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Showing 1 to 20 of 33 for “"Pyrroles"”.
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Substituted Thieno(3,2-B)pyrroles
Made available in DSpace on 2014-12-05T19:37:26Z (GMT). No. of bitstreams: 1 6001699.pdf: 3601018 bytes, checksum: 4fb0f8414c3a8cf20b4fc2dbd8cd7a4d (MD5) Previous issue date: 1960
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The Multicomponent Synthesis of Pyrroles from Cylcopropane S Using a One Pot Pd(0) Catalyzed Dehydrocarbonylation Protocol
… a sequence of chemical transformations specific pyrroles generated from the above methodology could be transformed into either BM 212 an anti-tuberculosis drug or Atorvastatin Calcium an anti-cholesterol drug. Each pharmaceutical will be derived using a three component coupling reaction and then …
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Gold-catalysed reactions of Nitrogen containing molecules
… Two new strategies have been employed to access pyrroles by the cycloisomerisation of alkynyl aziridines, and the formation of α,β-unsaturated imides by the oxidation of ynamides has been developed. A rare gold-mediated vinylidene rearrangement of brominated or silylated alkynes has been used to …
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The Substituted Pyrrole JB-03-14 Induces Autophagic Cell Death and Growth Arrest in Breast Tumor Cells
… from marine organisms, specifically brominated pyrroles. We utilized an in vitro breast cancer model to study the effects of pyrroles on tumor proliferation and survival, as well as growth arrest and cell death. Our findings indicate that the substituted pyrrole JG-03-14 induces time dependent …
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"The New Chemistry" - Sustainable Catalysis with Alcohols
… secondary alcohols with β-amino alcohols, pyrroles were accessible. After adapting the synthesis protocol to this new class of products the tolerance of functional groups was tested. Diversely functionalized alcohols were used. Under mild reaction conditions (90 °C) and very low catalyst …
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Calix[4]pyrrole-based ion pair receptors
… on the basis of calix[4]arenes and calix[4]pyrroles. Calix[4]pyrroles and calix[4]arene derivatives bearing crown ethers or ester groups are known to act as efficient receptors for anions and cations, respectively. Therefore, the synthetic combination or modification of these two macrocyclic …
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Metal-ligand redox interaction in the multielectron chemistry of porphyrinogen coordination compounds
… zero, one, and two direct bonds between adjacent pyrroles, respectively. All three are isolated on the preparative scale, and interconverted electrochemically (Chapter II). Each carbon-carbon bond functions as a reservoir of two redox equivalents. The neutral oxidation state exhibits an optical …
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Developments in Nickel-catalyzed Transfer Hydrocyanation Reactions and Novel Skeletal Editing Strategies through Nitrogen Atom Insertion
… into quinazolines or quinoxalines, as well as pyrroles into pyrimidines, indenes into isoquinolines, or cyclopentadienes into pyridines (see Scheme II). The initial reaction design was based on the mechanistic proposal for the previously established Ciamician-Dennstedt rearrangement and the …
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Ab Initio Density Functional Theory Optimized Geometries of Vinyl Trialkylammonium, Vinylpyridinium and Vinyldiazonium Tetrafluoroborate Salts with Natural Bond Orbital Charge Distributions in the Gas Phase
… used to make 2,5-furans, -pyrroles, and -thiophenes. In an effort to expand the scope and synthetic utility of these valuable and versatile reagents and, more fundamentally, to understand better their electronic properties (and thus their reactivity), the first computational …
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Total synthesis and study of myrmicarin alkaloids
… II. Palladium Catalyzed Synthesis of N-Vinyl Pyrroles and Indoles A stereospecific palladium catalyzed N-vinylation of azaheterocycles with vinyl triflates is described. Cyclic and acyclic vinyl triflates along with non-nucleophilic azaheterocycles were found to be substrates for this …
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Development of Earth Abundant Metal-Catalyzed Reactions to Construct Heterocycles
… the deoxygenation to convert 1,2-oxazines into pyrroles. The exposure of ortho-substituted nitroarenes to 3 mol % of (4,7-MeO-phen)Fe(OAc)2 and phenylsilane as the stoichiometricreductant afforded six-or seven-membered N-heterocycles. The scope of the reaction is broad and tolerates a range of …
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Pyrrolopyrrole-Based Materials for High-Contrast Electrochromics
… applications. Dihydropyrrolo[3,2-<em>b</em>]pyrroles (DHPPs) are synthetically simple and highly tailorable chromophores that can be decorated with diverse functionalities that readily manipulate optoelectronic properties useful for a variety of applications. However, a thorough understanding …
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The design of synthetic transmembrane carriers for anions
… activity of a series of strapped calix[4]pyrroles provided by J. L. Sessler and C.-H. Lee was investigated. It was found that the straps were able to encourage transport mechanisms not exhibited by the parent macrocycle, while a series of control compounds were inactive<br/>
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Part I. Computational, theoretical and synthetic studies of the indole arynes and their reactions. Part II. Computational, theoretical, and mechanistic studies of n-vinyltrialkylammonium, n-vinylpyridinium, and n-vinyldiazonium tetrafluoroborate salts.
… cycloaddition with 2-substituted furans and pyrroles, as well as new insights brought about by various indole-like heterostructures. Part II: Vinyltrialkylammonium and vinylimmonium tetrafluoroborate salts are a novel class of molecule first implied by Buszek and Jung for Diels-Alder …
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Reactions and rearrangements of chroman-4-ones and related compounds
… a range of benzopyrano isoxazoles, pyrazoles. pyrroles and pyrimidines. 3-Hydroxymethylenespiro[chroman-2. 1 '-cyclopentan]-4-one is particularly unstable to acid-base conditions. Attempts to prepare this compound resulted only in the formation of 3-(1 cyclopentenyl)chromone, arising from a …
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Intramolecular carbenoid insertion : reactions of [alpha] -diazoketones derived from benzothienyl, pyrolyl and indolyl alkanoic acids with rhodium (II) acetate
… on a-diazoketones tethered to benzothiophenes, pyrroles and indoles by a methylene linker. In the case of benzothiophenes, it was shown that the rhodium catalyst decomposition of I-diazo-4-(3-benzothienyl)-2-butanone (146) and 1-diazo-4-(3benzothienyl)- 2-butanone (152) allow for the isolation …
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Part I: Palladium PEPPSI-IPENT CI, A Useful Catalyst for Challenging Amination Reactions Part II: Generation Of Benzynes in Flow Reactors followed by Subsequent Diels-Alder Reactions
… with benzynes follow the order: furans > pyrroles > thiophene.
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Aromaticity Across States: A Framework for Reactivity and Structure in Organic Systems
… state, whereas [4n+2] systems (e.g., borepins, pyrroles) favor photoassociation through relief of excited-state antiaromaticity. This framework further explains unusual photochemical behaviors, including bond-cleavage induced charge transfer in borafluorenes. The third part addresses the …
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Palladium-catalyzed C-N cross-coupling and application to the synthesis of delayed singlet emitters for OLED development
… to Narylated imidazoles, pyrazoles, thiazoles, pyrroles, and thiophenes in moderate to excellent yield. Experimental results and DFT calculations point to the need for electronrich and especially sterically demanding biaryl dialkylphosphine ligands to promote these difficult cross-coupling …
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Metal complexes with ligand-tethered organo-hydride donor groups - new prospects for efficient multi-electron reduction
… a novel synthesis of 2,5-di(2-pyridyl)-1H-pyrroles was uncovered. This new methodology opens the door to the essentially untapped coordination chemistry of these ligand precursors. This new synthesis could be applied to the preparation of novel macrocycles which showed interesting …
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