Showing papers in "Organic Letters in 2010"

TL;DR: Isoindigo, as a new electron acceptor unit for organic electronic materials, was integrated into two low-energy gap oligothiophenes and demonstrates broad absorption through the visible spectrum, along with appropriate energy levels, as desired for light harvesting donors for organic solar cells when blended with [6,6]-phenyl-C(61)-butyric acid methyl ester.

TL;DR: A redox-neutral sequence of C-H vinylation via ortho-rhodation and C-N bond formation of the putative vinyl rhodium intermediate on the oxime nitrogen, where the N-O bond of oxime derivatives could work as an internal oxidant to maintain the catalytic cycle.

TL;DR: A copper-mediated oxidative cross-coupling of aryl- and alkenylboronic acids with (trifluoromethyl)trimethylsilane (Me(3)SiCF(3)) under mild conditions has been developed, which has the potential to introduce trifluorsized groups into advanced, highly functionalized organic molecules.

TL;DR: Novel aza-BODIPY derivatives substituted with heavy atoms such as bromine and iodine were synthesized and their triplet and singlet oxygen generation efficiencies have been investigated, showing absorption in the NIR region with high molar extinction coefficients.

TL;DR: An analysis of reductive quenchers and mechanistic considerations has led to an optimized protocol for the heteroaromatic alkylations, providing products in good yields and regioselectivities, as well as successfully eliminating previously observed competitive side reactions.

TL;DR: A new rhodamines-based derivative bearing a 1,8-naphthalimide group was synthesized as a dual-mode Cu(2+)-selective sensor via the rhodamine ring-opening approach and ratiometric displacement.

TL;DR: Three new diketopyrrolopyrrole (DPP) compounds are shown to be colorimetric and ratiometric red fluorescent sensors for fluoride anions with high sensitivity and selectivity.

TL;DR: The utilization of the photoredox catalyst, tris(2,2'-bipyridyl)ruthenium dichloride, and a household light bulb to effect radical cyclizations onto indoles and pyrroles at room temperature is reported.

TL;DR: A chemosensor bearing a 1,2,3-triazole ring spacer was synthesized for the selective detection of Al(3+) with respect to dual optical and electrochemical changing events.

TL;DR: A flow-through chemistry apparatus has been developed which allows gases and liquids to contact via a semipermeable Teflon AF-2400 membrane and the concept was proven by application to the ozonolysis of a series of alkenes.

TL;DR: The first enantioselective organocatalytic two- and three-component reactions via a domino Knoevenagel/Michael/cyclization sequence with cupreine as catalyst have been developed and will provide promising candidates for chemical biology and drug discovery.

TL;DR: A series of squaramide-based organocatalysts were facilely synthesized and applied as hydrogen bonding organoc atalysts in the enantioselective Michael addition of nitroalkanes to chalcones, affording the desired R or S enantiomers of the products flexibly in high yields with excellent enantiOSElectivities.

TL;DR: The straightforward and efficient synthesis of indolo[2,1-a]isoquinoline derivatives has been achieved by the rhodium-catalyzed aerobic oxidative coupling/cyclization of 2-phenylindoles with alkynes.

TL;DR: Three copillar[5]arenes, pillararenes containing different repeating units, were successfully prepared by co-oligomerization of different monomers by using hydroquinone diethers with appropriate aliphatic chain lengths.

TL;DR: Rh(III)-catalyzed oxidative coupling reactions between benzamides or heteroaryl carboxamides and olefins have been developed and the vinylation product can further undergo a Michael reaction leading to γ-lactam in the case of electron-withdrawing oleFins.

TL;DR: The visual sensitivity of the receptor 2 is remarkable, showing dual color changes from colorless (receptor) to purple followed by blue and a large red shift in emission upon Cu(2+) complexation.

TL;DR: Mechanistic studies revealed ruthenium-catalyzed direct arylations to proceed through reversible C-H bond activation and subsequent rate-limiting oxidative addition with aryl halides, which led to the development of widely applicable well-defined r Ruthenium(II) carboxylate catalysts.

TL;DR: An efficient room-temperature method for the synthesis of 1-sulfonyl-1,2,3-triazoles from in situ generated copper(I) acetylides and sulfonyl azides is described.

TL;DR: The Sonogashira coupling reaction is not catalyzed by AuI/dppe in the absence of Pd complexes, but addition of 0.1 mol % of PD(0) led to efficient cross-coupling reactions.

TL;DR: N-heterocyclic carbene catalyzed oxidative amidations of various aldehydes to the corresponding hexafluoroisopropylesters by using the readily available organic oxidant A are described.

TL;DR: An unprecedented Cu(II)-mediated methylthiolation of aryl C-H bonds under oxidative conditions that employs the widely available DMSO as the methylthiolysis reagent is described.

TL;DR: In this letter, the first pillar[6]arene crystal structure and the first investigation of the host-guest chemistry of pillar[ 6]arenes are reported.

TL;DR: The cationic N-heterocyclic carbene-gold(I) complex catalyzes the formation of tri- and tetrasubstituted pyrroles via the amino-Claisen rearrangement of N-propargyl beta-enaminone derivatives and the cyclization of alpha-allenylBeta- enaminone intermediates.

TL;DR: A new fluorescent chemodosimeter (Rho-Hg1) is reported for single-selective and parts per billion level-sensitive detection of Hg(2+) in natural waters and has little interference from sulfur compounds such as cysteine and glutathione.

TL;DR: A Co(II)-salen based fluorescent sensor (1.Co) that can selectively recognize cyanide anions in 1:2 binding stoichiometry over other anions has been developed.

TL;DR: Catalytic enantioselective alpha-hydrazination of 1,3-dicarbonyl compounds with azodicarboxylates was investigated in the presence of the newly developed hydrogen bonding catalyst, squaramide 3j using low catalyst loading under mild conditions.

TL;DR: A bifunctional organocatalytic asymmetric formal [4 + 2] cycloaddition reaction of Nazarov reagents and methyleneindolinones afforded spiro[4-cyclohexanone-1,3'-oxindoline] derivatives with excellent enantioselectivity (up to 98% ee).

TL;DR: [RhCp*Cl(2)](2) (1-2 mol %) can catalyze the oxidative coupling of N-aryl-2-aminopyridines with alkynes and arylates to give N-( 2-pyridyl)indoles and N-(2- pyridinyl)quinolones, respectively, using Cu(OAc)(2) as an oxidant.

TL;DR: Azole derivatives were synthesized by iron-catalyzed oxidative reactions of azoles and ethers in good to excellent yields.

TL;DR: Ratiometric fluorescence response was achieved for receptor A on binding to CN(-, and this reagent was used for imaging bacterial cells pre-exposed to 1.42 microM CN(-) solution.