- Synthesis and characterization of mesoporous organosilica supported palladium (SBA-Pr-NCQ-Pd) as an efficient nanocatalyst in the Mizoroki–Heck coupling reaction
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In the present study, the modification of a mesoporous organosilica nanocomposite SBA-15 (Santa Barbara Amorphous 15) was carried out in two steps, first through the surface functionalization of SBA-Pr-NH2 with 2-chloroquinoline-3-carbaldehyde to form SBA-Pr-NCQ, and then through a post-modification process with palladium ions. The target nanocompound structure of SBA-Pr-NCQ-Pd was characterized by different techniques (thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, Energy-dispersive X-ray spectroscopy (EDX), and Fourier transform infrared spectroscopy). The catalytic performance of the porous inorganic–organic hybrid nanocomposite (SBA-Pr-NCQ-Pd) in one of the most important carbon–carbon bond-forming processes, the Mizoroki–Heck coupling reaction of aryl halides and methacrylate in water/ethanol media, was examined. Compared to previous reports, this protocol afforded some advantages, such as high yields of products, short reaction times, catalyst stability without leaching, simple methodology, easy workup, and greener conditions. Also, the nanocatalyst can be easily separated from the reaction mixture and reused several times without a significant decrease in activity and promises economic as well as environmental benefits.
- Moradi, Razieh,Mohammadi Ziarani, Ghodsi,Badiei, Alireza,Mohajer, Fatemeh
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- COMPOUNDS FOR MODULATING DDAH AND ADMA LEVELS, AS WELL AS METHODS OF USING THEREOF TO TREAT DISEASE
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Disclosed are compounds that can modulate DDAH and the amount of asymmetric dimethylarginine (ADMA) in a subject. Also provided are pharmaceutical compositions comprising these compounds, as well as methods of using these compositions to treat and/or prevent diseases associated with elevated or low levels of DDAH and ADMA.
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- Intramolecular Hydroamidation of ortho-Vinyl Benzamides Promoted by Potassium tert-Butoxide/N,N-Dimethylformamide
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An intramolecular hydroamidation of ortho-vinyl benzamides had been developed. The reaction was promoted efficiently by potassium tert-butoxide and N,N-dimethylformamide without the need for strong oxidants or transition-metal catalysts. A series of dihyd
- Chen, Zhen-Yu,Wu, Liang-Yu,Fang, Hai-Sheng,Zhang, Ting,Mao, Zhi-Feng,Zou, Yong,Zhang, Xue-Jing,Yan, Ming
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p. 3894 - 3899
(2017/10/07)
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- Copper-Catalyzed Amino Lactonization and Amino Oxygenation of Alkenes Using O-Benzoylhydroxylamines
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A copper-catalyzed amino lactonization of unsaturated carboxylic acids has been achieved as well as the analogous intermolecular three-component amino oxygenation of olefins. The transformation features mild conditions and a remarkably broad substrate sco
- Hemric, Brett N.,Shen, Kun,Wang, Qiu
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p. 5813 - 5816
(2016/06/09)
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- Synthesis of Secondary Unsaturated Lactams via an Aza-Heck Reaction
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The preparation of unsaturated secondary lactams via the palladium-catalyzed cyclization of O-phenyl hydroxamates onto a pendent alkene is reported. This method provides rapid access to a broad range of lactams that are widely useful building blocks in alkaloid synthesis. Mechanistic studies support an aza-Heck-type pathway.
- Shuler, Scott A.,Yin, Guoyin,Krause, Sarah B.,Vesper, Caroline M.,Watson, Donald A.
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supporting information
p. 13830 - 13833
(2016/11/06)
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- A facile and efficient method for the synthesis of N-substituted 3-oxoisoindoline-1-carbonitrile derivatives catalyzed by sulfamic acid
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A new and efficient method for the synthesis of N-substituted 3-oxoisoindoline-1-carbonitrile derivatives by a one-pot, three-component condensation reaction of 2-carboxybenzaldehyde, primary amine, and TMSCN in the presence of 10 mol % sulfamic acid (NH2SO3H) as the catalyst in EtOH under reflux temperature is described. The process is simple and environmentally benign and the catalyst is commercially available and inexpensive. ARKAT-USA, Inc.
- Hu, Ling-Jun,Zhan, Zha-Jun,Lei, Min,Hu, Li-Hong
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p. 189 - 198
(2013/06/27)
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- Expeditious synthesis of 3,4-dihydroisocoumarins and phthalides using the Heck-Matsuda reaction
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Several 3,4-dihydroisocoumarins and phthalides were synthesized by an effective Heck-Matsuda reaction involving an ortho carboxybenzenediazonium salt with a series of styrenes bearing electron donating and electron withdrawing groups, methylvinyl ketone,
- Da Penha, Eduardo T.,Forni, José Augusto,Biajoli, André F.P.,Correia, Carlos Roque D.
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scheme or table
p. 6342 - 6345
(2011/12/21)
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- Benzamidoaldehydes and their use as cysteine protease inhibitors
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Compounds of the formula where R1, R2, R3, X and n are as defined in the description, are inhibitors of cysteine protease.
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- Base-catalyzed ring openings of benzocyclobutenones and -ols
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The base-catalyzed ring opening of a number of isomeric E- and Z-benzylidenebenzocyclobutenones and -ols has been studied in both protic and aprotic solvents.Cleavage of the C1-C2 bond results in the formation of stilbenes with mainly, and at times exclusively, retained stereochemistry.For the alcohols, these results point to an oxyanion-induced carbon-carbon bond cleavage leading to a vinyl anion that is protonated with retention of configuration in the protic solvents rather than to an electrocyclic ring opening to an alkoxy o-quinodimethane.Reaction of the Z isomer of benzylidenebenzocyclobutenol with methyllithium in THF at 20 deg C causes isomerization to the E isomer, cleavage of the C1-C2 bond, and recyclization of the resultant isomerized vinyl anion. - Key words: benzylidenebenzocyclobutenones, base-catalyzed ring opening; benzylidenebenzocyclobutenols, base-catalyzed ring opening.
- Bradley, J. C.,Durst, T.
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p. 1660 - 1665
(2007/10/02)
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- Synthesis of Isocoumarin, 1-Isoquinolone and 4(1H)-Quinolone Derivatives via Seleno-intermediates
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The reaction of 2-styrylbenzoic acid 2 with N-phenylselenosuccinimide (N-PPS) affords 3-phenyl-iso-coumarin derivatives 3 and 3,4-dihydro-3-phenyl-4-(phenylseleno)isocoumarins 4 via selenolactonization.The reaction of 2-styrylbenzamides 5 and 1-(2-aminoph
- Izumi, Taeko,Morishita, Nobuya
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p. 145 - 152
(2007/10/02)
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- Analysis of the 13C and 1H Spectra of Mixtures of Benzylidene Derivatives
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The 1H and 13C NMR spectra of methyl (E)-2,3-diphenylprop-2-enoate and methyl (E)-2-(2-phenylethenyl)benzoate resulting from the electrocyclic ring opening of benzocyclobutenone starting materials have been assigned.A combination of direct detection 2D NMR techniques, COSY, HETCOR, and FLOCK, provided the assignments of the 1H and 13C resonances. - Keywords: NMR 1H NMR 13C NMR Benzylidene derivatives
- Bradley, J. C.,Williams, A. J.
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p. 496 - 498
(2007/10/02)
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- Transmission of Polar Effects. Part 21. Alkaline Hydrolysis of the 2'- and 4'-substituted 2-Methoxycarbonyldiphenylacetylenes and (Z)-2'- and -4'- Substituted 2-Methoxycarbonylstilbenes and the Ionisation and Esterification, with Diazodiphenylmethane of t
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The rate coefficients for the alkaline hydrolysis of a series of 2'- and 4'-substituted 2-methoxycarbonyldiphenylacetylenes and (Z)-2-methoxycarbonylstilbenes have been determined in 70percent (v/v) dimethyl sulphoxide-water at both 30.0 and 50.0 deg C an
- Bowden, Keith,Ghadir, Khalaf D. F.
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p. 1333 - 1338
(2007/10/02)
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- Formation od some 3-Aryl-3,4-dihydroisocoumarins by Thermal Ring Closure of Stilbene-2-carboxylic Acids
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When heated at 200 deg C, cis- and trans-4'- and 2'-methoxystilbene-2-carboxylic acids have been converted into the title compounds in varying yields, as has trans-4'-hydroxystilbene-2-carboxylic acid.On the other hand, trans-4'-nitrostilbene-2-carboxylic acid affords 3-(4-nitrobenzyl)phthalide.Mass spectrometry provides a simple method of distinguishing between the dihydroisocoumarins and phthalides.
- Bellinger, Geoffrey C. A.,Campbell, William E.,Giles, Robin G. F.,Tobias, Julius D.
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p. 2819 - 2826
(2007/10/02)
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