- A diversity-oriented synthesis of polyheterocycles: Via the cyclocondensation of azomethine imine
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Pd-Catalyzed sequential reactions to afford skeletally diverse molecules are described. The reaction involved azomethine imine formation and a cyclocondensation reaction as individual steps. The methodology provides excellent regio- and stereocontrol. Skeletal diversity was ensured by changing the electrophilic counterpart of azomethine imine. Due to its broader diversity and complexity, the DOS methodology is likely to benefit drug discovery and development in the future.
- Ansari, Arshad J.,Pathare, Ramdas S.,Kumawat, Anita,Maurya, Antim K.,Verma, Sarika,Agnihotri, Vijai K.,Joshi, Rahul,Metre, Ramesh K.,Sharon, Ashoke,Pardasani,Sawant, Devesh M.
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supporting information
p. 13721 - 13724
(2019/09/16)
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- Synthesis of Benzo[4,5]imidazo[2,1-b]thiazole by Copper(II)-Catalyzed Thioamination of Nitroalkene with 1H-Benzo[d]imidazole-2-thiol
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A Copper(II)-catalyzed thioamination of β-nitroalkene with 1H-benzo[d]imidazole-2-thiol has been developed for the synthesis of benzo[4,5]imidazo[2,1-b]thiazole derivatives. A variety of N-fused benzoimidazothiazole derivatives are obtained in high yields through successive C?N and C?S bond formations. This protocol is also applicable to β-substituted β-nitroalkenes to afford 2,3-disubstituted benzoimidazothiazoles. (Figure presented.).
- Jana, Sourav,Chakraborty, Amrita,Shirinian, Valerii Z.,Hajra, Alakananda
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supporting information
p. 2402 - 2408
(2018/05/08)
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- Discovery of a PCAF Bromodomain Chemical Probe
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The p300/CBP-associated factor (PCAF) and related GCN5 bromodomain-containing lysine acetyl transferases are members of subfamily I of the bromodomain phylogenetic tree. Iterative cycles of rational inhibitor design and biophysical characterization led to the discovery of the triazolopthalazine-based L-45 (dubbed L-Moses) as the first potent, selective, and cell-active PCAF bromodomain (Brd) inhibitor. Synthesis from readily available (1R,2S)-(?)-norephedrine furnished L-45 in enantiopure form. L-45 was shown to disrupt PCAF-Brd histone H3.3 interaction in cells using a nanoBRET assay, and a co-crystal structure of L-45 with the homologous Brd PfGCN5 from Plasmodium falciparum rationalizes the high selectivity for PCAF and GCN5 bromodomains. Compound L-45 shows no observable cytotoxicity in peripheral blood mononuclear cells (PBMC), good cell-permeability, and metabolic stability in human and mouse liver microsomes, supporting its potential for in vivo use.
- Moustakim, Moses,Clark, Peter G. K.,Trulli, Laura,Fuentes de Arriba, Angel L.,Ehebauer, Matthias T.,Chaikuad, Apirat,Murphy, Emma J.,Mendez-Johnson, Jacqui,Daniels, Danette,Hou, Chun-Feng D.,Lin, Yu-Hui,Walker, John R.,Hui, Raymond,Yang, Hongbing,Dorrell, Lucy,Rogers, Catherine M.,Monteiro, Octovia P.,Fedorov, Oleg,Huber, Kilian V. M.,Knapp, Stefan,Heer, Jag,Dixon, Darren J.,Brennan, Paul E.
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supporting information
p. 827 - 831
(2017/01/14)
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- Iron-catalyzed tandem one-pot addition and cyclization of the blaise reaction intermediate and nitroolefins: Synthesis of substituted NH-pyrroles from nitriles
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The iron-catalyzed addition and cyclization of the Blaise reaction intermediate and nitroolefins to synthesize highly functionalized NH-pyrroles in a tandem one-pot manner from nitriles has been developed. This reaction shows good functional group tolerance and affords a broad spectrum of substituted NH-pyrroles in good yields. Copyright
- Zhao, Mi-Na,Liang, Hao,Ren, Zhi-Hui,Guan, Zheng-Hui
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supporting information
p. 221 - 226
(2013/03/13)
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- Enzymatic enantiomeric resolution of phenylethylamines structurally related to amphetamine
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Both enantiomers of several phenylethylamines, structurally related to amphetamine, have been prepared in good yields and excellent enantiomeric purity by enzymatic kinetic resolution using CAL-B and ethyl methoxyacetate as the acyl donor. In the case of the 4-hydroxyderivative of amphetamine (compound 4i), the S enantiomer racemized possibly in a dynamic kinetic resolution (DKR) under the enzymatic conditions used. The Royal Society of Chemistry 2011.
- Munoz, Lourdes,Rodriguez, Anna M.,Rosell, Gloria,Bosch, M. Pilar,Guerrero, Angel
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experimental part
p. 8171 - 8177
(2012/01/04)
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- UV-absorbers for ophthalmic lens materials
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UV absorbing monomers that are particularly useful in ophthalmic devices are disclosed.
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Page/Page column 6
(2011/02/26)
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- Ambiphilic dual activation role of a task-specific ionic liquid: 2-hydroxyethylammonium formate as a recyclable promoter and medium for the green synthesis of β-nitrostyrenes
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A cost-effective task-specific ionic liquid, 2-hydroxyethylammonium formate, efficiently promotes the condensation of nitroalkanes with various aldehydes to produce β-nitrostyrenes in high to excellent yields at room temperature. This reaction does not involve any hazardous organic solvent and toxic catalyst. The ionic liquid is recovered and recycled for subsequent reactions. In addition, a novel mechanism has been proposed invoking ambiphilic dual activation influence of the ionic liquid.
- Alizadeh, Abdolhamid,Khodaei, Mohammad M.,Eshghi, Ali
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scheme or table
p. 8295 - 8298
(2011/03/17)
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- Spin trapping of alkoxyl radicals generated from 5-methyl and 5-aryl-3-alkoxy-4-methylthiazole-2(3H)-thiones in photochemically induced and microwave-initiated reactions
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Methoxyl and isopropoxyl radicals were generated from N-alkoxy-4,5-dimethylthiazole-2(3H)-thiones (λmax~320 nm) and 5-aryl derivatives (aryl=p-XC6H4; X=MeO, H, AcNH, Cl) (λmax~335 nm) in photochemically and microwave-induced reactions. Alkoxyl radicals were trapped with dimethylpyrrolidine N-oxide and characterized as spin adducts via EPR. Cumyloxyl radicals were liberated in a similar manner from N-cumyloxy-5-(4-methoxyphenyl)-4-methylthiazole-2(3H)-thione. A noteworthy bathochromic shift was found for the lowest energy transition of N-(hydroxy)indeno[2,1-d]thiazole-2(3H)-thione (λmax=376 nm), if compared to the UV-vis absorption of N-hydroxy-4-methyl-5-phenylthiazole-2(3H)-thione (λmax=338 nm). Syntheses of alkoxyl radical precursors and procedures for conducting N,O-homolysis are described in a full account.
- Gro?, Andreas,Schneiders, Nina,Daniel, Kristina,Gottwald, Thomas,Hartung, Jens
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p. 10882 - 10889
(2008/12/23)
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- An efficient solventless synthesis of α-aryl-N-[1-methyl-2-(2/4- chlorophenyl)] ethyl nitrones and their antimicrobial activity
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An efficient solventless synthesis of α-aryl-N-[1-methyl-2-(2/4- chlorophenyl)]ethyl nitrones has been achieved in excellent yield. The compounds are characterized by NMR and X-ray studies. The antimicrobial activities of the synthesized compounds have al
- Amutha, Chinnadurai,Saravanan, Sivaperuman,Dhandapani, Perundurai Subramaniam,Muthusubramanian, Shanmugam,Sivasubramanian, Shanmugaperumal
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p. 276 - 282
(2008/09/20)
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- 2-Benzyl-2-methyl-2H-benzimidazole 1,3-dioxide derivatives: Spectroscopic and theoretical study
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The spectroscopic behavior of 2-benzyl-2-methyl-2H-benzimidazole 1,3-dioxide derivatives in solution was studied in terms of electronic and nuclear magnetic resonance (1H and 13C NMR) techniques. The experimental spectra were compared to the theoretical ones, obtained at DFT level, proving that the compounds adopt in solution a bird-like conformational distribution. Also, theoretically this conformational distribution resulted the most stable in gas phase. Infrared spectroscopy was used to study solid state behavior identifying experimentally the N-O stretching near to 1380, 1365 and 1225 cm-1 and the vibrational benzimidazole skeleton near to 1610 and 1590 cm-1. The vibrational spectrum was satisfactorily described by DFT calculations funding the N-O stretching as a coupled vibration near to 1470, 1350 and 1285 cm-1. The fragmentation that takes place in mass spectrometry was assigned for all of the new derivatives.
- Merlino, Alicia,Boiani, Mariana,Cerecetto, Hugo,Gonzalez, Mercedes
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p. 540 - 549
(2008/02/07)
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- Minute synthesis of electrophilic alkenes under microwave irradiation
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Condensation of carbonyl derivatives 2 with active methylene compounds 1 is efficiently achieved, within 3 to 15 minutes under microwave irradiation by a solvent free reaction in the presence of carefully adjusted amounts of piperidine leading to Knocvenagel products 3 in good to excellent yields.
- Ayoubi,Texier-Boullet,Hamelin
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p. 258 - 260
(2007/10/02)
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- Kinetics of reaction of para-substituted β-nitrostyrenes and β-methyl-β-nitrostyrenes with n-butylamine
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The kinetics of addition of n-butylamine to β-nitrostyrene and β-methyl-β-nitrostyrene and their para-substituted derivatives in acetonitrile at four different temperatures have been followed spectrophotometrically.The order in is unity and in (n-butylamine) it is non-integral.On the basis of the observed kinetic data, a stepwise mechanism involving the formation of zwitterionic addition complex in an equilibrium step followed by conversion into the reaction product via proton transfer in catalytic route by the amine has been proposed.The study of effect of substituents in these reactions shows that the electron-withdrawing substituents accelerate the reaction and electronreleasing substituents retard it.Good Hammett correlations have been observed in both the reaction series.
- Shunmugasundaram, A,Thanulingam, T Lekshmana,Murugesan, R
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p. 609 - 613
(2007/10/02)
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- Porphyrin synthesis from nitrocompounds
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A new porphyrin synthesis starting from nitroalkenes or their equivalents is described. For example, octaethylporphyrin, coproporphyrin, porphyrin-1,2,3,4,5,6,7,8 octapropionic acid, and 2,7,12,17 tetraarylporphyrin are prepared in good yield from readily available materials such as 1-nitropropane, nitroethane, nitromethane, and aldehydes.
- Ono, Noboru,Kawamura, Hisayuki,Bougauchi, Masahiro,Maruyama, Kazuhiro
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p. 7483 - 7496
(2007/10/02)
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- Heterocyclic analogs of amphetamine: Thioureas, dithiocarbamates, and negatively substituted amides
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A series of heterocyclic analogs of amphetamine was synthesized. The heterocycles employed included the 2-furyl, 2-thienyl, 3-methyl-2 thienyl, 3-pyridyl, and 6-methyl-2-pyridyl rings. The aliphatic amine group was converted to the N-methylthiourea, dithiocarbamate, methanesulfonyl, trifluoromethanesulfonyl, and trifluoroacetyl functions since similar conversions of the β-phenethylamine structure had shown blood pressure-lowering effects and some loss of behavioral effects. P-Chlorophenyl and 1-naphthyl analogs were also converted to these derivatives. Behavioral and other biological effects, including antiarthritic, passive cutaneous anaphylactic, and antimicrobial, were observed. The 3-methyl-2-thienyl analog of amphetamine significantly increased papillary muscle contractile force without producing arrhythmias.
- Foye,Tovivich
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p. 591 - 595
(2007/10/04)
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