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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
T Ercegovic et al.
Organic letters, 3(6), 913-915 (2001-03-27)
The novel promoter system iodine monochloride/silver trifluoromethanesulfonate (ICl/AgOTf) was evaluated with various thioglycoside donors and saccharide acceptors, and O-glycosides were obtained in 46-82% yield. Several practical advantages of the ICl/AgOTf system over known promoter systems were observed, such as convenient
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
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
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
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
Disulfide bond formation in S-acetamidomethyl cysteine-containing peptides by the combination of silver trifluoromethanesulfonate and dimethylsulfoxide/aqueous HCl.
Tamamura H, et al.
Tetrahedron Letters, 34(31), 4931-4934 (1993)
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.
Mesomorphic complexes of silver trifluoromethanesulfonate and silver dodecylsulfate with 2-and 3-fluoro-4-alkoxy-4'-stilbazoles.
Bruce DW and Hudson SA.
Journal of Materials Chemistry, 4(3), 479-486 (1994)
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.
Silver triflate catalyzed synthesis of 3-aminoalkylated indoles and evaluation of their antibacterial activities.
Rao VK, et al.
Organic and Medicinal Chemistry Letters, 1(1), 1-7 (2011)
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
Silver Triflate Catalyzed Cyclopropyl Carbinol Rearrangement for Benzo [b] oxepine and 2H-Chromene Synthesis.
Chan PWH, et al.
European Journal of Organic Chemistry, 2015(20), 4447-4456 (2015)
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
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
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
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.
The glucosylation of several alcohols with tetra-O-benzyl-. ALPHA.-D-glucopyranose and a mixture of p-nitrobenzenesulfonyl chloride, silver trifluoromethanesulfonate, and triethylamine.
Koto S, et al.
Bulletin of the Chemical Society of Japan, 53(6), 1761-1762 (1980)
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
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.
P.J. Garegg et al.
Acta Chemica Scandinavica. Series B, 33, 116-116 (1979)
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
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.
David Crich et al.
Carbohydrate research, 343(10-11), 1858-1862 (2008-04-01)
p-Nitrobenzenesulfenyl chloride is a stable commercially available sulfenyl chloride that, in conjunction with silver triflate, cleanly activates a wide range of thioglycosides for glycosylation at -78 degrees C in CH(2)Cl(2).
Lingyong Jiang et al.
Organic & biomolecular chemistry, 10(40), 8102-8107 (2012-09-06)
A silver triflate-catalyzed tandem reaction of N'-(2-alkynylbenzylidene)hydrazide with pyridyne is presented. Different outcomes are obtained, depending on the pyridynes utilized in the transformation.
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.
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
Atsushi Kinbara et al.
The Journal of organic chemistry, 77(20), 8999-9005 (2012-09-26)
A cationic rhodium(I) complex- or In(OTf)(3)-catalyzed synthesis of phenol derivatives from cyclohex-2-enone having an ethoxycarbonyl-substituted alkyne has been achieved. This reaction proceeds via enolization and an intramolecular Alder-Rickert reaction.
V. Pozsgay et al.
The Journal of Organic Chemistry, 46, 3761-3761 (1981)
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