bluuebunny/crossref_metadata_2025_split huggingface dataset:
ChemInform Abstract: One‐Pot Synthesis of Polysubstituted 2‐Piperidinones from Aromatic Aldehydes, Nitromethane, Ammonium Acetate, and Dialkyl Malonates.
Authors: Liu Hui , Sun Qian , Zhou Zhengquan , Liu Juanjuan , Yang Jing , Wang Cunde 
Published: October 2013

AbstractTitle compounds [(IV) and (VI)] are stereoselectively synthesized via pseudo‐five‐component reaction.
ChemInform Abstract: Ruthenium‐Catalyzed Aerobic Oxidative Cyclization of Aromatic and Heteroaromatic Nitriles with Alkynes: A New Route to Isoquinolones.
Authors: Reddy Mallu Chenna , Manikandan Rajendran , Jeganmohan Masilamani 
Published: October 2013

AbstractUnsymmetrically substituted alkynes (XIII) are found to regioselectively react in a fashion where the less hindered C‐H bond of the aromatic nitrile is preferably attacked by the alkyl substituted site of the alkyne.
ChemInform Abstract: A Catalytic Asymmetric Synthesis of Polysubstituted Piperidines Using a Rhodium(I)‐Catalyzed [2 + 2 + 2] Cycloaddition Employing a Cleavable Tether.
Authors: Martin Timothy J. , Rovis Tomislav 
Published: October 2013

AbstractThe Rh‐catalyzed [2 + 2 + 2] cycloaddition of oxygen or nitrogen linked alkenyl isocyanates (I) and (IV) and terminal alkynes proceeds with high enantioselectivity in the presence of an electron‐withdrawing phosphoramidite ligand.
ChemInform Abstract: Friedlaender Synthesis of Novel Benzopyranopyridines in the Presence of Chitosan as Heterogeneous, Efficient and Biodegradable Catalyst under Solvent‐Free Conditions.
Authors: Siddiqui Zeba N. , Khan Kulsum 
Published: October 2013

AbstractTitle compounds such as (III), (V), (VII), (IX), (XI), (XIII) and (XV) are prepared from coumarin (I) and corresponding active methylene compounds.
ChemInform Abstract: A Facile and Efficient Synthesis of Tetrahydro‐β‐carbolines.
Authors: Desroses Matthieu , Koolmeister Tobias , Jacques Sylvain , Llona‐Minguez Sabin , Jacques‐Cordonnier Marie‐Caroline , Cazares‐Koerner Armando , Helleday Thomas , Scobie Martin 
Published: October 2013

AbstractThe T3P‐promoted reaction of tryptamides with aldehydes under microwave irradiation allows the access to a broad spectrum of the N‐heterocyclic systems as alkaloid substructures and drug skeletons.
ChemInform Abstract: Microwave Assisted Palladium‐Catalyzed Synthesis of Phthalazinones and Pyridopyridazinones
Authors: Rao K. Penta , Basak Ashok K. , Deb Prasant K. , Sharma Somesh , Reddy L. Krishnakanth 
Published: October 2013

Abstractfrom o‐bromobenzaldehydes, arylhydrazines, and Mo(CO)6 as a non‐toxic alternative for CO
ChemInform Abstract: Convenient One‐Pot Synthesis of N3‐Substituted Pyrido[2,3‐d]‐, Pyrido[3,4‐d]‐, Pyrido[4,3‐d]‐pyrimidin‐4(3H)‐ones, and Quinazolin‐4(3H)‐ones Analogues.
Authors: Deau Emmanuel , Hedou Damien , Chosson Elizabeth , Levacher Vincent , Besson Thierry 
Published: October 2013

AbstractThe process allows the conversion of anthranilic acids as well as aminonicotinic acid and derivatives into the required heteroaromatic compounds.
ChemInform Abstract: Gold‐Catalyzed Synthesis of Glyoxals by Oxidation of Terminal Alkynes: One‐Pot Synthesis of Quinoxalines.
Authors: Shi Shuai , Wang Tao , Yang Weibo , Rudolph Matthias , Hashmi A Stephen K. 
Published: October 2013

AbstractThe title synthesis represents an attractive alternative to classical procedures.
ChemInform Abstract: A Rapid and Simple Diversity‐Oriented Synthesis of Novel 3‐Amino‐2′‐oxospiro[benzo[c]pyrano [3,2‐a]phenazine‐1,3′‐indoline]‐2‐carbonitrile/carboxylate Derivatives via a One‐Pot, Four‐Component Domino Reaction.
Authors: Mahdavinia Gholam Hossein , Mirzazadeh Maryam , Notash Behrouz 
Published: October 2013

AbstractThe title products are formed through a double C=N bond formation/Knoevenagel condensation/Michael addition/cyclization sequence.
ChemInform Abstract: ZnS Nanoparticles: An Efficient Catalyst for the One‐Pot Synthesis of Spiro[pyrrolidine‐2,3′‐oxindole] Derivatives from Phenothiazinyl Chalcones.
Authors: Ameta K. L. , Kumar Biresh , Rathore Nitu S. 
Published: October 2013

AbstractZnS nanoparticles efficiently catalyze the three‐component one‐pot synthesis of spiro title compounds of type (VI).
ChemInform Abstract: Amide‐Controlled Highly Selective Catalytic Borylcupration of Allenes.
Authors: Yuan Weiming , Zhang Xue , Yu Yihua , Ma Shengming 
Published: October 2013

AbstractThe novel copper‐catalyzed borylcupration of disubstituted 2,3‐allenamides (I) with bis(pinacolato)diboron produces Z‐β‐borylated β,γ‐unsaturated enoamides (III) with high regio‐ and stereoselectivity.
ChemInform Abstract: Synthesis and Biological Evaluation of New Paclitaxel Analogues and Discovery of Potent Antitumor Agents.
Authors: Nicolaou Kyriacos C. , Valiulin Roman A. 
Published: October 2013

AbstractA series of new paclitaxel analogues, such as (I)—(IV) is synthesized and screened for their cytotoxic activity.
ChemInform Abstract: An Efficient Procedure for the Synthesis of 2,3‐Unsaturated‐O‐glycosides: TiCl3(OTf) as the Catalyst for Type I Ferrier Rearrangement.
Authors: Chen Peiran , Lin Lei 
Published: October 2013

AbstractThe Ferrier rearrangement is performed with glucal (I) and a variety of structurally different alcohols.
ChemInform Abstract: Comparative Study of the Frech Catalyst with Two Conventional Catalysts in the Heck Synthesis of 2,4‐Diaminopyrimidine‐Based Antibiotics.
Authors: Nammalwar Baskar , Bunce Richard A. , Berlin K. Darrell , Bourne Christina R. , Bourne Philip C. , Barrow Esther W. , Barrow William W. 
Published: October 2013

AbstractThe Frech catalyst proves to be superior to conventional palladium‐based Heck catalysts, giving the desired products (III) and (V) in higher yields with fewer contaminants.
ChemInform Abstract: Preparation of Calcium Magnesium Acetate (CMA) Deicing Agent Using Waste Eggshell as Raw Materials.
Authors: Yang Li , Yan Qinghua , Ma Xiaoqin , Luo Tianjun , Wang Tianxi 
Published: October 2013

AbstractCalcium magnesium acetate deicing salt is prepared from waste egg shell (about 96% CaCO3 and 1% MgCO3) by calcination at 1000 °C (1 h) followed by adjustment of the Ca/Mg molar ratio with MgO to 0.6 and neutralization with glacial AcOH.
Construction and Test of a Gradient System for NMR Diffusion Studies in Interface Systems
Authors: Schlayer Stefan , Stallmach Frank , Horch Carsten , Splith Tobias , Pusch Anne‐Kristin , Pielenz Frederike , Peksa Mikulás 
Published: October 2013

AbstractFür NMR‐Diffusionsmessungen wurde ein z‐Gradientensystem zur Erzeugung intensiver Feldgradientenimpulse überarbeitet. Dazu wurde das Gradientenfeld einer aktiv abgeschirmten Spule mittels der Finite‐Elemente‐Methode optimiert. Das System wurde aus Glaskeramik als Spulenträger aufgebaut. Es besitzt kein 1H‐NMR‐Eigensignal und weist einen hohen Strom/Gradienten‐Wandlerfaktor von 0,37 T m–1A–1 auf. Mit dem Nachweis isotroper und anisotroper Diffusion in wässrigen Lösungen eines PEO‐PPO‐PEO Triblock‐Copolymers und adsorbierten Methans in zwei verschiedenen mikroporösen kristallinen Adsorbentien wird die Funktionstüchtigkeit des Systems demonstriert.
Atom für Atom
Authors: Sperl Alexander , Kröger Jörg , Berndt Richard 
Published: October 2013

AbstractMit Hilfe der Spitze eines Rastertunnelmikroskops wird ein einzelnes metallfreies Phthalocyanin‐Molekül in ein Silber‐Phthalocynanin auf einer Obefläche umgewandelt. Die Reaktionsschritte erfolgen Atom für Atom. Jedes Zwischenprodukt kann mit Hilfe von rastertunnelmikroskopischen Aufnahmen analysiert werden. Neben der schrittweisen Molekülumwandlung sind die Tautomerisierung und das H‐Hüpfen, die kontrolliert durch Injektion von Elektronen induziert werden, weitere Beispiele für die Präzision eines modernen Rastertunnelmikroskops.
Hydrothermal Self‐assembly Synthesis of Mn3O4/Reduced Graphene Oxide Hydrogel and Its High Electrochemical Performance for Supercapacitors
Authors: Li Li , Hu Zhongai , Yang Yuying , Liang Pengju , Lu Ailian , Xu Huan , Hu Yingying , Wu Hongying 
Published: October 2013

AbstractIn the present work Mn3O4/reduced graphene oxide hydrogel (Mn3O4‐rGOH) with three dimensional (3D) networks was fabricated by a hydrothermal self‐assembly route. The morphology, composition, and microstructure of the as‐obtained samples were characterized using powder X‐ray diffraction (XRD), X‐ray photoelectron spectroscopy (XPS), thermogravimetry analysis (TG), atomic absorption spectrometry (AAS), field emission scanning electron microscopy (FESEM) and transmission electron microscope (TEM). Moreover, the electrochemical behaviors were evaluated by cyclic voltammogram (CV), galvanostatic charge‐discharge and electrochemical impedance spectroscopy (EIS). The test results indicated that the hydrogel with 6.9% Mn3O4 achieved specific capacitance of 148 F·g−1 at a specific current of 1 A·g−1, and showed excellent cycling stability with no decay after 1200 cycles. In addition, its specific capacitance could retain 70% even at 20 A·g−1 in comparison with that at 1 A·g−1 and the operating window was up to 1.8 V in a neutral electrolyte.
Insight into the Structural Requirements of Protoporphyrinogen Oxidase Inhibitors: Molecular Docking and CoMFA of Diphenyl Ether, Isoxazole Phenyl, and Pyrazole Phenyl Ether
Authors: Yang Shenggang , Hao Gefei , Dayan Franck E. , Tranel Patrick J. , Yang Guangfu 
Published: October 2013

AbstractProtoporphyrinogen oxidase (PPO, EC 1.3.3.4) is one of the most significant targets for a large family of inhibitors that may be used as herbicide, bactericide, fungicide, or photosensitizing activator to treat cancer through photodynamic therapy (PDT). Molecular docking and CoMFA were combined in a multistep framework with the ultimate goal of identifying important factor contributing to the activity of PPO inhibitors. As a continuation of the previous research work on the development of new PPO inhibitors, the bioassay results indicated that good PPO inhibitors were discovered in all of the three chemical series with IC50 values ranging from 0.010 to 0.061 µmol·L−1. Using the crystal structure of tobacco mitochondrial PPO (mtPPO) as template, all the compounds were docked into the enzyme active site. The docking pose of each compound was subsequently used in a receptor‐based alignment, leading to the development of a significant CoMFA model with r2 value of 0.98 and q2 (cross validation r2) value of 0.63. This novel multistep framework gives insight into the structural characteristics for the binding of inhibitors, and it can be extended to other classes of PPO inhibitors. In addition, the simplicity of the proposed approach may be particularly applicable in virtual screening procedures.
Investigation on the Coordination Mode of IL‐Supported Diols Used as Phosphine‐Free Ligands for Palladium Catalyzed Heck Reaction
Authors: Cai Yueqin , Song Gonghua , Chen Xiao 
Published: October 2013

AbstractThe coordination mode of IL‐supported diols used as phosphine‐free ligands for palladium catalyzed Heck reaction has been investigated by tuning their compositions. The difference in coordination of these IL‐supported diols with metal Pd in Heck reaction was related to the changes of the cation rings, leading to the different activities of Pd catalyst in the reaction. The experimental results indicated that the activities of Pd catalyst were affected mainly by π‐electron density of the cation rings. Compared to pyridinium and piperidinium cations, imidazolium cations showed the best coordination to metal Pd. In the meantime, C‐2 hydrogen and the length of alkyl side chains had impacts on the coordination as well.
Synthesis and Physical Properties of Benzopyridazine‐Based Conjugated Molecules
Authors: Su Yuezeng , Xu Wei , Qiu Feng , Wu Dongqing , Liu Ping , Xue Minzhao , Zhang Fan 
Published: October 2013

AbstractA series of novel organic conjugated molecules (5a–5d) comprising 2,3‐benzopyridiazine as electron‐withdrawing core and thiophene derivatives as electron‐donating arms have been synthesized successfully in good yields. The ultraviolet‐visible (UV‐Vis) absorption spectra and fluorescence spectra of 5a–5d revealed that the optical properties are strongly influenced by the interactions between nitrogen and sulfur atoms in the conjugated backbone, as well as the position of the alkyl chains in the thiophene rings. The experimental results and theoretical calculation data clearly indicated that the band gap and the energy levels of LUMO and HOMO could be fine‐tuned by the position of alkyl chains in the thiophene rings. Thus, the structure‐property correlation of this class of conjugated molecules can be well established.
Gender‐Related Safety and Efficacy of Cardiac Resynchronization Therapy
Authors: Schuchert Andreas , Muto Carmine , Maounis Themistoklis , Frank Robert , Ella Rita Omega , Polauck Alexander , Padeletti Luigi ,   for the MASCOT Study Group
Published: October 2013

AbstractBackgroundCardiac resynchronization therapy (CRT) is an established therapy for patients with chronic heart failure (CHF) and a broad QRS complex. Gender‐related safety and efficacy data are necessary for informed patient decision‐making for female patients with CHF. The aim of the study was to assess the effects of gender on the outcome of CRT in highly symptomatic heart failure patients.HypothesisGender may have an effect on the outcome of heart failure patients undergoing cardiac resynchronisation therapy.MethodsThe study analyzed the 2‐year follow‐up of 393 New York Heart Association (NYHA) class III/IV patients with a class I CRT indication enrolled in the Management of Atrial Fibrillation Suppression in AF‐HF Comorbidity Therapy (MASCOT) study.ResultsIn female patients (n = 82), compared with male patients (n = 311), CHF was more often due to dilated cardiomyopathy (74% vs 44%, respectively; P < 0.0001). Females also had a more impaired quality‐of‐life score and a smaller left ventricular end‐diastolic diameter (LVEDD). Women were less likely than men to have received a CRT defibrillator (35% vs 61%, respectively; P < 0.0001). After 2 years, the devices had delivered more biventricular pacing in women than in men (96% ± 13% vs 94% ± 13%, respectively; P < 0.0004). Women had a greater reduction in LVEDD than did men (−8.2 mm ± 11.1 mm vs −1.1 mm ± 22.1 mm, respectively; P < 0.02). Both genders improved similarly in NYHA functional class. Women reported greater improvement than men in quality‐of‐life score (−21.1 ± 26.5 vs −16.2 ± 22.1, respectively; P < 0.0001). After adjustment for cardiovascular history, women had lower all‐cause mortality (P = 0.0007), less cardiac death (P = 0.04), and fewer hospitalizations for worsening heart failure (P = 0.01).ConclusionsFemales exhibited a better response to CRT than did males. Because females have such impressive benefits from CRT, improved screening and advocacy for CRT implantation in women should be considered.
Heart Failure in Patients With Atrial Fibrillation Is Associated With a High Symptom and Hospitalization Burden: The RealiseAF Survey
Authors: Silva‐Cardoso José , Zharinov Oleg J. , Ponikowski Piotr , Naditch‐Brûlé Lisa , Lewalter Thorsten , Brette Sandrine , Steg P. Gabriel ,   on behalf of the RealiseAF Investigators
Published: October 2013

AbstractBackgroundAtrial fibrillation (AF) and heart failure (HF) often coexist; the consequences of such coexistence are unclear.HypothesisHF in patients with AF is associated with poor outcomes.MethodsThis post hoc analysis of RealiseAF, a survey of AF patients, compared symptoms, hospitalizations, management, and AF control in patients with vs without HF. A total of 10,523 AF patients were analyzed according to presence/absence of HF.ResultsHistory of HF was present in 45.8%, and in more patients with permanent vs persistent, paroxysmal, or first‐episode AF (55.6%, 44.3%, 32.9%, and 29.8%, respectively; P < 0.0001). Patients with vs those without history of HF, and patients with HF and reduced ejection fraction (HF‐REF) vs those with HF and a preserved ejection fraction (HF‐PEF), had more frequent cardiovascular (CV) risk factors and more severe symptoms. Presence vs absence of HF, and HF‐REF vs HF‐PEF, were associated with lower rates of AF control (54.6% vs 62.8% and 49.3% vs 60.3%, respectively; both P < 0.0001). The rate‐control strategy was used more frequently in HF patients, particularly those with HF‐REF, than the rhythm‐control strategy. CV hospitalizations occurred more frequently in patients with HF than those without (41.8% vs 17.5%; P < 0.001) and more frequently in patients with HF‐REF than in those with HF‐PEF (51.6% vs 35.6%; P < 0.0001).ConclusionsAF patients with HF, particularly HF‐REF, experience heavy symptom and hospitalization burdens, and have relatively low rates of AF control. Further studies are needed to identify ways to improve the management and treatment outcomes of this very high‐risk patient population.
Differences in outcomes of newly diagnosed acute myeloid leukemia for adolescent/young adult and younger patients
Authors: Canner Jason , Alonzo Todd A. , Franklin Janet , Freyer David R. , Gamis Alan , Gerbing Robert B. , Lange Beverly J. , Meshinchi Soheil , Woods William G. , Perentesis John , Horan John 
Published: October 2013

BACKGROUNDStudies comparing survival of adolescent and young adult (AYA) patients to that of younger patients with newly diagnosed acute myeloid leukemia (AML) have yielded conflicting results. In order to more accurately characterize relative survival and other outcomes of AYA patients, a cross‐study analysis was conducted using data from recent trials conducted by the Children's Cancer Group (CCG) and Children's Oncology Group (COG).METHODSData were combined from the CCG‐2891, CCG‐2941, CCG‐2961, and AAML03P1 trials. The data set included 1840 patients, comprising 238 AYA and 1602 younger patients.RESULTSOverall survival was not significantly different in the 2 groups (AYA, 49% ± 7% versus younger, 54% ± 3% (± 2 standard errors), P = .058). Relapse was lower in AYA patients (30% ± 7% versus 41% ± 3%, P = .002), but treatment‐related mortality (TRM) was higher (25% ± 6% versus 12% ± 2%, P < .001). After adjustment for other factors, older age remained strongly associated with TRM (hazard ratio = 2.30, 95% CI = 1.59‐3.33, P < .001). Infection accounted for the excess TRM in AYA patients.CONCLUSIONSSurvival in AYA and younger patients with newly diagnosed AML is similar; however, older patients are at higher risk for TRM. More effective strategies for preventing mortality from infection in AYA patients are needed. Cancer 2013;119:4162–4169. © 2013 American Cancer Society.
Randomized phase 2 study of pegylated SN‐38 (EZN‐2208) or irinotecan plus cetuximab in patients with advanced colorectal cancer
Authors: Garrett Christopher R. , Bekaii‐Saab Tanios S. , Ryan Theresa , Fisher George A. , Clive Sally , Kavan Petr , Shacham‐Shmueli Einat , Buchbinder Aby , Goldberg Richard M. 
Published: October 2013

BACKGROUNDIrinotecan is cytotoxic in patients with advanced colorectal cancer (CRC). SN‐38 (10‐hydroxy‐7‐ethyl‐camptothecin) is the active metabolite of irinotecan. Attachment of polyethylene glycol (PEG) polymer chains (pegylation) to SN‐38 (EZN‐2208) increases the solubility, exposure, and half‐life of SN‐38. Preclinical studies demonstrated superior in vitro efficacy of EZN‐2208 when it was tested in irinotecan‐refractory human CRC cell lines.METHODSPatients with metastatic or locally recurrent CRC who had previously received 5‐flurouracil (5‐FU), oxaliplatin, and irinotecan were assigned to receive EZN‐2208 monotherapy (9 mg/m2 on days 1, 8, and 15 every 28 days for patients with KRAS‐mutant tumors only [arm A]), and patients with KRAS wild‐type tumors were randomized (2:1) to receive either EZN‐2208 plus cetuximab (400 mg/m2 loading dose on day 1 followed by 250 mg/m2 weekly starting on day 8 [arm B]) or irinotecan 125 mg/m2 on days 1 and 8 every 21 days plus cetuximab at the same doses indicated above (arm C).RESULTSThe overall response rate and progression‐free survival were 0% and 1.8 months, respectively, in arm A; 10.7% and 4.9 months (95% confidence interval [CI], 3.2‐5.8 months), respectively, in arm B; and 14.3% and 3.7 months (95% CI, 2.1‐5.8 months), respectively, in arm C. EZN‐2208 was well tolerated in combination with cetuximab. No statistically significant difference in survival was observed between arm B (9.8 months; 95% CI, 7.2‐11.2 months) and arm C (9.1 months; 95% CI, 6.0‐13.0 months).CONCLUSIONSEZN‐2208, either as monotherapy or in combination with cetuximab, was well tolerated in patients with refractory CRC. Overall survival and progression‐free survival were similar in the cetuximab plus irinotecan arm and the EZN‐2208 arm. Cancer 2013;119:4223–4230. © 2013 American Cancer Society.
Rebiopsy of non–small cell lung cancer patients with acquired resistance to epidermal growth factor receptor‐tyrosine kinase inhibitor
Authors: Hata Akito , Katakami Nobuyuki , Yoshioka Hiroshige , Takeshita Jumpei , Tanaka Kosuke , Nanjo Shigeki , Fujita Shiro , Kaji Reiko , Imai Yukihiro , Monden Kazuya , Matsumoto Takeshi , Nagata Kazuma , Otsuka Kyoko , Tachikawa Ryo , Tomii Keisuke , Kunimasa Kei , Iwasaku Masahiro , Nishiyama Akihiro , Ishida Tadashi , Nishimura Yoshihiro 
Published: October 2013

BACKGROUNDThe secondary epidermal growth factor receptor (EGFR) mutation Thr790Met (T790M) accounts for approximately half of acquired resistances to EGFR‐tyrosine kinase inhibitor (TKI). Recent reports have demonstrated that the emergence of T790M predicts a favorable prognosis and indolent progression. However, rebiopsy to confirm T790M status can be challenging due to limited tissue availability and procedural feasibility, and little is known regarding the differences among patients with or without T790M mutation.METHODSThe study investigated 78 EGFR‐mutant patients who had undergone rebiopsy after TKI failure. The peptide nucleic acid–locked nucleic acid polymerase chain reaction clamp method was used in EGFR mutational analyses. Various patient characteristics and postprogression survivals (PPSs) after initial TKI failure were retrospectively compared in patients with and without T790M.RESULTSThe T790M mutation was identified in 4 (17%) of 24 central nervous system lesions, and in 22 (41%) of 54 other lesions (P = .0417). No other characteristics had a statistical association with T790M prevalence. Median PPS was 31.4 months in 26 patients with T790M, and 11.4 months in 52 patients without T790M (P = .0017). In the multivariate analysis, statistically significant factors for longer PPS included T790M‐positive, good performance status, and no carcinomatous meningitis.CONCLUSIONSThe emergence of T790M in central nervous system lesions was rare, compared with other lesions. Patients with T790M after TKI failure appear to have better prognoses than those without T790M. TKI rechallenge or continuous administration beyond progression may be effective after initial TKI failure. Cancer 2013;119:4325–4332. © 2013 American Cancer Society.