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Showing papers in "Organic Letters in 2005"


Journal ArticleDOI
TL;DR: Cinchona alkaloid-derived chiral bifunctional thiourea organocatalysts were synthesized and applied in the Michael addition between nitromethane and chalcones with high ee and chemical yields.

862 citations


Journal ArticleDOI
TL;DR: These new air-stable complexes using the bis(trifluoromethanesulfonyl)imidate moiety as a weakly coordinating counter-anion are described and are exceedingly active for the catalysis of a wide range of enynes cycloisomerizations.

594 citations


Journal ArticleDOI
TL;DR: A Cu(II)-sensing, ratiometric, and selective fluorescent sensor 1, N-butyl-4,5-di[(pyridin-2-ylmethyl)amino]-1,8-naphthalimide, was designed and synthesized on the basis of the mechanism of internal charge transfer (ICT).

504 citations


Journal ArticleDOI
TL;DR: Versatile dyes based on benzothiadiazole and benzoselenadiazoles chromophores have been developed that perform efficiently in dye-sensitized solar cells.

440 citations


Journal ArticleDOI
TL;DR: A task-specific ionic liquid, [bmIm]OH, has been introduced as a catalyst and as a reaction medium in Michael addition, which drives the reaction of open-chain 1,3-dicarbonyl compounds with alpha,beta-unsaturated esters and nitriles toward bis-addition to produce exclusively bis-adducts in one stroke.

432 citations


Journal ArticleDOI
TL;DR: The first enantioselective Brønsted acid catalyzed reduction of imines has been developed and this new organocatalytic transfer hydrogenation of ketimines with Hantzsch dihydropyridine as the hydrogen source offers a mild method to various chiral amines with high enantiOSElectivity.

428 citations


Journal ArticleDOI
TL;DR: Emulsion polymerization was examined as a novel route for the synthesis of core/shell superparamagnetic nanoparticles consisting of a highly crystalline gamma-Fe2O3 core and a very thin polymeric shell wall to promote Suzuki cross-coupling reactions.

370 citations


Journal ArticleDOI
TL;DR: The catalytic system derived from a sterically hindered adamantyl-substituted phosphine oxide proves highly efficient and tolerates a number of important functional groups.

324 citations


Journal ArticleDOI
TL;DR: A new fluorescent probe N-butyl-4,5-di[2-(phenylamino)ethylamino]-1,8-naphthalimide 1 senses only Cu(II) among heavy and transition metal (HTM) ions by means of a colorimetric method with a large red-shift in emission attributed to the deprotonation of the secondary amines as a receptor conjugated to the naphthalIMide fluorophore.

320 citations


Journal ArticleDOI
TL;DR: Calixarene-based fluorescent chemosensor 1 with two fluorogenic pyrene units conjugated to amide groups as guest recognition sites is synthesized with enhanced fluorescence intensity and blue-shifted excimer emission.

310 citations


Journal ArticleDOI
TL;DR: Formation of a controlled fullerene mesophase within an organic host system has enabled us to create high-power conversion efficiency photovoltaics.

Journal ArticleDOI
TL;DR: In this paper, N-Heterocyclic carbenes derived from benzimidazolium salts are used as catalysts for generating homoenolate species from alpha, β-unsaturated aldehydes.

Journal ArticleDOI
TL;DR: In this article, a potassium-selective fluorescent BODIPY-linked azacrown ether chemosensor has been synthesized using novel substitution reactions of 3,5-dichloroBODY.

Journal ArticleDOI
TL;DR: The bromopentacenes could be further elucidated to pentacene nitriles, further decreasing the acene's reduction potential, while the charge-carrier mobility in the fluorinated systems was shown to scale with the degree of fluorine substitution.

Journal ArticleDOI
TL;DR: Beta-amino alcohols were formed under mild conditions with high selectivity and in excellent yields byminolysis of a variety of epoxides by aliphatic and aromatic amines in water.

Journal ArticleDOI
TL;DR: Alpha-amino phosphonates were obtained with good to high enantioselectivities in hydrophosphonylation of aldimines with diisopropyl phosphite at room temperature.

Journal ArticleDOI
TL;DR: A unimolecular system functioning as a combinatorial logic circuit for half-subtractor with two functionally integrated logic gates XOR and INHIBIT, allowing unequivocal assignment of logic-0 and logic-1.

Journal ArticleDOI
TL;DR: A method for the palladium-catalyzed arylation of pyridines and pyrazoles has been developed and a bromo substituent is tolerated on the aryl iodide coupling component.

Journal ArticleDOI
TL;DR: Five new urea derivative naphthalene compounds were synthesized by a reaction of 1,8-diaminonaphthalenes and the corresponding isocyanates and showed a distinct color change only when treated with fluoride ions.

Journal ArticleDOI
TL;DR: Three organoboron compounds are shown to be two-photon fluorescent sensors for fluoride anion with high sensitivity and selectivity and the recognition mechanism is attributed to the unique steric structure of the bulky dimesitylboryl group.

Journal ArticleDOI
TL;DR: A series of solution studies in addition to the first X-ray structure of a carbene-alcohol complex support acarbene-base nucleophile activation mechanism.

Journal ArticleDOI
TL;DR: A novel colorimetric and fluorescent chemosensor ADDTU-1 bearing dual receptor sites, which shows specific optical signaling for AcO, H2PO4-, and F- over other anions and dual response toward AcO- andF- via PET and ICT mechanisms, is described.

Journal ArticleDOI
TL;DR: In this article, Cinnamaldehydes and N-sulfonylimines undergo direct annulations to cis-disubstituted γ-lactams via the intermediacy of catalytically generated homoenolates.

Journal ArticleDOI
Yuanhong Liu1, Feijie Song1, Zhiquan Song1, Meina Liu1, Bin Yan1 
TL;DR: Results indicated that both the oxyauration and the proto-demetalation steps are highly stereoselective.

Journal ArticleDOI
TL;DR: Peptides containing a secondary amine and a carboxylic acid in a specific orientation to each other are presented as highly efficient catalysts for asymmetric aldol reactions, and the enantioselectivity of the peptidic catalysts can be changed from (R)- to (S)-selectivity by simple modifications of the secondary structure.

Journal ArticleDOI
TL;DR: The Pd-catalyzed amination of a variety of heteroaryl halides has been accomplished by utilizing bulky electron-rich biaryl phosphine ligands, but the first couplings of amines with chloro- and bromoindoles bearing a free NH are reported.

Journal ArticleDOI
TL;DR: A new probe, 1,4-bis(1-pyrenyl)-2, 3-diaza-1,3-butadiene, selectively senses Hg2+ and Cu2+ through two different channels: the yellow-deep-pink color change and the enhancement of the fluorescence with the red shift of the excimer emission.

Journal ArticleDOI
TL;DR: Rate constants for reaction of alpha-tocopherol, 2,2,5,7,8-pentamethyl-6-hydroxychroman, and 2,6-di-tert-butyl-4-methylphenol with 2, 2-diphenyl-1-picrylhydrazyl radical were measured in solvents of different polarity and H-bond basicity.

Journal ArticleDOI
TL;DR: It is shown that simultaneous cooling in conjunction with microwave heating prolongs the lifetime of the aryl chloride substrates during the course of the reaction and, as a result, yields of the desired biaryl as well as overall recovery of material can be increased.

Journal ArticleDOI
TL;DR: This discovery, along with the design of a new triazolium precatalyst, enables the catalytic, atom-economical redox esterification of enals.