μg/L and 0.6-8.5%, respectively. The recoveries of the standards added to raw bovine milk samples were 74.0-131.8%, and the repeatabilities of the analysis results were 1.12-17.41%. This method has been successfully applied to estimating PCBs and PBDEs in milk samples. Copyright ©2011 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim.
语种：
英文
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Synthesis and biological activities of enantioriched 1 -Aryl-2-(1H-1,2,4- triazol-1-yl)ethanols
作者：
Xu Shengzhen* ;Ming Zhihui;Yang Jiaoyan;Yang Shao;Ding Mingwu;...
期刊：
有机化学 ,2010年30(2):285-288 ISSN：0253-2786
通讯作者：
Xu Shengzhen
作者机构：
[Xu Shengzhen; Ding Mingwu; Ming Zhihui; Xiao Wenjing] Cent China Normal Univ, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.;[Yang Shao; Yang Jiaoyan] Cent China Normal Univ, Coll Life Sci, Wuhan 430079, Peoples R China.
通讯机构：
[Xu Shengzhen] C;Cent China Normal Univ, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Peoples R China.
关键词：
***;手性;14α-脱甲基化酶;抑菌活性
摘要：
取代苯乙烯1与KHSO_5在手性催化剂2存在的条件下反应,生成1-芳基环氧化物3,3与1H-1,2,4.***在固体碳酸钾催化下作用,得到手性的1-芳基-2-(1H-1,2,4-***-1-基)乙醇衍生物4.部分4对甾醇14α-脱甲基化酶表现出强结合作用.
语种：
中文
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Enantioselective Conjugate Addition of Oximes to Trisubstituted beta-Nitroacrylates: An Organocatalytic Approach to beta(2,2)-Amino Acid Derivatives
作者：
Zhang, Fu-Gen;Yang, Qing-Qing;Xuan, Jun;Lu, Hai-Hua;Duan, Shu-Wen;...
期刊：
Organic Letters ,2010年12(24):5636-5639 ISSN：1523-7060
通讯作者：
Chen, Jia-Rong
作者机构：
[Yang, Qing-Qing; Duan, Shu-Wen; Xiao, Wen-Jing; Lu, Hai-Hua; Chen, Jia-Rong; Xuan, Jun; Zhang, Fu-Gen] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.;[Chen, Jia-Rong] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Chen, Jia-Rong] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
摘要：
A highly enantioselective organocatalytic intermolecular conjugate addition of oximes to β-nitroacrylates has been developed. The highly functionalized adducts obtained are valuable precursors for asymmetric synthesis, as demonstrated by the synthesis of β2,2-amino acids and oxazolidin-2-ones. © 2010 American Chemical Society.
语种：
英文
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Highly efficient route to functionalized tetrahydrocarbazoles using a tandem cross-metathesis/intramolecular-hydroarylation sequence
作者：
An, Xiao-Lei* ;Chen, Jia-Rong;Li, Chang-Feng;Zhang, Fu-Gen;Zou, You-Quan;...
期刊：
CHEMISTRY-AN ASIAN JOURNAL ,2010年5(10):2258-2265 ISSN：1861-4728
通讯作者：
An, Xiao-Lei
作者机构：
[Guo, Ying-Cen; Xiao, Wen-Jing; Chen, Jia-Rong; An, Xiao-Lei; Li, Chang-Feng; Zhang, Fu-Gen; Zou, You-Quan] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Hubei, Peoples R China.;[An, Xiao-Lei] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[An, Xiao-Lei] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
关键词：
enantioselectivity;heterocycles;metathesis;ruthenium;synthesis design
摘要：
The scope of the novel ruthenium-catalyzed tandem cross-metathesis/ intramolecular-hydroarylation sequence is described. This methodology offers a practical and efficient synthesis of structurally diverse and complex tetrahydrocarbazoles in good to excellent yields (up to 98%). Moreover, preliminary efforts towards the development of an enantioselective version of the current process by sequential catalysis with ruthenium complex and chiral amine are presented, with high yields and enantioselectivities (up to 88% yield and 91% ee). © 2010 Wiley-VCH Verlag GmbH&Co. KGaA, Weinheim.
语种：
英文
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Microwave-assisted, palladium-catalyzed carbonylative cyclization - Rapid synthesis of 2-quinolones from unprotected 2-iodoanilines and terminal alkynes
作者：
Chen, Jia-Rong;Liao, Jie;Xiao, Wen-Jing*
期刊：
CANADIAN JOURNAL OF CHEMISTRY ,2010年88(4):331-337 ISSN：0008-4042
通讯作者：
Xiao, Wen-Jing
作者机构：
[Xiao, Wen-Jing; Chen, Jia-Rong; Liao, Jie] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.;[Xiao, Wen-Jing] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Xiao, Wen-Jing] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
关键词：
microwave;palladium;carbonylation;2-iodoaniline;2-quinolone
摘要：
Palladium-catalyzed cyclocarbonylations of 2-iodoanilines with various terminal alkynes have been carried out by the use of commercially available molybdenum hexacarbonyl as a convenient and solid carbon monoxide source. The reactions were conducted at 160 °C for 30 min under microwave irradiation and in the presence of Et3N in THF, affording the corresponding 2-quinolone derivatives in good regioselectivities and yields.
语种：
英文
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An Enantioselective Approach to Highly Substituted Tetrahydrocarbazoles through Hydrogen Bonding-Catalyzed Cascade Reactions
作者：
Wang, Xu-Fan;Chen, Jia-Rong;Cao, Yi-Ju;Cheng, Hong-Gang;Xiao, Wen-Jing*
期刊：
Organic Letters ,2010年12(5):1140-1143 ISSN：1523-7060
通讯作者：
Xiao, Wen-Jing
作者机构：
[Wang, Xu-Fan; Cheng, Hong-Gang; Xiao, Wen-Jing; Chen, Jia-Rong; Cao, Yi-Ju] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Hubei, Peoples R China.;[Xiao, Wen-Jing] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Xiao, Wen-Jing] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
摘要：
Chemical Equation Presentation A hydrogen bonding-mediated double Michael addition-aromatization cascade of 2-propenylindoles and nitroolefins has been disclosed. The methodology allows an efficient synthesis of diverse and structurally complex tetrahydrocarbazoles In good to excellent enantioselectivities and diastereoselectivities. © 2010 American Chemical Society.
语种：
英文
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Convenient synthesis of tetrahydro-γ-carbolines and tetrahydroquinolines through a chemo- and regioselectivity switch by a broønsted acid catalyzed, one-pot, multicomponent reaction
作者：
Cheng, Hong-Gang;Chen, Cai-Bao;Tan, Fen;Chang, Ning-Jie;Chen, Jia-Rong* ;...
期刊：
European Journal of Organic Chemistry ,2010年2010(26):4976-4980 ISSN：1434-193X
通讯作者：
Chen, Jia-Rong
作者机构：
[Chen, Cai-Bao; Cheng, Hong-Gang; Chang, Ning-Jie; Tan, Fen; Xiao, Wen-Jing; Chen, Jia-Rong] Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol Minist Educ, Wuhan 430079, Hubei, Peoples R China.;[Chen, Jia-Rong] Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol Minist Educ, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Chen, Jia-Rong] C;Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol Minist Educ, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
关键词：
Chemoselectivity;Multicomponent reactions;Nitrogen heterocycles;Fused-ring systems
摘要：
An efficient, one-pot, multicomponent reaction of aldehydes 1, p-methoxyaniline (2a), and 2-vinylindoles 3 was developed. This approach provides a practical approach to synthetically and biologically significant tetrahydro-γ-carboline and tetrahydroquinoline derivatives in good yields through a chemo- and regioselectivity switch, which can be tuned by simply changing the substituent on the indole component under identical reaction conditions. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
语种：
英文
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Tuning electronic and steric effects: Highly enantioselective [4+1] pyrroline annulation of sulfur ylides with α,β-unsaturated imines
作者：
Lu, Liang-Qiu;Zhang, Ji-Ji;Li, Fang;Cheng, Ying;An, Jing;...
期刊：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION ,2010年49(26):4495-4498 ISSN：1433-7851
通讯作者：
Chen, Jia-Rong
作者机构：
[Lu, Liang-Qiu; Cheng, Ying; Li, Fang; Xiao, Wen-Jing; Chen, Jia-Rong; Zhang, Ji-Ji; An, Jing] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Hubei, Peoples R China.;[Chen, Jia-Rong] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Chen, Jia-Rong] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
关键词：
[4+1] annulation;nitrogen heterocycles;pyrroline;sulfur;ylides
摘要：
(Chemical equation presented) A change in tune: A novel [4+1] annulation between atropisomeric sulfur ylides 1 and unsaturated imines 2 was developed. The method allows the synthesis of enantioenriched pyrroline products 3 in high yield and with excellent stereocontrol. The origin of stereoinduction was primarily rationalized by a conformational analysis of the ylides. © 2010 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
语种：
英文
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Electronic coupling between two cyclometalated ruthenium centers bridged by 1,3,6,8-Tetra(2-pyridyl)pyrene (tppyr)
作者：
Yao, Chang-Jiang;Sui, Long-Zhen;Xie, Hai-Yan;Xiao, Wen-Jing;Zhong, Yu-Wu* ;...
期刊：
INORGANIC CHEMISTRY ,2010年49(18):8347-8350 ISSN：0020-1669
通讯作者：
Zhong, Yu-Wu
作者机构：
[Sui, Long-Zhen; Yao, Chang-Jiang; Zhong, Yu-Wu; Yao, Jiannian] Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Photochem, Inst Chem, Beijing 100190, Peoples R China.;[Yao, Chang-Jiang; Xiao, Wen-Jing] Cent China Normal Univ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.;[Sui, Long-Zhen; Xie, Hai-Yan] Beijing Inst Technol, Sch Life Sci & Technol, Beijing 100081, Peoples R China.
通讯机构：
[Zhong, Yu-Wu] C;Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Photochem, Inst Chem, Beijing 100190, Peoples R China.
摘要：
A new cyclometalating bridging ligand 1,3,6,8-tetra(2-pyridyl)pyrene was designed and synthesized through 4-fold Suzuki couplings between 1,3,6,8-tetrabromopyrene and 2-pyridylboronate. A bis-cyclometalated bisruthenium complex bridged by this ligand showed the presence of an electronic coupling between individual metal centers, as indicated by electrochemical and spectroscopic studies.
语种：
英文
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Highly enantioselective Michael addition of aldehydes to nitroolefins catalyzed by primary amine thiourea organocatalysts
作者：
Chen, Jia-Rong* ;Zou, You-Quan;Fu, Liang;Ren, Fan;Tan, Fen;...
期刊：
Tetrahedron ,2010年66(29):5367-5372 ISSN：0040-4020
通讯作者：
Chen, Jia-Rong
作者机构：
[Ren, Fan; Tan, Fen; Fu, Liang; Xiao, Wen-Jing; Chen, Jia-Rong; Zou, You-Quan] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.;[Chen, Jia-Rong] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Chen, Jia-Rong] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
关键词：
Organocatalysis;Michael addition;Amine thiourea;Nitroolefin
摘要：
Asymmetric Michael addition reactions of aldehydes to nitroolefins have been successfully initiated by a series of primary amine thiourea bifunctional catalysts, with high enantioselectivities (90–98% ee) and excellent yields (80–96%). The privileged quinine scaffold was found to be essential to the reaction efficiency and enantioselectivity.
语种：
英文
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ChemInform Abstract: Tuning Electronic and Steric Effects: Highly Enantioselective [4 + 1] Pyrroline Annulation of Sulfur Ylides with α,β-Unsaturated Imines.
作者：
Liang-Qiu Lu;Ji-Ji Zhang;Fang Li Dr.;Ying Cheng;Jing An;...
期刊：
Angewandte Chemie ,2010年122(26):4597-4600 ISSN：0044-8249
作者机构：
[Liang-Qiu Lu; Ji-Ji Zhang; Fang Li Dr.; Ying Cheng; Jing An; Jia-Rong Chen Dr.; Wen-Jing Xiao Prof. Dr.] Key Laboratory of Pesticide & Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan, Hubei 430079 (China), Fax: (+86) 27-6786-2041 http://chem-xiao.ccnu.edu.cn/
关键词：
[4+1]-Cycloadditionen;Pyrroline;Schwefel;Stickstoffheterocyclen;Ylide
摘要：
The reaction of atropisomeric sulfur ylides (I) with unsaturated imines bearing a bulky sulfonyl group at the nitrogen provides pyrroline-2-carboxylates with excellent stereocontrol.
语种：
英文
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Homology Modeling and Screening of New 14 alpha-Demethylase Inhibitor (DMI) Fungicides Based on Optimized Expression of CYP51 from Ustilago maydis in Escherichia coli
作者：
Han, Rui;Zhang, Jianhua;Li, Shuxiang;Cao, Shufen;Geng, Hui;...
期刊：
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY ,2010年58(24):12810-12816 ISSN：0021-8561
通讯作者：
Liu, Deli
作者机构：
[Yuan, Yongze; Liu, Deli; Zhang, Jianhua; Han, Rui; Cao, Shufen; Geng, Hui; Li, Shuxiang] Huazhong Normal Univ, Hubei Key Lab Genet Regulat & Integrat Biol, Coll Life Sci, Wuhan 430079, Peoples R China.;[Han, Rui] Qinghai Univ, Inst Hort, Qinghai Acad Agr & Forestry, Xining 810016, Peoples R China.;[Liu, Shenghua; Xiao, Wenjing; Liu, Deli] Minist Educ, Key Lab Pesticide & Chem Biol CCNU, Wuhan 430079, Peoples R China.
通讯机构：
[Liu, Deli] H;Huazhong Normal Univ, Hubei Key Lab Genet Regulat & Integrat Biol, Coll Life Sci, Wuhan 430079, Peoples R China.
关键词：
CYP51;Ustilago maydis;homology modeling;optimized expression;site-directed mutagenesis;DMI fungicides
摘要：
Ustilago maydis infection is a serious disease affecting corn crops worldwide. Sterol 14α-demethylase (CYP51) is one of the key enzymes of sterol biosynthesis and an effective target of antifungal drugs. To further study the interaction between CYP51 and drugs and exploit more specific 14α-demethylase inhibitor (DMI) fungicides for U. maydis, in this study homology modeling of CYP51 from U. maydis (UmCYP51) templated as the eukaryotic orthologues (the human CYP51) and screening of new DMI fungicides based on optimized expression were carried out for the first time. In addition, XF-113 and ZST-4 were screened by analyzing the spectral characteristics between the purified UmCYP51-35 and fungicides. These results provide a theoretical basis and new ideas for efficient design and development of new antifungal drugs. ©2010 American Chemical Society.
语种：
英文
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Optimised expression and spectral analysis of the target enzyme CYP51 from Penicillium digitatum with possible new DMI fungicides
作者：
Zhang, Jianhua;Zhao, Li;Zhang, Jie;Han, Rui;Li, Shuxiang;...
期刊：
Pest Management Science ,2010年66(12):1344-1350 ISSN：1526-498X
通讯作者：
Liu, Deli
作者机构：
[Yuan, Yongze; Liu, Deli; Zhao, Li; Zhang, Jianhua; Zhang, Jie; Han, Rui; Li, Shuxiang] Cent China Normal Univ, Coll Life Sci, Hubei Key Lab Genet Regulat & Integrat Biol, Wuhan 430079, Peoples R China.;[Xiao, Wenjing; Liu, Deli; Wan, Jian] Minist Educ, Key Lab Pesticide & Chem Biol CCNU, Wuhan, Peoples R China.
通讯机构：
[Liu, Deli] C;Cent China Normal Univ, Coll Life Sci, Hubei Key Lab Genet Regulat & Integrat Biol, Wuhan 430079, Peoples R China.
关键词：
sterol 14 alpha-demethylase;Penicillium digitatum;optimised expression;binding spectra;new DMI fungicide;EC50
摘要：
BACKGROUND: Sterol 14α-demethylase (CYP51), a key target of azole (DMI) fungicides, can be expressed in both prokaryotes and eukaryotes. Green mould of citrus, caused by Penicillium digitatum (Pers.) Sacc., is a serious post-harvest disease. To develop specific and more effective fungicides against this disease, the characteristics of the interaction between sterol 14α-demethylase from P. digitatum (PdCYP51) and possible new fungicides were analysed. The cyp51 gene of P. digitatum was cloned and expressed under different conditions in Escherichia coli (Mig.) Cast. & Chalm., and the binding spectra of PdCYP51 were explored by the addition of two commercial azoles and four new nitrogen compounds.RESULTS: The yield of soluble protein (PdCYP51) was largest when expressed in Rosetta (DE3) induced by 0.5 mM IPTG for 8 h at 30 °C. Compound B (7-methoxy-2H-benzo[b][1,4]thiazine-3-amine) showed the strongest binding activity of the four new nitrogen compounds, with a K d value of 0.268 μM. The K d values of the six compounds were significantly correlated with their EC 50 values.CONCLUSION: The spectral analysis and bioassay results could be used to screen the new chemical entities effectively. Compound B, selected by virtual screening from a commercial chemical library, is a candidate for a new DMI fungicide. These results provide a theoretical basis and new ideas for efficient design and development of new antifungal agents. Copyright © 2010 Society of Chemical Industry Copyright © 2010 Society of Chemical Industry.
语种：
英文
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Dynamic NMR Study and Detailed 1H and 13C Assignments of an ADAR Precursor in Solvent
作者：
Liu, Chenchen;Lu, Liangqiu;Xiao, Wenjing;Liu, Xiaopeng;Li, Fang*
期刊：
Applied Magnetic Resonance ,2010年39(3):309-318 ISSN：0937-9347
通讯作者：
Li, Fang
作者机构：
[Lu, Liangqiu; Xiao, Wenjing; Li, Fang; Liu, Chenchen; Liu, Xiaopeng] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Li, Fang] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.
关键词：
Nuclear Magnetic Resonance;Nuclear Magnetic Resonance Experiment;Conformational Exchange;Nuclear Magnetic Resonance Resonance;Dynamic Nuclear Magnetic Resonance
摘要：
A nitrogen-containing compound, named methyl-4-phenyl-2-(2,4,6-triisopropyl-phenylsulfonamido)but-3-enoate (MPSN), is used as a precursor for inverse-electron-demand aza-Diels-Alder reaction. Its 1H and 13C nuclear magnetic resonances (NMR) were fully assigned by a combination of one- and two-dimensional NMR experiments. It was found that this compound had two conformers (a and b) in the process of assignments. Exchange spectroscopy (EXSY) was used to study the exchange dynamics of this compound in solvent. On the basis of 1H NMR and EXSY experiments at various temperatures, thermodynamic and dynamic parameters of the conformational exchange process were deduced for this compound. The free-energy activation (ΔG≠) at 298 K is 15.07 ± 0.6 kcal mol-1, which suggests that the conformational exchange might be the result of C=N bond rotation. © 2010 Springer.
语种：
英文
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Novel thiourea-amine bifunctional catalysts for asymmetric conjugate addition of ketones/aldehydes to nitroalkenes: Rational structural combination for high catalytic efficiency
作者：
Chen, Jia-Rong* ;Cao, Yi-Ju;Zou, You-Quan;Tan, Fen;Fu, Liang;...
期刊：
Organic & Biomolecular Chemistry ,2010年8(6):1275-1279 ISSN：1477-0520
通讯作者：
Chen, Jia-Rong
作者机构：
[Tan, Fen; Fu, Liang; Xiao, Wen-Jing; Chen, Jia-Rong; Zou, You-Quan; Zhu, Xiao-Yu; Cao, Yi-Ju] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Hubei, Peoples R China.;[Chen, Jia-Rong] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Chen, Jia-Rong] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
关键词：
ENANTIOSELECTIVE MICHAEL ADDITION;ALPHA;BETA-UNSATURATED ALDEHYDES;CINCHONA ALKALOIDS;ALPHA-DISUBSTITUTED ALDEHYDES;CARBONYL-COMPOUNDS;ORGANIC CATALYSIS;ALDOL REACTIONS;NITRO-OLEFINS;QUATERNARY STEREOCENTERS;3-DICARBONYL COMPOUNDS
摘要：
A series of thiourea-amine bifunctional catalysts have been developed by a rational combination of prolines with cinchona alkaloids, which are connected by a thiourea motif. The catalyst 3a, prepared from L-proline and cinchonidine, was found to be a highly efficient catalyst for the conjugate addition of ketones/aldehydes to a wide range of nitroalkenes (up to 98/2 dr and 96% ee). The privileged cinchonidine backbone and the thiourea motif are essential to the reaction activity and enantioselectivity.
语种：
英文
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Organocatalytic asymmetric sulfa-michael/michael addition reactions: A strategy for the synthesis of highly substituted chromans with a quaternary stereocenter
作者：
Wang, Xu-Fan;Hua, Qiu-Lin;Cheng, Ying;An, Xiao-Lei;Yang, Qing-Qing;...
期刊：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION ,2010年49(45):8379-8383 ISSN：1433-7851
通讯作者：
Chen, Jia-Rong
作者机构：
[Wang, Xu-Fan; Yang, Qing-Qing; Cheng, Ying; Xiao, Wen-Jing; Chen, Jia-Rong; An, Xiao-Lei; Hua, Qiu-Lin] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Hubei, Peoples R China.;[Chen, Jia-Rong] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Chen, Jia-Rong] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
关键词：
heterocycles;hydrogen bonds;Michael addition;organocatalysis;synthetic methods
摘要：
Simply complex: Diverse and structurally complex chroman derivatives with a quaternary stereocenter have been obtained through the titled reaction of thiols with nitroolefin enoates using the bifunctional catalyst 1. The reaction features simple experimental procedures, high yield, enantiomeric excess, and excellent diastereoselectivity. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
语种：
英文
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Construction of fused heterocyclic architectures by formal [4+l]/[3+2] cycloaddition cascade of sulfur ylides and nitroolefins
作者：
Lu, Liang-Qiu;Li, Fang;An, Jing;Zhang, Ji-Ji;An, Xiao-Lei;...
期刊：
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION ,2009年48(50):9542-9545 ISSN：1433-7851
通讯作者：
Xiao, Wen-Jing
作者机构：
[Lu, Liang-Qiu; Li, Fang; Xiao, Wen-Jing; An, Xiao-Lei; An, Jing; Zhang, Ji-Ji; Hua, Qiu-Lin] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, Wuhan 430079, Hubei, Peoples R China.;[Xiao, Wen-Jing] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Xiao, Wen-Jing] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Coll Chem, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
关键词：
cascade reaction;cycloaddition;nitroolefins;sulfur ylides
摘要：
[Chemical equation presented] Under control: A format [4+1]/[3+2] cycloaddition cascade of sulfur ylides and alkene-tethered nitroolefins has been developed, and provides an efficient synthesis of fused polycyclic heterocyclic compounds in good to excellent overall yields with excellent diastereocontrol (see scheme). A catalytic asymmetric variant of this reaction has also been disclosed © 2009 Wiley-VCH Verlag GmbH & Co. KCaA.
语种：
英文
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Highly enantioselective desymmetrization of meso- and prochiral cyclic ketones via organocatalytic Michael reaction
作者：
Chen, Jia-Rong;Lai, Yuan-Yuan;Lu, Hai-Hua;Wang, Xu-Fan;Xiao, Wen-Jing*
期刊：
Tetrahedron ,2009年65(45):9238-9243 ISSN：0040-4020
通讯作者：
Xiao, Wen-Jing
作者机构：
[Wang, Xu-Fan; Lai, Yuan-Yuan; Xiao, Wen-Jing; Chen, Jia-Rong; Lu, Hai-Hua] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, Wuhan 430079, Hubei, Peoples R China.;[Xiao, Wen-Jing] Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
通讯机构：
[Xiao, Wen-Jing] C;Cent China Normal Univ, Coll Chem, Minist Educ, Key Lab Pesticide & Chem Biol, 152 Luoyu Rd, Wuhan 430079, Hubei, Peoples R China.
摘要：
An efficient and novel organocatalyst has been developed for the asymmetric desymmetrization of meso- and prochiral ketones by direct Michael addition to nitroolefins. This strategy can afford the desymmetrization products with excellent diastereo- (up to >99:1) and enantioselectivity (up to 96%) in great yields (up to 95%). (C) 2009 Elsevier Ltd. All rights reserved.
语种：
英文
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Organocatalytic synthesis and sterol 14α-demethylase binding interactions of enantioriched 3-(1H-1,2,4-triazol-1-yl)butyl benzoates
作者：
Ming, Zhi-Hui;Xu, Sheng-Zhen;Zhou, Lei;Ding, Ming-Wu* ;Yang, Jiao-Yan;...
期刊：
Bioorganic & Medicinal Chemistry Letters ,2009年19(14):3938-3940 ISSN：0960-894X
通讯作者：
Ding, Ming-Wu
作者机构：
[Ming, Zhi-Hui; Zhou, Lei; Xiao, Wen-Jing; Xu, Sheng-Zhen; Ding, Ming-Wu] Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.;[Yang, Shao; Yang, Jiao-Yan] Cent China Normal Univ, Coll Life sci, Wuhan 430079, Peoples R China.
通讯机构：
[Ding, Ming-Wu] C;Cent China Normal Univ, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Peoples R China.
关键词：
CYP51;Michael addition;Organocatalysis;Triazole
摘要：
1H-1,2,4-Triazole reacted with 2-butenal in the presence of diaryl prolinol silyl ether 3 and benzonic acid to give 3-(1H-1,2,4-triazol-1-yl)butanal 4, which was subsequently reduced and then treated with various acyl chloride to generate enantioriched 3-(1H-1,2,4-triazol-1-yl)butyl benzoates 6. Some of triazoles 6 exhibited strong binding interactions with the cytochrome P450-dependent sterol 14α-demethylase (CYP51). For example, compound (R)-6f showed the best binding activity with Kd 0.3381 μM. © 2009 Elsevier Ltd. All rights reserved.
语种：
英文
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Tandem Ring-Opening/Closing Reactions of N-Ts Aziridines and Aryl Propargyl Alcohols Promoted by t-BuOK
作者：
Wang, Liang;Liu, Qi-Bin;Wang, Duo-Sheng;Li, Xin;Han, Xiu-Wen;...
期刊：
Organic Letters ,2009年11(5):1119-1122 ISSN：1523-7060
通讯作者：
Xiao, Wen-Jing
作者机构：
[Han, Xiu-Wen; Liu, Qi-Bin; Wang, Duo-Sheng; Zhou, Yong-Gui; Wang, Liang; Li, Xin] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China.;[Xiao, Wen-Jing; Wang, Liang] Cent China Normal Univ, Coll Chem, Key Lab Pesticide & Chem Biol, Minist Educ, Wuhan 430079, Hubei, Peoples R China.;[Xiao, Wen-Jing] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, 457 Zhongshan Rd, Dalian 116023, Peoples R China.
通讯机构：
[Xiao, Wen-Jing] C;Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, 457 Zhongshan Rd, Dalian 116023, Peoples R China.
摘要：
t-BuOK was found to be an effective promoting reagent for tandem ring-opening/closing reactions of various N-Ts aziridines and aryl propargyl alcohols to afford dihydroxazine derivatives in moderate to good yields. A plausible reaction mechanism has been proposed.
语种：
英文
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