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Showing 1-30 of 32 results for "290068" within Papers
Yu Liu et al.
Organic & biomolecular chemistry, 10(31), 6388-6394 (2012-06-27)
The combination of methyl 3,7-dioxo-2-diazo-4-octenoate from the zinc triflate catalyzed Mukaiyama-Michael reaction of methyl 3-tert-butylsilyloxy-2-diazobutenoate and 4-methoxy-3-buten-2-one with Michael acceptors (methyl vinyl ketone, N-phenylmaleimide, β-nitrovinylarenes) in the presence of a catalytic amount of base provides convenient access to highly substituted
Hua-Dong Xu et al.
Organic letters, 17(1), 66-69 (2014-12-17)
4-N-allylarylpropylamino-1-sulfonyl triazoles are converted to structurally unique benzopyrrolizidinyl sulfonamides in a one-pot operation. Intramolecular capture of rhodium carbene with arylamino nitrogen gives rise to the formation of an ammonium ylide immediate. A [2,3]- or [1,2]-rearrangement occurs to give a 2-allylpyrrolidinyl-2-carbimine
Yusuke Imazaki et al.
Journal of the American Chemical Society, 134(36), 14760-14763 (2012-08-25)
Aryl triflates were transformed to aryl bromides/iodides simply by treating them with LiBr/NaI and [Cp*Ru(MeCN)(3)]OTf. The ruthenium complex also catalyzed the transformation of alkenyl sulfonates and phosphates to alkenyl halides under mild conditions. Aryl and alkenyl triflates undergo oxidative addition
Fergus R Knight et al.
Molecules (Basel, Switzerland), 17(11), 13307-13329 (2012-11-10)
Six silver(I) coordination complexes have been prepared and structurally characterised. Mixed chalcogen-donor acenaphthene ligands L1-L3 [Acenap(EPh)(E'Ph)] (Acenap = acenaphthene-5,6-diyl; E/E' = S, Se, Te) were independently treated with silver(I) salts (AgBF₄/AgOTf). In order to keep the number of variables to
Gang Liu et al.
Chemical communications (Cambridge, England), 48(56), 7049-7051 (2012-06-12)
An unexpected silver triflate-catalyzed tandem reaction of N'-(2-alkynylbenzylidene)hydrazide with ketene through 6-endo-cyclization, [3+2] cycloaddition and rearrangement is reported. This reaction proceeds efficiently to generate the molecular complexity with the formation of four bonds in a one-pot procedure.
Luka S Kovacevic et al.
Angewandte Chemie (International ed. in English), 51(34), 8516-8519 (2012-07-19)
Superelectrophiles: Formamides were designed that when treated with triflic anhydride would be transformed into superelectrophilic amidine dications. These dications were so electrophilic that they underwent in situ dealkylation by the triflate anion (see scheme; Tf = trifluoromethanesulfonyl). DFT calculations were
Sandro Keller et al.
Analytical chemistry, 84(11), 5066-5073 (2012-04-26)
Isothermal titration calorimetry (ITC) is a powerful classical method that enables researchers in many fields to study the thermodynamics of molecular interactions. Primary ITC data comprise the temporal evolution of differential power reporting the heat of reaction during a series
Krystyna Poreba et al.
Advances in clinical and experimental medicine : official organ Wroclaw Medical University, 21(5), 563-571 (2013-01-30)
Derivatives of isoxazolopyridines exhibit diverse biological activity. One method of synthesizing isoxazolo[4,5-b]pyridines is Friedlander condensation. To establish the conditions necessary for conventional and microwave synthesis of new 3,5,6,7-tetrasubstituted isoxazolo[4,5-b]pyridines and their antiproliferative activity. The substrates in the synthesis of new
Zinc triflate as Lewis acid in nucleophilic addition to cyclic N-acyliminium ions
Ronaldo Aloise P et al.
Synlett, 2005, 2297-2300 (2005)
Magnesium and zinc-catalyzed thioketalization
Corey EJ and Shimoji K
Tetrahedron Letters, 24, 169-169 (1983)
Danqing Zheng et al.
Organic letters, 14(11), 2655-2657 (2012-05-24)
An unexpected silver triflate catalyzed reaction of 2-alkynylbenzaldehyde with 2-isocyanoacetate provides an efficient route for the generation of isoquinolines. The reaction proceeds smoothly in air under mild conditions with high efficiency.
Yan-ping Zhu et al.
Organic letters, 14(20), 5378-5381 (2012-10-13)
An I(2)-CF(3)SO(3)H synergistic promoted sp(3) C-H bond diarylation protocol was developed for the synthesis of 2,2-bis(4-(dimethylamino)phenyl)-1-aryl ethanones. The reaction performed well in the absence of any metal and ligand. It integrated three reactions with different mechanisms (iodination, Kornblum oxidation, and
Yasuyuki Muto et al.
Bioscience, biotechnology, and biochemistry, 76(11), 2162-2164 (2012-11-08)
Biotin is one of the most useful tags in (bio)analytical science due to its specific interaction with avidin, but is not easy to convert because of its low solubility in most solvents. Friedel-Crafts acylation of biotin acid chloride in triflic
Akio Saito et al.
Molecules (Basel, Switzerland), 17(9), 11046-11055 (2012-09-15)
In the presence of trifluoromethanesulfonic acid (TfOH) or bis(trifluoromethane-sulfonyl)imide (Tf₂NH), iodosobenzene (PhI=O) efficiently promoted the reactions of dicarbonyl compounds as well as monocarbonyl compounds with nitriles to give 2,4-disubstituted and 2,4,5-trisubstituted oxazole in a single step under the mild conditions.
Dennis M Whitfield
Carbohydrate research, 356, 191-195 (2012-05-01)
That the ring conformation of glycopyranosyl oxacarbenium ions can influence the stereochemical outcome of glycosylation reactions has been postulated for some time. Some new ionization calculations show that the ultimate conformation (4)H(3) or (5)S(1) of D-glucopyranosyl oxacarbenium ions depends on
Lihui Zhu et al.
Organic letters, 15(17), 4496-4499 (2013-08-21)
A facile tandem [2 + 2] cycloaddition and Nazarov reaction has been developed. The combination of In(OTf)3 and benzoic acid was found to synergistically promote the coupling of alkynes and acetals to form 2,3-disubstituted indanones in excellent yield and diastereoselectivity.
B V Subba Reddy et al.
Organic letters, 15(3), 464-467 (2013-01-18)
A novel method has been devised for the synthesis of 2,4,5-trisubstituted pyrrole derivatives through the coupling of α-diazoketones with β-enaminoketones and esters using 10 mol % of Cu(OTf)(2). A wide range of 2,3-disubstituted indole derivatives were also prepared from α-diazoketones
Novel heterogeneous zinc triflate catalysts for the rearrangement of ?-pinene oxide.
Wilson K, et al.
Catalysis Letters, 61(1-2), 51-55 (1999)
Regioselective synthesis of 3-alkylindoles mediated by zinc triflate.
Zhu X and Ganesan A
The Journal of Organic Chemistry, 67(8), 2705-2708 (2002)
Raffaele Cucciniello et al.
ChemSusChem, 9(23), 3272-3275 (2016-11-24)
The present work deals with the production of monoalkyl glyceryl ethers (MAGEs) through a new reaction pathway based on the reaction of glycidol and alcohols catalyzed by Lewis acid-based catalysts. Glycidol is quantitatively converted with high selectivity (99 %) into MAGEs
Shiqiang Yan et al.
Carbohydrate research, 354, 6-20 (2012-05-09)
An efficient, chemoselective, and environment-friendly method for the deprotection of tert-butyldiphenylsilyl ethers mediated by triflic acid supported on silica gel is reported. A wide range of tert-butyldiphenylsilyl ethers derived from carbohydrate and saponin residues can be smoothly cleaved in the
Dennis M Whitfield
Carbohydrate research, 356, 180-190 (2012-04-25)
The Transition State (TS) for any chemical glycosylation reaction is not known with certainty. Both experimental and computational approaches have been limited due to the complexity of the problem. This work describes a preliminary computational ionization approach using density functional
Dahan Eom et al.
Organic letters, 14(21), 5392-5395 (2012-10-26)
Substituted indenes can be synthesized via the Brønsted acid catalyzed cyclization of diaryl- and alkyl aryl-1,3-dienes. In this approach, treatment of symmetric or unsymmetric diaryl- and alkyl aryl-1,3-dienes with a catalytic amount of trifluoromethanesulfonic acid gives a variety of indene
Fumiya Urabe et al.
The Journal of organic chemistry, 78(8), 3847-3857 (2013-04-13)
The stereocontrolled total synthesis of (-)-cinatrin C1, a phospholipase A2 inhibitor, has been accomplished. The key feature includes the stereoselective construction of the highly substituted tetrahydrofuran core by In(OTf)3-catalyzed Conia-ene reaction of the oxygen-tethered acetylenic malonic ester followed by dihydroxylation
Yu Hsien Lin et al.
Chemical communications (Cambridge, England), 48(88), 10910-10912 (2012-10-02)
β-Glycosyl imidinium triflate is generated from participating thioglycoside donors for disarmed-armed iterative glycosylations and one-pot oligosaccharide synthesis.
Dominika Bratkowska et al.
Journal of separation science, 35(15), 1953-1958 (2012-08-07)
Two imidazolium supported ionic liquid phases (SILPs) containing different anions, trifluoromethanesulphonate [CF(3)SO(3)(-)], and tetrafluoroborate [BF(4)(-)], were synthesized and evaluated as solid-phase extraction sorbents for extracting acidic pharmaceuticals from aqueous samples under strong anion-exchange conditions, which include an effective cleanup of
Ping Huang et al.
Organic letters, 14(11), 2790-2793 (2012-05-24)
A silver triflate and palladium acetate co-catalyzed reaction of N'-(2-alkynylbenzylidene)hydrazide with N-allyl ynamide is described, which generates 2-amino-H-pyrazolo[5,1-a]isoquinolines in good to excellent yield. The transformation proceeds with high efficiency through 6-endo cyclization, [3 + 2] cycloaddition, 3,3-sigmatropic rearrangement, and aromatization.
Jeong Hyeon Park et al.
Organic letters, 15(4), 752-755 (2013-02-05)
The palladium-catalyzed diacetoxylation and trifluoromethanesulfonic acid-catalyzed diacetoxylation using inexpensive and environmentally friendly hydrogen peroxide and peracetic acid were successfully conducted with the help of microchemical technology. Excellent yield and selectivity were achieved in significantly shortened reaction times without the decomposition
Su-Xia Xu et al.
Organic & biomolecular chemistry, 11(2), 294-298 (2012-11-29)
A cascade AgOTf-catalyzed chemoselective approach to 3,5/1,3-disubstitued pyrazoles from propargylic alcohols and para-tolylsulfonohydrazide has been developed. Good chemoselectivity is observed depending on the different substituents in the alkyne moiety of the propargylic alcohols, generating two different kinds of products through
Ling Zhang et al.
Chemistry, an Asian journal, 7(8), 1909-1914 (2012-06-08)
Polyfluoroarene reacts with N'-(2-alkynylbenzylidene)hydrazide catalyzed by silver triflate in the presence of cesium carbonate, leading to polyfluoroaryl-fused H-pyrazolo[5,1-a]isoquinolines in good yields.
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