bluuebunny/crossref_metadata_2025_split huggingface dataset:
Heterogeneity of breast cancer stem cells as evidenced with Notch‐dependent and Notch‐independent populations
Authors: Wong Nelson K. Y. , Fuller Megan , Sung Sandy , Wong Fred , Karsan Aly 
Published: July 2012

AbstractStudies have suggested the potential importance of Notch signaling to the cancer stem cell population in some tumors, but it is not known whether all cells in the cancer stem cell fraction require Notch activity. To address this issue, we blocked Notch activity in MCF‐7 cells by expressing a dominant‐negative MAML‐GFP (dnMAML) construct, which inhibits signaling through all Notch receptors, and quantified the effect on tumor‐initiating activity. Inhibition of Notch signaling reduced primary tumor sphere formation and side population. Functional quantification of tumor‐initiating cell numbers in vivo showed a significant decrease, but not a complete abrogation, of these cells in dnMAML‐expressing cells. Interestingly, when assessed in secondary assays in vitro or in vivo, there was no difference in tumor‐initiating activity between the dnMAML‐expressing cells and control cells. The fact that a subpopulation of dnMAML‐expressing cells was capable of forming primary and secondary tumors indicates that there are Notch‐independent tumor‐initiating cells in the breast cancer cell line MCF‐7. Our findings thus provide direct evidence for a heterogeneous cancer stem cell pool, which will require combination therapies against multiple oncogenic pathways to eliminate the tumor‐initiating cell population.
Patterned Self‐Assembled Monolayers: Efficient, Chemically Defined Tools for Cell Biology
Authors: Koepsel Justin T. , Murphy William L. 
Published: July 2012

AbstractSelf‐assembled monolayers (SAMs) of alkanethiolates on gold can be used to carefully probe immobilized biomolecule interactions with cell‐surface receptors. However, due to a lack of experimental throughput associated with labor‐intensive production, specialized fabrication apparatus, and other practical challenges, alkanethiolate SAMs have not had widespread use by biological researchers. In this Minireview, we investigate a range of techniques that could enhance the throughput of SAM‐based approaches by patterning substrates with arrays of different conditions. Here we highlight microfluidic, photochemical, localized removal, and backfilling techniques to locally pattern SAM substrates with biomolecules and also describe how these approaches have been applied in SAM‐based screening systems. Furthermore we provide perspectives on several crucial barriers that need to be overcome to enable widespread use of SAM chemistry in biological applications.
Modeling of Conjugated Heat Transfer in Direct‐Contact Membrane Distillation of Seawater Desalination Systems
Authors: Ho C.‐D. , Yang T.‐J. , Wang B.‐C. 
Published: July 2012

AbstractThe modeling equations for the temperature distribution and temperature polarization profiles in a laminar concurrent‐flow parallel‐plate direct‐contact membrane distillation (DCMD) module were developed theoretically. The analytical solutions for such conjugated Graetz problems in DCMD systems were obtained using the variable separation method with an orthogonal expansion technique extended in power series. A description of the average Nusselt number variations and temperature distributions of both the hot and cold feed streams is given. The feed velocity effect on the temperature profiles and average Nusselt number was examined and is reported by employing the computed eigenvalues and the relevant constants. The analytical results show that the initial saline temperature effect on the hot feed stream regarding the pure water productivity is more significant than that of the hot and cold feed stream velocity variations.
Unique Ordered TiO2 Superstructures with Tunable Morphology and Crystalline Phase for Improved Lithium Storage Properties
Authors: Hong Zhensheng , Xu Yuxia , Liu Yubin , Wei Mingdeng 
Published: July 2012

AbstractUnique ordered TiO2 superstructures with tunable morphology and crystalline phase were successfully prepared by the use of different counterions. Dumbbell‐shaped rutile TiO2 and nanorod‐like rutile mesocrystals constructed from ultrathin nanowires, and quasi‐octahedral anatase TiO2 mesocrystals built from tiny nanoparticle subunits were achieved. Interestingly, the obtained anatase mesocrystals have a fine microporous structure and a large surface area. The influence of the counterions in the reaction system is discussed and possible mechanisms responsible for the formation of the unique ordered TiO2 superstructures with different morphologies and crystalline phases are also proposed based on a series of experimental results. The obtained TiO2 superstructures were used as anode materials in lithium ion batteries, and exhibited higher capacity and improved rate performance; this is attributed to the intrinsic characteristics of the mesoscopic TiO2 superstructures, which have a single‐crystal‐like and porous nature.
Optimized Synthesis, Structural Investigations, Ligand Tuning and Synthetic Evaluation of Silyloxy‐Based Alkyne Metathesis Catalysts
Authors: Heppekausen Johannes , Stade Robert , Kondoh Azusa , Seidel Günter , Goddard Richard , Fürstner Alois 
Published: July 2012

AbstractNitride‐ and alkylidyne complexes of molybdenum endowed with triarylsilanolate ligands are excellent (pre)catalysts for alkyne‐metathesis reactions of all sorts, since they combine high activity with an outstanding tolerance toward polar and/or sensitive functional groups. Structural and reactivity data suggest that this promising application profile results from a favorable match between the characteristics of the high‐valent molybdenum center and the electronic and steric features of the chosen Ar3SiO groups. This interplay ensures a well‐balanced level of Lewis acidity at the central atom, which is critical for high activity. Moreover, the bulky silanolates, while disfavoring bimolecular decomposition of the operative alkylidyne unit, do not obstruct substrate binding. In addition, Ar3SiO groups have the advantage that they are more stable within the coordination sphere of a high‐valent molybdenum center than tert‐alkoxides, which commonly served as ancillary ligands in previous generations of alkyne metathesis catalysts. From a practical point of view it is important to note that complexes of the general type [(Ar3SiO)3MoX] (X = N, CR; R = aryl, alkyl, Ar = aryl) can be rendered air‐stable with the aid of 1,10‐phenanthroline, 2,2′‐bipyridine or derivatives thereof. Although the resulting adducts are themselves catalytically inert, treatment with Lewis acidic additives such as ZnCl2 or MnCl2 removes the stabilizing N‐donor ligand and gently releases the catalytically active template into the solution. This procedure gives excellent results in alkyne metathesis starting from air‐stable and hence user‐friendly precursor complexes. The thermal and hydrolytic stability of representative molybdenum alkylidyne and ‐nitride complexes of this series was investigated and the structure of several decomposition products elucidated.
The Vital Role of Buffer Anions in the Antioxidant Activity of CeO2 Nanoparticles
Authors: Xue Ying , Zhai Yanwu , Zhou Kebin , Wang Lei , Tan Haina , Luan Qingfen , Yao Xin 
Published: July 2012

AbstractCerium oxide (CeO2) nanoparticles display excellent antioxidant properties by scavenging free radicals. However, some studies have indicated that they can cause an adverse response by generating reactive oxygen species (ROS). Hence, it is important to clarify the factors that affect the oxidant/antioxidant activities of CeO2 nanoparticles. In this work, we report the effects of different buffer anions on the antioxidant activity of CeO2 nanoparticles. Considering the main anions present in the body, Tris‐HCl, sulfate, and phosphate buffer solutions have been used to evaluate the antioxidant activity of CeO2 nanoparticles by studying their DNA protective effect. The results show that CeO2 nanoparticles can protect DNA from damage in Tris‐HCl and sulfate systems, but not in phosphate buffer solution (PBS) systems. The mechanism of action has been explored: cerium phosphate is formed on the surface of the nanoparticles, which interferes with the redox cycling between Ce3+ and Ce4+. As a result, the antioxidant activity of CeO2 nanoparticles is greatly affected by the external environment, especially the anions. These results may provide guidance for the further practical application of CeO2 nanoparticles.
Application of Copper(I) Iodide/Diorganoyl Dichalcogenides to the Synthesis of 4‐Organochalcogen Isoquinolines by Regioselective CN and CChalcogen Bond Formation
Authors: Stein André L. , Bilheri Filipe N. , da Rocha Juliana T. , Back Davi F. , Zeni Gilson 
Published: July 2012

AbstractA copper‐catalyzed cyclization of (ortho‐alkynyl)benzaldimines with diorganoyl dichalcogenides allowed the synthesis of 4‐organochalcogen isoquinolines, whereas the presence of base in the reaction medium inhibited the product formation producing the undesirable isoquinoline without the organochalcogen atom at the 4‐position. The cyclization reaction was carried out by using CuI (20 %) as a catalyst with diorganoyl dichalcogenides (1.5 equiv) in the presence of DMF at 100 °C. Furthermore, the reaction did not require an argon atmosphere and was carried out in an open flask. The cyclization reaction tolerated a variety of functional groups both in ortho‐alkynylbenzaldimines and diorganoyl dichalcogenides, such as trifluoromethyl, chloro, fluorine, and methoxyl, to give the six‐membered heterocyclic ring exclusively through a 6‐endo‐dig cyclization process. The organochalcogen group present at the 4‐position of the isoquinoline ring was further subjected to a selective chalcogen–lithium exchange reaction followed by the addition of aldehydes to afford the desired secondary alcohols in good yields. The obtained isoquinolines also proved to be suitable substrates for the Suzuki and Sonogashira coupling conditions affording the corresponding products through CC bond formation.
ChemInform Abstract: Unveiling Structure—Property Relationships in Sr2Fe1.5Mo0.5O6‐δ, an Electrode Material for Symmetric Solid Oxide Fuel Cells.
Authors: Munoz‐Garcia Ana B. , Bugaris Daniel E. , Pavone Michele , Hodges Jason P. , Huq Ashfia , Chen Fanglin , zur Loye Hans‐Conrad , Carter Emily A. 
Published: July 2012

AbstractThe promising new solid oxide fuel cell electrode material Sr2Fe1.5Mo0.5O5.90 is characterized by powder neutron diffraction and DFT calculations.
ChemInform Abstract: LiFe0.8Mn0.2PO4/C Cathode Material with High Energy Density for Lithium‐Ion Batteries.
Authors: Wang Zhao‐Hui , Yuan Li‐Xia , Zhang Wu‐Xing , Huang Yun‐Hui 
Published: July 2012

AbstractThe title composites are synthesized by solid state reaction promoted by wet ball milling from stoichiometric amounts of Li2CO3, FeC2O4, MnC2O4, and NH4H2PO4 in acetone (calcination in N2, 350 °C, 6 h).
ChemInform Abstract: Oscillatory Template Exchange in Polyoxometallate Capsules: A Ligand‐Triggered, Redox‐Powered, Chemically Damped Oscillation.
Authors: Miras Haralampos N. , Sorus Marjorie , Hawkett Jonathan , Sells Daniel O. , McInnes Eric J. L. , Cronin Leroy 
Published: July 2012

AbstractAn oscillatory template exchange between phosphate and vanadate anions in an aqueous mixture of (NH4)6P2Mo18O62, triethanolamine, and NH4VO3 (80—90 °C) is monitored by ESI‐MS, EPR, and UV/VIS spectroscopy.
ChemInform Abstract: Hydrothermal Synthesis of Size‐Controllable Yttrium Orthovanadate (YVO4) Nanoparticles and Its Application in Photocatalytic Degradation of Direct Blue Dye.
Authors: Mohamed R. M. , Harraz F. A. , Mkhalid I. A. 
Published: July 2012

AbstractSize‐controlled YVO4 nanoparticles are hydrothermally synthesized from propanol solutions of Y(NO3)3 and NH4VO3 (autoclave, 150 °C, 4—24 h).
ChemInform Abstract: Pb4VBO8: Synthesis, Crystal Structure, and Properties.
Authors: Gao Junyu , Pan Shilie , Cao Jian , Dong Xiaoyu , Yang Zhihua 
Published: July 2012

AbstractThe title compound is prepared by solid state reaction of PbO, V2O5, and B2O3 in the molar ratio 8:1:1 (600 °C, 72 h).
ChemInform Abstract: Long Hydrogen‐Bonded Rod of Molecular Oxide: A Hexatantalate Tetramer.
Authors: Matsumoto Miki , Ozawa Yoshiki , Yagasaki Atsushi 
Published: July 2012

Abstract(NBu4)3.5 [H4.5(Ta6O19)] is synthesized by reaction of a hydrous tantalum oxide obtained by treatment of K8[Ta6O19]·17H2O with HCl with an aqueous solution of NBu4OH (90 °C, 72 h) followed by dissolving the obtained product in toluene (85 °C, 16 h, yield given in g).
ChemInform Abstract: Sb and Se Substitution in CsBi4Te6: The Semiconductors CsM4Q6 (M: Bi, Sb; Q: Te, Se), Cs2Bi10Q15, and CsBi5Q8.
Authors: Chung Duck Young , Uher Ctirad , Kanatzidis Mercouri G. 
Published: July 2012

AbstractSolid solutions CsBi4‐xSbxTe6 (x ≤ 2.0) and CsBi4Te6‐ySey (y ≤ 3.0) are synthesized by direct reaction of stoichiometric mixtures of Cs and the precursors Bi2‐aSbaTe3 (a = 0.1—0.5), and Bi2Te3‐bSeb (b = 0.1—1.5), resp.
ChemInform Abstract: Hydroxy‐amide Functionalized Azolium Salts for Cu‐Catalyzed Asymmetric Conjugate Addition: Stereocontrol Based on Ligand Structure and Copper Precatalyst.
Authors: Shibata Naotsu , Yoshimura Misato , Yamada Haruka , Arakawa Ryuichi , Sakaguchi Satoshi 
Published: July 2012

AbstractThe azolium salts (I) efficiently promote the asymmetric addition of dialkylzincs to cyclic enones.
ChemInform Abstract: Asymmetric Hydrogenation of C=C Double Bonds Using Rh‐Complex under Homogeneous, Heterogeneous and Continuous Mode Conditions.
Authors: Balogh Szabolcs , Farkas Gergely , Madarasz Jozsef , Szoellosy Aron , Kovacs Jozsef , Darvas Ferenc , Uerge Laszlo , Bakos Jozsef 
Published: July 2012

AbstractA novel chiral ligand is synthesized and successfully applied in the Rh‐catalyzed asymmetric hydrogenation of acetamides (I) and dimethyl itaconate (III).
ChemInform Abstract: Diels—Alder Reaction of Fused Pyran‐2‐ones with Ethyl Vinyl Ether.
Authors: Juranovic Amadej , Kranjc Kristof , Polanc Slovenko , Perdih Franc , Kocevar Marijan 
Published: July 2012

AbstractEthyl vinyl ether (II) can be applied as a useful synthetic equivalent of acetylene in microwave‐assisted Diels—Alder reactions with fused pyran‐2‐ones.
ChemInform Abstract: Intermolecular Ritter‐Type C—H Amination of Unactivated sp3 Carbons.
Authors: Michaudel Quentin , Thevenet Damien , Baran Phil S. 
Published: July 2012

AbstractC—H Amination of unactivated sp3 centers (non‐benzylic and non‐allylic) using MeCN as an inexpensive source of nitrogen proceeds under scalable and mild conditions and high functional group tolerance in the presence of a modified Selectfluor reagent.
ChemInform Abstract: Acid‐Labile δ‐Ketal‐β‐hydroxy Esters by Asymmetric Hydrogenation of Corresponding δ‐Ketal‐β‐keto Esters in the Presence of CaCO3.
Authors: Fan Weizheng , Li Wanfang , Ma Xin , Tao Xiaoming , Li Xiaoming , Yao Ying , Xie Xiaomin , Zhang Zhaoguo 
Published: July 2012

AbstractCaCO3 plays a dual role in the hydrogenation reaction ‐ removing the acid generated during the formation of the catalyst and maintaining the activity of the catalyst.
ChemInform Abstract: Enantioselective Cyclizations of Silyloxyenynes Catalyzed by Cationic Metal Phosphine Complexes.
Authors: Brazeau Jean‐Francois , Zhang Suyan , Colomer Ignacio , Corkey Britton K. , Toste F. Dean 
Published: July 2012

AbstractNovel asymmetric 5‐exo‐dig and 5‐endo‐dig cyclizations of silyloxyenynes using palladium and gold complexes are described.
ChemInform Abstract: Straightforward Synthesis of Nonconjugated Cyclohex‐3‐enone and Conjugated 4‐Methylenecyclohex‐2‐enone Derivatives.
Authors: Kuttner Julian R. , Warratz Svenja , Hilt Gerhard 
Published: July 2012

AbstractNonconjugated cyclohexenones (III) and (V)/(VI) are available by Co‐catalyzed Diels—Alder reaction of 2‐siloxybutadiene (I) with alkynes followed by Bu4NF‐promoted desilylation.
ChemInform Abstract: Ligand Effects on the Stereochemical Outcome of Suzuki—Miyaura Couplings.
Authors: Lu Guo‐Ping , Voigtritter Karl R. , Cai Chun , Lipshutz Bruce H. 
Published: July 2012

AbstractThe coupling of (Z)‐alkenyl halides (I) depends on the P‐ligand used in the transformations.
ChemInform Abstract: Iron(II)‐Catalyzed Trifluoromethylation of Potassium Vinyltrifluoroborates.
Authors: Parsons Andrew T. , Senecal Todd D. , Buchwald Stephen L. 
Published: July 2012

AbstractIt is crucial to use Togni′s reagent (I) as a limiting one to avoid formation of side products.
ChemInform Abstract: Skeletal Diversity via Pd(0) Catalyzed Three‐Component Cascades of Allene and Halides or Triflates with Protected Hydroxylamines and Formamide.
Authors: Elboray Elghareeb E. , Gao Chuanjun , Grigg Ronald 
Published: July 2012

AbstractA range of protected hydroxylamines and formamides is prepared.
ChemInform Abstract: Palladium‐Catalyzed, Highly Efficient, Regiocontrolled Arylation of Electron‐Rich Allylamines with Aryl Halides.
Authors: Deng Yuheng , Jiang Zhen , Yao Min , Xu Dan , Zhang Lingjuan , Li Huanrong , Tang Weijun , Xu Lijin 
Published: July 2012

AbstractThe choice of solvent, olefin, ligand, and additive has a fundamental influence on the regioselectivity and reactivity of the title reaction.
ChemInform Abstract: Highly Efficient Asymmetric Michael Addition of Aldehyde to Nitroolefin Using Perhydroindolic Acid as a Chiral Organocatalyst.
Authors: Zhao Lina , Shen Jiefeng , Liu Delong , Liu Yangang , Zhang Wanbin 
Published: July 2012

AbstractPerhydroindolic acid, obtained as a by‐product in the industrial production of a trandolapril intermediate, is used as a chiral organocatalyst in asymmetric Michael addition reactions of aldehydes to nitroolefins.
ChemInform Abstract: Graphite Oxide as an Efficient and Durable Metal‐Free Catalyst for Aerobic Oxidative Coupling of Amines to Imines.
Authors: Huang Hai , Huang Jun , Liu Yong‐Mei , He He‐Yong , Cao Yong , Fan Kang‐Nian 
Published: July 2012

AbstractA series of symmetrical imines (II) is prepared by solvent‐free amine oxidation in the presence of graphite oxide as a reusable catalyst.
ChemInform Abstract: Nickel‐Catalyzed [4 + 2] Cycloaddition for Highly Substituted Arenes.
Authors: Horie Hiroaki , Kurahashi Takuya , Matsubara Seijiro 
Published: July 2012

AbstractNi(0)‐Catalyzed [4 + 2] cycloaddition of electron‐deficient dienes (I) to alkynes (II), (IV), (VI) and (IX) and subsequent aromatization affords highly substituted arenes (III), (V), (VII)/(VIII) and (X), respectively.
ChemInform Abstract: Triphosgene Mediated Chlorination of Baylis—Hillman Adducts.
Authors: Thatikonda Narender Reddy , Chebolu Naga Sesha Saipavan Kumar , Budde Mahendar , Vaidya Jayathirtha Rao 
Published: July 2012

AbstractA mild and efficient method for the chlorination of Baylis—Hillman adducts using the triphosgene—pyridine system is described.
ChemInform Abstract: Rhodium(II)‐Catalyzed Asymmetric Sulfur(VI) Reduction of Diazo Sulfonylamidines.
Authors: Selander Nicklas , Fokin Valery V. 
Published: July 2012

AbstractThe unusual asymmetric atom transfer “reduction” of diazo sulfonylamidines (I) gives the sulfinylamidines (II) under mild conditions.
ChemInform Abstract: Cu(acac)2‐Catalyzed Synthesis of Functionalized Bis(arylmethyl)zinc Reagents and Their Olefination Reaction with Aromatic Aldehydes.
Authors: Fu Ying , Hu Xuemei , Chen Yaojuan , Yang Yanshou , Hou Hongxia , Hu Yulai 
Published: July 2012

AbstractIntermediates of type (IV) are formed in the first step.
ChemInform Abstract: Multisubstituted Furan Formation from (Z)‐ or (E)‐Enynyl Acetates: Tandem Reactions Accelerated by Electron‐Donating Groups on Aromatic Rings.
Authors: Okamoto Noriko , Yanada Reiko 
Published: July 2012

AbstractTreatment of various substrates with NIS or NBS allows an efficient, metal‐free access to multisubstituted furans.
ChemInform Abstract: Synthesis of 2‐Phenylbenzofuran Derivatives and Selective Binding Activities on Estrogen Receptor.
Authors: Zhang Ping , Yang Yewei , Zheng Xiaoliang , Huang Wenhai , Ma Zhen , Shen Zhengrong 
Published: July 2012

AbstractAn improved protocol for the synthesis of 2‐arylbenzofuran derivatives is developed.
ChemInform Abstract: Enantioselective Construction of Pyrrolidines by Palladium‐Catalyzed Asymmetric [3 + 2] Cycloaddition of Trimethylenemethane with Imines.
Authors: Trost Barry M. , Silverman Steven M. 
Published: July 2012

AbstractThe asymmetric [3 + 2] cycloaddition of trimethylenemethane equivalents (II) and (VII) towards a wide range of N‐Boc and N‐Tos aldimines and ketimines proceeds efficiently in the presence of a Pd—phosphoramidite ligand to give enantioenriched polysubstituted pyrrolidine derivatives in high stereoselectivities (up to <99% e.e.
ChemInform Abstract: Synthesis of 3‐Fluoro‐3‐aryl Oxindoles: Direct Enantioselective α‐Arylation of Amides.
Authors: Wu Linglin , Falivene Laura , Drinkel Emma , Grant Sharday , Linden Anthony , Cavallo Luigi , Dorta Reto 
Published: July 2012

AbstractThe enantioselective construction of a C—F bond is based on an asymmetric α‐arylation protocol and allows the preparation of the title compounds with good yields and excellent enantioselectivities.
ChemInform Abstract: An Expeditious and Efficient Synthesis of Symmetrical Tris(indolyl)methanes under Catalyst‐Free Conditions in Fluorinated Alcohols.
Authors: Khaksar Samad , Vahdat Seyed Mohammad , Gholizadeh Mahnaz , Talesh Saeed Mohammadzadeh 
Published: July 2012

AbstractThe reaction of orthoesters (II) and (V) with indoles (I) and (IV) is performed in the non‐toxic and reusable hexafluoroisopropanol medium to afford the pure tris(indolyl)methanes (III) and (VI), resp., in high yields and short reaction times.
ChemInform Abstract: Synthesis of 4‐Substituted Chlorophthalazines, Dihydrobenzoazepinediones, 2‐Pyrazolylbenzoic Acid, and 2‐Pyrazolylbenzohydrazide via 3‐Substituted 3‐Hydroxyisoindolin‐1‐ones.
Authors: Nguyen Hanh Nho , et al. et al. 
Published: July 2012

AbstractTreatment of aminophthalimides with organometallic reagents leads to 3‐substituted 3‐hydroxyisoindolinones.
ChemInform Abstract: Remarkably Efficient Catalysts of Amidine Hydroiodides for the Synthesis of Cyclic Carbonates from Carbon Dioxide and Epoxides under Mild Conditions.
Authors: Aoyagi Naoto , Furusho Yoshio , Endo Takeshi 
Published: July 2012

AbstractThe reaction is carried out under mild conditions, e.g. ordinary pressure and ambient temperature.
ChemInform Abstract: Synthesis of 1‐Substituted 3‐Aryl‐5‐aryl(hetaryl)‐2‐pyrazolines and Study of Their Antitumor Activity.
Authors: Insuasty Braulio , Chamizo Leidy , Munoz Jhon , Tigreros Alexis , Quiroga Jairo , Abonia Rodrigo , Nogueras Manuel , Cobo Justo 
Published: July 2012

AbstractAmong a variety of 3‐aryl‐5‐(het)arylpyrazolines, e.g. (III) and (V), derivative (IIIa) exhibits important activity against various cancer cell lines with remarkable values in leukemia, renal and prostate cancer panels.
ChemInform Abstract: Imine Domino Reactions Generate Novel Scaffolds: Fused Bisthiazolidines or Bisthiiranes.
Authors: Saiz Cecilia , Castillo Valerie , Mahler S. Graciela 
Published: July 2012

Abstractβ‐Aminothiols (II) and (V) react with 2‐mercaptoacetaldehyde to generate iminium ions which cyclize to novel fused bisthiazolidines.
ChemInform Abstract: Asymmetric Synthesis of (Triaryl)methylamines by Rhodium‐Catalyzed Addition of Arylboroxines to Cyclic N‐Sulfonyl Ketimines.
Authors: Nishimura Takahiro , Noishiki Akira , Tsui Gavin Chit , Hayashi Tamio 
Published: July 2012

AbstractA new asymmetric addition of arylboroxines (II) to cyclic N‐sulfonyl ketimines (I) proceeds in the presence of a rhodium catalyst coordinated with a chiral diene ligand.
ChemInform Abstract: Synthesis of 2,3,5,6‐Tetrasubstituted Tetrahydropyrans via (3,5)‐Oxonium—Ene Reaction.
Authors: Saha Pipas , Bhunia Anup , Saikia Anil K. 
Published: July 2012

AbstractThe method renders possible a stereoselective access to a wide range of biologically important title structures.