- A Novel ZnII Complex Bearing Two Monodentate (4-Methoxyphenyl)[(1E, 2E)-3-phenylprop-2-en-1-ilidene] Schiff Bases: Crystal Structure and DFT Study
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A novel ZnII complex bearing two monodentate (4-methoxyphenyl)[(1E, 2E)-3-phenylprop-2-en-1-ilidene] Schiff bases was synthesized and investigated both in the solid state by single-crystal X-ray diffraction, elemental analysis, and FTIR and in
- Cordeiro, Giuliano M.,Hottes, Emanoel,Esteves-Souza, Andressa,Guedes, Guilherme P.,De Sant'Anna, Carlos Maurício R.,Herbst, Marcelo H.
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- Iron-Catalyzed Hydrogen Transfer Reduction of Nitroarenes with Alcohols: Synthesis of Imines and Aza Heterocycles
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A straightforward and selective reduction of nitroarenes with various alcohols was efficiently developed using an iron catalyst via a hydrogen transfer methodology. This protocol led specifically to imines in 30-91% yields, with a good functional group tolerance. Noticeably, starting from o-nitroaniline derivatives, in the presence of alcohols, benzimidazoles can be obtained in 64-72% yields when the reaction was performed with an additional oxidant, DDQ, and quinoxalines were prepared from 1,2-diols in 28-96% yields. This methodology, unprecedented at iron for imines, also provides a sustainable alternative for the preparation of quinoxalines and benzimidazoles.
- Wu, Jiajun,Darcel, Christophe
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p. 1023 - 1036
(2021/01/09)
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- Synthesis of β-Phosphinolactams from Phosphenes and Imines
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Various cis-β-phosphinolactams are synthesized stereoselectively for the first time from imines and diazo(aryl)methyl(diaryl)phosphine oxides under microwave irradiation. Diazo(aryl)methyl(diaryl)phosphine oxides first undergo the Wolf rearrangement to generate phosphenes. Imines nucleophilically attack the phosphenes followed by an intramolecular nucleophilic addition via less steric transition states to give final cis-β-phosphinolactams. C-Styrylimines generally give rise to β-phosphinolactams in higher yields than C-arylimines. The stereoselectivity and proposed mechanism are rationalized by DFT theoretical calculation.
- Fu, Xingyang,Li, Xinyao,Xu, Jiaxi
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supporting information
p. 8733 - 8737
(2021/11/17)
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- Synthesis, characterization, molecular structure and computational study of tetrahedral pentamethylcyclopentadienyl iridacycle complexes with α,β-conjugated Schiff base ligands
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Due to the excellent catalytic activities and phosphorescent properties that iridium complexes display, iridium chemistry has been of great interest for scientific investigation over the past 30 years. Iridium metallacycle analogues (also known as an iridacycles) bearing phenylpyridine (ppy) ligands have been well reported on, whilst complexes with R-phenyl-(3-R-phenylallylidene)amine, which is an α,β-conjugated Schiff base ligand, have not had the same attention, despite the fact that both ligands share a similar coordination mode. In this research, four pentamethylcyclopentadienyl iridacycle complexes, Ir1a-Ir1d, with different α,β-conjugated Schiff base ligands were synthesized from a di-μ-chloro-dichloro-bis-(η5-pentamethylcyclopentadienyl)diiridium(III) precursor. The iridacycle complexes were characterized using spectroscopic techniques and the molecular structures of Ir1ab-Ir1d were determined using X-ray crystallography. The X-ray results revealed that the iridacycle complexes have a tetrahedral geometry, the iridium centre being coordinated through the N[dbnd]C[sbnd]Cα[dbnd]Cβ moiety of the α,β-conjugated Schiff base ligand. Computational calculations with the B3LYP method and with LanL2DZ basis sets indicated that the HOMO-LUMO energy gaps Ir1b-Ir1d were in the range 3.31–3.36 eV. The OMe substituent at the C terminal has a greater impact on the HOMO energy level than the one at the N terminal.
- Daud, Adibah Izzati,Khairul, Wan M.,Liu, Zhi-Qiang,Ong, Kok Tong,Tay, Meng Guan
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- Stereoselective Construction of γ-Lactams via Copper-Catalyzed Borylacylation
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A versatile and highly stereoselective borylative cyclization to generate polyfunctionalized γ-lactams has been developed. The stereoselective synthesis of these key ring systems is crucial due to their ubiquity in natural products. We report the diastero- and enantioselective construction of di- and trisubstituted γ-lactam cores, with examples containing an enantioenriched quaternary carbon.
- Bajohr, Jonathan,Lautens, Mark,Polishchuk, Iuliia,Torelli, Alexa,Whyte, Andrew
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supporting information
p. 7915 - 7919
(2020/11/02)
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- Promoting Frustrated Lewis Pairs for Heterogeneous Chemoselective Hydrogenation via the Tailored Pore Environment within Metal–Organic Frameworks
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Frustrated Lewis pairs (FLPs) have recently been advanced as efficient metal-free catalysts for catalytic hydrogenation, but their performance in chemoselective hydrogenation, particularly in heterogeneous systems, has not yet been achieved. Herein, we demonstrate that, via tailoring the pore environment within metal–organic frameworks (MOFs), FLPs not only can be stabilized but also can develop interesting performance in the chemoselective hydrogenation of α,β-unsaturated organic compounds, which cannot be achieved with FLPs in a homogeneous system. Using hydrogen gas under moderate pressure, the FLP anchored within a MOF that features open metal sites and hydroxy groups on the pore walls can serve as a highly efficient heterogeneous catalyst to selectively reduce the imine bond in α,β-unsaturated imine substrates to afford unsaturated amine compounds.
- Niu, Zheng,Zhang, Weijie,Lan, Pui Ching,Aguila, Briana,Ma, Shengqian
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supporting information
p. 7420 - 7424
(2019/04/27)
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- Development of Chiral Spiro Phosphoramidites for Rhodium-Catalyzed Enantioselective Reactions
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A series of 1,1′-spirobiindane-7,7′-diol (SPINOL) analogues bearing a 2,2′-dimethyl-, cyclopentyl-, or cyclohexyl-fused ring were synthesized, and their distinct structural features were elucidated by X-ray crystallography. On the basis of these scaffolds, chiral monophosphoramidite ligands 6 a–m were synthesized, which demonstrated excellent enantioselectivity in RhI-catalyzed asymmetric hydrogenation of a dehydro amino acid methyl ester. Ligands 6 a–m were also successfully applied in the RhI-catalyzed enantioselective [4+2] cycloaddition of α,β-unsaturated imines with isocyanates, which afforded the corresponding pyrimidinones in good yields (60–92 %) with high enantioselectivities (75–92 % ee).
- Zheng, Zhiyao,Cao, Yuxi,Zhu, Dongsheng,Wang, Zheng,Ding, Kuiling
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supporting information
p. 9491 - 9497
(2019/04/08)
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- Iron-Catalyzed Reductive Ethylation of Imines with Ethanol
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The borrowing hydrogen strategy has been applied to the ethylation of imines with an air-stable iron complex as precatalyst. This approach opens new perspectives in this area as it enables the synthesis of unsymmetric tertiary amines from readily available substrates and ethanol as a C2 building block. A variety of imines bearing electron-rich aryl or alkyl groups at the nitrogen atom could be efficiently reductively alkylated without the need for molecular hydrogen. The mechanism of this reaction, which shows complete selectivity for ethanol over other alcohols, has been studied experimentally and by means of DFT computations.
- Vayer, Marie,Morcillo, Sara P.,Dupont, Jennifer,Gandon, Vincent,Bour, Christophe
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supporting information
p. 3228 - 3232
(2018/03/13)
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- Silylative Reductive Amination of α,β-Unsaturated Aldehydes: A Convenient Synthetic Route to β-Silylated Secondary Amines
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Described here is a reductive amination/hydrosilylation cascade of α,β-unsaturated aldehydes mediated by a Lewis acidic borane catalyst. The present reaction system provides an one-pot synthetic route towards β-silylated secondary amines that have not been accessible by other previous catalysis. Comparative 1H NMR studies on the silylative reduction of enimines revealed that steric bulkiness of primary amine reactants strongly affects both catalytic efficiency and regioselectivity. This strategy was applicable to a broad range of substrates and amenable to one-pot gram-scale synthesis. Moreover, a diastereoselective introduction of the β-silyl group was also found to be feasible (d.r. up to 71:29).
- Kim, Eunae,Park, Sehoon,Chang, Sukbok
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p. 5765 - 5769
(2018/03/28)
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- Stereoselective synthesis, spectroscopic and X-ray crystallographic characterization of novel trans- and cis-3-methylseleno substituted monocyclic β-lactams: Potential synthons for C-3 functionalized/bicyclic/halospiroseleno-β-lactams of medicinal interes
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New series of trans- and cis-3-methylseleno substituted β-lactams (4, 5) have been prepared from 2-methylselenoethanoic acid (2). The four-membered β-lactam ring was introduced by the condensation reaction between ketene retrieved from 2-methylselenoethan
- Bhalla, Aman,Nagpal, Yogesh,Berry, Shiwani,Narula, Dipika,Bari,Bhasin,Kumar, Rajeev
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p. 172 - 182
(2018/03/24)
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- Efficient Synthesis of Amines by Iron-Catalyzed C=N Transfer Hydrogenation and C=O Reductive Amination
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Here we report the catalytic transfer hydrogenation (CTH) of non-activated imines promoted by a Fe-catalyst in the absence of Lewis acid co-catalysts. Use of the (cyclopentadienone)iron complex 1, which is much more active than the classical ‘Kn?lker complex’ 2, allowed to reduce a number of N-aryl and N-alkyl imines in very good yields using iPrOH as hydrogen source. The reaction proceeds with relatively low catalyst loading (0.5–2 mol%) and, remarkably, its scope includes also ketimines, whose reduction with a Fe-complex as the only catalyst has little precedents. Based on this methodology, we developed a one-pot CTH protocol for the reductive amination of aldehydes/ketones, which provides access to secondary amines in high yield without the need to isolate imine intermediates. (Figure presented.).
- Facchini, Sofia Vailati,Cettolin, Mattia,Bai, Xishan,Casamassima, Giuseppe,Pignataro, Luca,Gennari, Cesare,Piarulli, Umberto
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supporting information
p. 1054 - 1059
(2018/01/27)
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- Synthesis, structure-activity relationships and preliminary mechanism study of N-benzylideneaniline derivatives as potential TLR2 inhibitors
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Toll-like receptor 2 (TLR2) can recognize pathogen-associated molecular patterns to defense against invading organisms and has been represents an attractive therapeutic target. Until today, none TLR2 small molecule antagonist have been developed in clinic
- Cai, Shaoyi,Zhu, Gengzheng,Cen, Xiaohong,Bi, Jingjie,Zhang, Jingru,Tang, Xiaoshan,Chen, Kun,Cheng, Kui
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p. 2041 - 2050
(2018/03/13)
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- Modular access to vicinally functionalized allylic (thio)morpholinonates and piperidinonates by substrate-controlled annulation of 1,3-azadienes with hexacyclic anhydrides
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A modular substrate-controlled hexannulation of inherently promiscuous 1,3-azadienes with hexacyclic anhydrides, which affords versatile vicinally functionalized allylic lactams, in high yields, regio- and stereoselectivities is described.
- Braunstein, Hannah,Langevin, Spencer,Khim, Monique,Adamson, Jonathan,Hovenkotter, Katie,Kotlarz, Lindsey,Mansker, Brandon,Beng, Timothy K.
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supporting information
p. 8864 - 8872
(2016/10/03)
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- Zn-Catalyzed Enantio- and Diastereoselective Formal [4 + 2] Cycloaddition Involving Two Electron-Deficient Partners: Asymmetric Synthesis of Piperidines from 1-Azadienes and Nitro-Alkenes
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We report a catalytic asymmetric synthesis of piperidines through [4 + 2] cycloaddition of 1-azadienes and nitro-alkenes. The reaction uses earth abundant Zn as catalyst and is highly diastereo- and regioselective. A novel BOPA ligand (F-BOPA) confers high reactivity and enantioselectivity in the process. The presence of ortho substitution on the arenes adjacent to the bis(oxazolines) was found to be particularly impactful, due to limiting the undesired coordination of 1-azadiene to the Lewis acid and thus allowing the reaction to be carried out at lower temperature. A series of secondary kinetic isotope effect studies using a range of ligands implicates a stepwise mechanism for the transformation, involving an initial Michael-type addition of the imine to the nitro-alkene followed by a cyclization event. The stepwise mechanism obviates the electronic requirement inherent to a concerted mechanism, explaining the successful cycloaddition between two electron-deficient partners. (Chemical Equation Presented).
- Chu, John C. K.,Dalton, Derek M.,Rovis, Tomislav
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supporting information
p. 4445 - 4452
(2015/04/14)
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- Insertion of Nitriles into Zirconocene 1-aza-1,3-diene Complexes: Chemoselective Synthesis of N-H and N-Substituted Pyrroles
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The direct insertion of nitriles into zirconocene-1-aza-1,3-diene complexes provides an efficient, chemoselective, and controllable synthesis of N-H and N-substituted pyrroles upon acidic aqueous work-up. The outcome of the reaction (that is, the formatio
- Yu, Shasha,Xiong, Meijun,Xie, Xin,Liu, Yuanhong
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supporting information
p. 11596 - 11599
(2016/02/19)
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- Annulation of α,β-unsaturated imines and alkynes via cobalt-catalyzed olefinic C-H activation
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A cobalt-triarylphosphine catalyst promotes an annulation reaction of an α,β-unsaturated imine and an internal alkyne to afford a polysubstituted dihydropyridine derivative in good yield under mild conditions. The reaction likely involves alkenylation of the olefinic C-H bond via cobalt-mediated nitrogen-assisted C-H activation followed by facile 6π electrocyclization of the resulting azatriene intermediate.
- Yamakawa, Takeshi,Yoshikai, Naohiko
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supporting information
p. 196 - 199
(2013/03/28)
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- Solvent-free synthesis, DNA-topoisomerase II activity and molecular docking study of new asymmetrically N,N′-substituted ureas
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A new series of asymmetrically N,N′-substituted ureas 20-25 was prepared using solvent free conditions, which is an eco-friendly methodology, starting with Schiff bases derived from cinnamaldehyde and p-substituted anilines, which are subsequently submitt
- Andressa, Esteves-Souza,Rodrigues-Santos, Claudio E.,De Nigris Del Cistia, Catarina,Da Silva, Daniel Rosa,Sant'Anna, Carlos Mauricio R.,Echevarria, Aurea
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p. 12882 - 12894
(2013/02/22)
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- An efficient three-component synthesis of homoallylic amines catalysed by MgI2 etherate
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A three-component reaction of aldehydes, amines and allyltributylstannane was efficiently carried out to afford the corresponding homoallylic amine derivatives in the presence of 20 mol% of MgI2 etherate [(MgI 2?(OEt2)n] under mild and neutral reaction conditions in good to excellent yields.
- Wang, Yanping,Liu, Yingshuai,Hu, Shenghui,Zhang, Xingxian
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experimental part
p. 21 - 24
(2012/03/27)
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- One-pot sequence synthesis of azetidin-2-one using diethyl chlorophosphate
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A simple and convenient synthesis of 2-azetidinone derivatives from the reaction of a pre-mixture of amines and aldehydes with carboxylic acids in the presence of diethyl chlorophosphate by [2+2] cycloaddition reaction is described. Separation and purification of imines as intermediates were not required. The methodology is convenient and good to excellent yields of products were obtained with simple purification.
- Zarei, Maaroof
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experimental part
p. 118 - 120
(2012/05/04)
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- GREEN SYNTHESIS OF ARYL ALDIMINES USING ETHYL LACTATE
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The present invention relates to a method for preparing aryl aldimines. In particular, the present invention relates to methods of preparing aryl aldimines that uses environmentally friendly solvent systems.
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Page/Page column 4-5
(2011/08/22)
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- Ethyl lactate as a tunable solvent for the synthesis of aryl aldimines
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Ethyl L-lactate can be tuned with a cosolvent to create polarity conditions ideal for synthesizing aryl aldimines that crystallize directly out of solution within minutes under ambient conditions in excellent yields and requiring no further purification.
- Bennett, Jacqueline S.,Charles, Kaitlyn L.,Miner, Matthew R.,Heuberger, Caitlin F.,Spina, Elijah J.,Bartels, Michael F.,Foreman, Taylor
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body text
p. 166 - 168
(2010/04/22)
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- The Vilsmeier reagent: a useful and versatile reagent for the synthesis of 2-azetidinones
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(Chloromethylene)dimethylammonium chloride (Vilsmeier reagent), prepared easily from N,N-dimethylformamide and oxalyl chloride or thionyl chloride, works as a versatile acid activator reagent for the direct [2+2] ketene-imine cycloaddition of substituted
- Jarrahpour, Aliasghar,Zarei, Maaroof
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experimental part
p. 2927 - 2934
(2009/05/30)
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- Staudinger/aza-Wittig reactions utilizing a novel linear polymer-supported triphenylphosphine as a modified liquid-phase reagent
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A new triphenylphosphine reagent linked to a linear maleimide-styrene copolymer is synthesized and is found to be effective for the formation of a variety of imines via the Staudinger/aza-Wittig reaction. This linear polymer-supported triphenylphosphine h
- Mahdavi, Hossein,Amani, Javad
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experimental part
p. 5923 - 5926
(2010/01/11)
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- Attempted synthesis of 2-azetidinones via ester enolate condensation reactions with imines and thioimidates
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Reaction of the imines 1 and ethyl isobutyrate in the presence of LDA yields β-lactams 2, whereas thioimidate 4 with the same enolate gives the substituted products 5. When phosphorous containing heterocyclic compound 9 is treated with the enolate of ethyl isobutyrate, a mixture of substituted products 10 and 11 is produced. Mechanistic details of these reactions are described.
- Sharma,Saluja, Aarti,Bhaduri, Susmita,Kanwar, Seema
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p. 1964 - 1969
(2007/10/03)
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- Identification and initial structure-activity relationships of a novel class of nonpeptide inhibitors of blood coagulation factor Xa
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The discovery and some of the basic structure-activity relationships of a series of novel nonpeptide inhibitors of blood coagulation Factor Xa is described. These inhibitors are functionalized β-alanines, exemplified by 2a. Docking experiments placing 2a in the active site of Factor Xa implied that the most expeditious route to enhancing in vitro potency was to modify the group occupying the S3 site of the enzyme. Increasing the hydrophobic contacts between the inhibitor and the enzyme in this region led to 8, which has served as the prototype for this series. In addition, an enantioselective synthesis of these substituted β-alanines was also developed.
- Klein, Scott I.,Czekaj, Mark,Gardner, Charles J.,Guertin, Kevin R.,Cheney, Daniel L.,Spada, Alfred P.,Bolton, Scott A.,Brown, Karen,Colussi, Dennis,Heran, Christopher L.,Morgan, Suzanne R.,Leadley, Robert J.,Dunwiddie, Christopher T.,Perrone, Mark H.,Chu, Valeria
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p. 437 - 450
(2007/10/03)
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- Synthesis, Molecular Structure, Fluxional Behavior, and Tricarbonyliron Transfer Reactions of (η4-1-Azabuta-1,3-diene)tricarbonyliron Complexes
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The η4-1-azabuta-1,3-diene)tricarbonyliron complexes 10 are easily prepared in high yield by condensation of the corresponding arylamines 7 with the cinnamaldehydes 8 and subsequent ultrasound-promoted complexation of the resulting 1-azabuta-1,3-dienes 9 with nonacarbonyldiiron. The complexes 10 are shown to represent excellent reagents for the transfer of the tricarbonyliron fragment onto cyclohexa-1,3-diene (1a). The structural characterization for the complexes 10 is achieved by IR, 1H-NMR, and 13C-NMR spectroscopy, as well as X-ray crystallography of 10b, 10c, and 101. Using variable temperature 13C-NMR spectroscopy the fluxionality of the complexes 10a, 10b, 10c, 10e, and 2 is investigated and the activation barrier for the turnstile rotation of the tricarbonyliron fragment is determined. The transfer reaction and the structural factors influencing the transfer of the tricarbonyliron fragment are extensively investigated.
- Knoelker, Hans-Joachim,Baum, Gerhard,Foitzik, Norbert,Goesmann, Helmut,Gonser, Peter,Jones, Peter G.,Roettele, Herbert
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p. 993 - 1007
(2007/10/03)
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- Anti-tumor compounds, pharmaceutical compositions, methods for preparation thereof and for treatment
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The present invention is directed to novel taxanes useful as chemotherapeutic agents or their precursors. Processes for preparing the novel taxanes include coupling reactions, in the presence of a base, of baccatin of formula (III) or (IV) STR1 with β-lac
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- Application of erythro-2-amino-1,2-diphenylethanol as a highly efficient chiral auxiliary. highly stereoselective staudinger-type β-lactam synthesis using a 2-chloro-l-methylpyridinium salt as the dehydrating agent
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The Staudinger-type reaction of carboxylic acids with imines, using a 2-chloro-l-methylpyridinium salt as the dehydrating reagent, proceeded smoothly under mild conditions to afford the desired β-lactams in high yields with excellent cis-selectivity. This
- Matsui, Satoshi,Hashimoto, Yukihiko,Saigo, Kazuhiko
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p. 1161 - 1166
(2007/10/03)
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- Anti-tumor compounds, pharmaceutical compositions, methods for preparation thereof and for treatment
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The present invention is directed to novel taxanes useful as chemotherapeutic agents or their precursors. Processes for preparing the novel taxanes include coupling reactions, in the presence of a base, of baccatin of formula (III) or (IV) STR1 with β-lac
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- Stereoselectivity in the Condensation Reactions between Malate Enolate and Imines to 2-Pyrrolidinone Derivatives
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Enolate dianion of diethyl (S)-malate was stereoselectively condensed with nonenolizable N-arylimines to give 2-pyrrolidinone derivatives.The presence of HMPA changes the diastereoselectivity of this cyclization reaction.
- Ha, Deok-Chan,Yun, Kyeong-Soon,Park, Hye-Sang,Choung, Won-Keun,Kwon, Young-Eun
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p. 8445 - 8448
(2007/10/02)
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- Synthesis of β-lactams by condensation of titanium enolates of 2-pyridylthioesters with imines. Influence of the imine structure on the trans/cis stereoselectivity
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The condensation of the titanium enolates of C-2 alkyl substituted 2-pyridylthioesters with imines affords β-lactams in trans/cis ratios that largely depend on the structure of the C-imine residue. Bulky and non-chelating heteroatom-containing groups lead to the formation of trans β-lactams, while sterically non-requiring or chelating groups favour the formation of the cis-products. On the basis of NMR evidences a rationale is proposed to account for the observed stereoselectivity.
- Annunziata, Rita,Benaglia, Maurizio,Cinquini, Mauro,Cozzi, Franco,Ponzini, Francesco,Raimondi, Laura
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p. 2939 - 2948
(2007/10/02)
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- Process for the production of chiral hydroxy-β-lactams and hydroxyamino acids derived therefrom
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The reaction between a hydroxyacetic acid derivative bearing an oxygen protecting group and a chiral auxiliary group and an imine produces chiral β-lactams. Hydrolysis of the chiral β-lactams produces chiral amino acid analogs.
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- Diastereoselective synthesis of bis-beta-lactams
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Schiff bases derived from (±)-4-aldehydo-2- -azetidinones react with acid chlorides and triethylamine to produce (±)-bis-β-lactams in a diastereoselective fashion. The steric course of β-lactam fonnation was determined in one case by using chiral HPLC sep
- Bose, Ajay K.,Womelsdorf, John F.,Krishnan, Lalitha,Urbanczyk-Lipkowska, Zofia,Shelly, Dennis C.,Manhas, Maghar S.
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p. 5379 - 5390
(2007/10/02)
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- The Reaction of α,β-Unsaturated Aldimines with Benzofuroxan
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Benzofuroxan reacts with imines derived from crotonaldehyde and cinnamaldehyde, to form 2-iminomethylquinoxaline 1,4-dioxides.
- Devi, Purabi,Sandhu, Jagir S.
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p. 427 - 428
(2007/10/02)
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- The synthesis of 3-carboxymethyleneazetidinones
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A series of novel azetidinones bearing the methoxycarbonylmethylene, thioethoxycarbonylmethylene, and alkylaminocarbonylmethylene side chain in their three position have been synthesized from the reaction of the potassium salt of 4,4'-bis(thioethoxy)-3-bu
- Hinz, Werner,Just, George
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p. 1503 - 1507
(2007/10/02)
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- Ruthenium-catalysed Oxidation of Secondary Amines to Imines using t-Butyl Hydroperoxide
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The ruthenium-catalysed oxidation of secondary amines with t-butyl hydroperoxide under mild conditions affords the corresponding imines in high yields.
- Murahashi, Shun-Ichi,Naota, Takeshi,Taki, Hiroshi
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p. 613 - 614
(2007/10/02)
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- Synthesis of New Polycyclic Carbazoloquinones
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Some new policyclic carbazoloquinones, substituted 6H-pyridocarbazoles (V) have been synthesized by the interaction of the Diels-Alder adducts (II), obtained from the addition of cinnamyliden-anils (I) to 4,4-dimethoxyquinone in 1:1 molar ratio, wi
- Hammam, A. S.,Youssef, M. S. K.,Abbady, M. A.,Ibrahim, R. R.
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p. 565 - 570
(2007/10/02)
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