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Paladhi, Sushovan,Liu, Yidong,Kumar, B. Senthil,Jung, Min-Jung,Park, Sang Yeon,Yan, Hailong,Song, Choong Eui THE AMERICAN CHEMICAL SOCIETY 2017 ORGANIC LETTERS Vol.19 No.12
<P>The potential of Song's chiral oligoethylene glycol's (oligoEGs) as catalysts was explored in the enantioselective protonation of trimethylsilyl enol ethers in combination with alkali metal fluoride (KF and CsF) and in the presence of a proton source Highly enantioselective protonatigns of various silyl enol ethers of alpha-substituted tetralohes were achieved, producing chiral alpha-substituted-Jetralones in full conversion and with up to 99% ee. The established protocol was successfully exiended to the synthesis of biologically relevant chiral alpha-substituted chromanone and thiothromarione derivatives.</P>
Organocatalytic Enantioselective Cycloetherifications Using a Cooperative Cation-Binding Catalyst
Jadhav, Amol P.,Oh, Jeong-A,Hwang, In-Soo,Yan, Hailong,Song, Choong Eui American Chemical Society 2018 ORGANIC LETTERS Vol.20 No.17
<P>A highly enantioselective cycloetherification strategy for the straightforward synthesis of enantioenriched tetrahydrofurans, tetrahydropyrans, and oxepanes using Song’s cation-binding oligoEG catalyst and KF as the base is demonstrated. A wide range of <I>ε-</I>, <I>ζ-</I>, and η-hydroxy-α,β-unsaturated ketones were cyclized to the corresponding five-, six-, and seven-membered chiral oxacycles with high enantiopurity. This remarkably successful catalysis can be ascribed to systematic cooperative cation-binding catalysis in a densely confined supramolecular chiral cage generated <I>in situ</I> from the chiral catalyst, substrate, and KF.</P> [FIG OMISSION]</BR>
Tan, Yu,Luo, Shilong,Li, Dongmei,Zhang, Nan,Jia, Shiqi,Liu, Yidong,Qin, Wenling,Song, Choong Eui,Yan, Hailong American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.18
<P>Structural motifs containing contiguous halide bearing stereocenters are common in natural products as well as bioactive molecules. A few successful examples have been reported in the area of asymmetric vicinal dihalogenation of alkenes for accessing dihalogenated products; in this report, an alternative generation method of contiguous halide-bearing stereocenters alpha,beta,gamma,delta relative to carbonyl group in excellent enantioselectivity is proposed by utilizing a Song's oligoEG catalyst-catalyzed asymmetric beta-elimination. According to this methodology, a wide range of anti-syn-trihalides and anti-syn-anti-tetrahalides with high levels of enantioselectivity were synthesized. The synthetic utility of the contiguous halide-bearing stereocenters was demonstrated by several transformations. The results of high-resolution mass spectrometry indicated that the favorable interaction between catalyst and one of the enantiomers of racemic contiguously multihalogenated ketone contributed to the original enantioselectivity of dehydrohalogenation. A deuterium kinetic isotope effect experiment revealed that this beta-elimination reaction proceeds by the E2 mechanism. This strategy opens a new pathway for the asymmetric synthesis of contiguous halide bearing stereocenters of great complexity.</P>
Duan, Mengying,Liu, Yidong,Ao, Jun,Xue, Lu,Luo, Shilong,Tan, Yu,Qin, Wenling,Song, Choong Eui,Yan, Hailong American Chemical Society 2017 ORGANIC LETTERS Vol.19 No.9
<P>A chiral, fluoride-catalyzed asymmetric cascade sulfaMichael/aldol condensation reaction of 1,4-dithiane-2,5-diol and a series of alpha,beta-unsaturated ketones is described to access chiral trisubstituted tetrahydrothiophene derivatives. The target products, including the spiro tetrahydrothiophene derivatives bearing a five-, six-, and seven-membered ring, were highly functionalized and showed high ee value. This established protocol realized a highly enantioselective reaction with a catalytic amount of KF and Song's chiral oligoEG via in situ generated chiral fluoride to construct useful heterocyclic skeletons with great complexity.</P>
劉秋根(Liu Qiu-gen),宋燕鵬(Song Yan-peng) 경북대학교 아시아연구소 2009 아시아연구 Vol.- No.5
南宋時에 地方士人들은 적극적으로 대형교량의 건설과 重修활동에 참여하였다. 이들은 직접적으로 資金을 내어 參與하든지 아니면 社會에 影響力을 발휘하는 방식으로 參與하기도 하였다. 南宋時期다수의 士人들은 公益事業의 主體로써 참여하였는데, 政府施政能力의 萎縮이 士人로 하여금 地方의 橋樑건설과 重修활동에 참여할 수 있는 空間을 제공하였다. “富”에 대한 社會的觀念의 비평은 士人들의 橋樑건설과 重修참여에 輿論의 支持를 제공하였고, 佛教徒또한 士人이 橋樑건설과 重修활동에 참여하는 것을 모범으로 간주하였다. 士人이 橋樑修建에 참여함으로써 士人이 地方事務에 평소 관심을 가지고 있음을 보여주었다. 士人은 橋樑修建等의 活動에 참여함으로써 지방 輿論으로부터 好評을 받았을 뿐만 아니라, 社會事務에 대한 某種의 解釋과 支配權도 갖게 되었다. 이것은 새로운 基層社會勢力成長의 標誌라 할 수 있겠다. During the Southern Song Dynasty,Intellectual started to actively participate in large-scale bridge construction activities,and to participate in two ways of capital and social impact to exert their influence. The growing in strength of Intellectual groups provided the main of undertaking public welfare. The shrinking of government's administrative capability provided the space for Intellectual to participate in bridge construction activities. Social concepts of "the rich" were criticized provided public opinion support for Intellectual participating in bridge construction. Buddhists Set an example for Intellectual to participate in the activities of a bridge construction. Intellectual involved in the construction of the bridge reflects the Intellectual 's concern for local affairs. Through participation in activities such as bridge construction Intellectual received favorable public opinion, but also accessed to a certain extent of the interpretation of Social Affairs dominance. This had become a sign of new growth of grass-roots social forces.
Preparation and enhanced CO2 adsorption capacity of UiO-66/graphene oxide composites
Yan Cao,Qin Zhong,Yunxia Zhao,Zijian Lv,Fujiao Song 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
New composites of UiO-66 and graphene oxide (GO) were synthesized and tested as CO2 adsorbents atroom temperature. The materials and the parent composite components were characterized using X-raydiffraction (XRD), thermo-gravimetric analysis (TGA), nitrogen adsorption–desorption isothermanalysis, scanning electron microscopy (SEM), and FT-IR spectroscopy. The CO2 isotherms on theUiO-66/GO composites and the UiO-66 were measured by a static volumetric method separately. Experiments of multiple adsorption/desorption cycles were conducted to estimate reversibility of CO2on the UiO-66/GO. The results showed that the BET surface area of the composites was higher than thatof the parent UiO-66, and the adsorption capacities of CO2 on the composites were greatly higher thanthat on the UiO-66 sample. The composite UiO-66/GO-5 exhibited the maximum CO2 uptake of3.37 mmol/g at 298 K and 1 bar, which increased by 48% in comparison with that of the UiO-66, and wasmuch higher than those of the conventional activated carbons and the zeolites. The CO2 adsorptioncapacity was dependent on the BET surface area and the micropore volume of the composites. Finally, theadsorption/desorption cycle experiment revealed that the adsorption performance of UiO-66/GO-5 wasfairly stable, without noticeable degradation in the adsorption capacity of CO2 after 6 cycles. Therefore,this kind of composites has a potential application on CO2 capture technologies to mitigate globalwarming.
Yan Chen,Qiong Wu,Jun Wang,Youtao Song 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Powdery photocatalyst has shown great potential in wastewater treatment, yet the low reusability is stillits deficiency. In this work, we prepared magnetically recyclable lanthanum-nitrogen co-doped titania/CaFe2O4/diatomite (LN-TCD) ternary material by sol-gel technology. The photocatalytic activity of thismaterial was evaluated via the decomposition of antibiotic oxytetracycline and disinfection of bacteriaEscherichia coli under visible light. Charge transfer took place at the interface between titania andCaFe2O4, and improved the photocatalytic activity. The photodecomposition rate was accelerated by thehigh adsorption ability of substrate diatomite. The optimal preparation and experimental factors weredetermined, and the decomposition mechanism was proposed.
Yan-Qing Duan,Song-Tao He,Qing-Qing Li,Ming-Feng Wang,Wen-Yuan Wang,Wei Zhe,Yong-Hong Cao,Ming-He Mo,Yu-Long Zhai,Wen-Jun Li 한국미생물학회 2013 The journal of microbiology Vol.51 No.3
A Gram-positive, catalase- and oxidase-positive, strictly aerobic, endospore-forming rod bacterium, designated K3514T, was isolated from the leaves of Nicotiana tabacum. The strain was able to grow at temperatures of 8–40°C, pH 5.0–10.0 and NaCl concentrations of 0–7%. The predominant quinones (>30%) of this strain were MK-7(H2) and MK-7. Phylogenetic analysis of 16S rRNA gene sequence showed that strain K3514T was affiliated to the genus Lysinibacillus, with its closest relatives being Lysinibacillus mangiferihumi (98.3% sequence similarity), Lysinibacillus sphaericus (97.9% sequence similarity), Lysinibacillus fusiformis (97.4% sequence similarity), and Lysinibacillus xylanilyticus (97.3% sequence similarity). However, low levels of DNA-DNA relatedness values suggested that the isolate was distinct from the other closest Lysinibacillus species. Additionally, based on analysis of morphological, physiological, and biochemical characteristics, the isolate could be differentiated from the closest known relatives. Therefore, based on polyphasic taxonomic data, the novel isolate likely represents a novel species, for which the name Lysinibacillus tabacifolii sp. nov. and the type strain K3514T (=KCTC 33042T =CCTCC AB 2012050T) are proposed.
Song, Ming-Xia,Deng, Xian-Qing,Wei, Zhi-Yu,Zheng, Chang-Ji,Wu, Yan,An, Chang-Shan,Piao, Hu-Ri Shaheed Beheshti University of Medical Sciences 2015 Iranian journal of pharmaceutical research Vol.14 No.1
<P>The microbial resistance has become a global hazard with the irrational use of antibiotics. Infection of drug-resistant bacteria seriously threatens human health. Currently, there is an urgent need for the development of novel antimicrobial agents with new mechanisms and lower levels of toxicity. In this paper, a series of (<I>S</I><I>,Z</I>)-4-methyl-2-(4-oxo-5-((5-substitutedphenylfuran-2-yl) methylene)-2-thioxothiazolidin-3-yl)pentanoic acids via a Knoevenagel condensation were synthesized and evaluated for their antibacterial activity <I>in</I><I>-</I><I>vitro</I>. The synthesized compounds were characterized by IR, <SUP>1</SUP>H NMR and MS. The antibacterial test<I> in</I><I>-</I><I>vitro</I> showed that all of the synthesized compounds had good antibacterial activity against several Gram-positive bacteria (including multidrug-resistant clinical isolates) with minimum inhibitory concentration (MIC) values in the range of 2–4 µg/mL. Especially compounds 4c, 4d, 4e and 4f were the most potent, with MIC values of 2 µg/mL against four multidrug-resistant Gram-positive bacterial strains.</P>
Yan, Hailong,Oh, Joong-Suk,Song, Choong Eui Royal Society of Chemistry 2011 Organic & Biomolecular Chemistry Vol.9 No.23
<P>A mild and efficient protocol for the deprotection of silyl ethers using KF in tetraethylene glycol is reported. A wide range of alcoholic silyl ethers can be selectively cleaved in high yield in the presence of certain acid- and base-labile functional groups. Moreover, the phenolic silyl ethers were cleaved exclusively, without affecting the alcoholic silyl ethers, at room temperature.</P> <P>Graphic Abstract</P><P>A mild and efficient protocol for the selective deprotection of silyl ethers using KF in an oligoethene glycol (<I>e.g.</I>, tetraethylene glycol) is reported. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1ob06300f'> </P>