61327-27-3Relevant academic research and scientific papers
Ru-Catalyzed Selective Catalytic Methylation and Methylenation Reaction Employing Methanol as the C1 Source
Biswas, Nandita,Srimani, Dipankar
, p. 10544 - 10554 (2021/07/31)
Methanol can be employed as a green and sustainable methylating agent to form C-C and C-N bonds via borrowing hydrogen (BH) methodology. Herein we explored the activity of the acridine-derived SNS-Ru pincer for the activation of methanol to apply it as a C1 building block in different reactions. Our catalytic system shows great success toward the β-C(sp3)-methylation reaction of 2-phenylethanols to provide good to excellent yields of the methylated products. We investigated the mechanistic details, kinetic progress, and temperature-dependent product distribution, which revealed the slow and steady generation of in situ formed aldehyde, is the key factor to get the higher yield of the β-methylated product. To establish the environmental benefit of this reaction, green chemistry metrics are calculated. Furthermore, dimerization of 2-naphthol via methylene linkage and formation of N-methylation of amine are also described in this study, which offers a wide range of substrate scope with a good to excellent yield.
Copper-Catalyzed (4+1) Cascade Annulation of Terminal Alkynes with 2-(Tosylmethyl)anilines: Synthesis of 2,3-Disubstituted Indoles
Yan, Xu,Liu, Chun-Fang,An, Xian-Tao,Ge, Xiao-Min,Zhang, Qing,Pang, Lin-Han,Bao, Xu,Fan, Chun-An
, p. 8905 - 8909 (2021/11/24)
A novel strategy based on Cu-catalyzed (4+1) cascade annulation of terminal alkynes as one-carbon synthons with 2-(tosylmethyl)anilines has been developed for the expeditious synthesis of 2,3-disubstituted indoles, in which in situ generations of aza-o-quinone methides and alkynyl-copper(I) species are involved. This annulation provides an effective method for the assembly of synthetically and structurally interesting 2,3-disubstituted indoles.
An efficient iron-promoted synthesis of 6H-indolo[2,3- b] quinolines and neocryptolepine derivatives
Yan, Zicong,Wan, Changfeng,Wan, Jianyong,Wang, Zhiyong
supporting information, p. 4405 - 4408 (2016/06/06)
A facile and practical method for the preparation of 6H-indolo[2,3-b]quinolines and neocryptolepines was developed under the promotion of the easily available ferric trichloride, affording the desired products with moderate to good yields.
Preparation of ortho-hydroxyalkylanilines as ortho-quinone methide imine precursors via an aminoborane complex
Migneault, David,Bernstein, Michael A.,Lau, Cheuk K.
, p. 1506 - 1513 (2007/10/03)
A general process for ortho-specific hydroxyalkylation of secondary anilines has been developed.N-Methylanilinochlorophenylboranes react readily with aryl aldehydes, and with α,β-unsaturated or saturated aliphatic aldehydes to give the corresponding ortho-hydroxyalkylanilines in good yield.Thermolysis of the latter generated the corresponding ortho-quinone methide imine, which can participate in an electrocyclic or intramolecular cycloaddition reaction to give various dihydro- and tetrahydroquinoline derivatives.Application of the method to the syntheses of 5-aza anal ogs of hexahydrocannabinol is demonstrated.Key words: quinone methide imine, ortho-hydroxyalkylaniline, azacannabinoids.
A SYNTHETIC EQUIVALENT FOR ORTHO-LITHIO-N-METHYLANILINE
Sisko, Joseph,Weinreb, Steven M.
, p. 1035 - 1042 (2007/10/02)
o-Bromo-N-methyl-N-n-propoxyaniline undergoes halogen-metal exchange with butyllithium and the resulting lithio species reacts cleanly with a variety of electrophiles.The N-O bond of these products can be reduced with Raney nickel to afford ortho-substituted-N-methylanilines.
SELECTIVE REDUCTION OF KETONES WITH SODIUMBOROHYDRIDE-ACETIC ACID
Nieminen, Tuula, E. A.,Hase, Tapio A.
, p. 4725 - 4728 (2007/10/02)
Aliphatic ketones, and aromatic ketones having o-hydroxy or o-amino substituents are reduced rapidly to the alcohols by NaBH4 and acetic acid; other types of ketones react much more slowly.
Carbon Dioxide: A Reagent for the Simultaneous Protection of Nucleophilic Centres and the Activation of Alternative Locations to Electrophilic Attack. Prt III. A New Synthetic Method for the ortho-Substitution of N-Monoalkylanilines
Katritzky, Alan R.,Fan, Wei-Qiang,Akutagawa, Kunihiko
, p. 4027 - 4034 (2007/10/02)
N-Methyl- and N-ethyl-aniline are regiospecifically converted into a range of ortho-substituted derivatives, using carbon dioxide both for N-protection and as an intermediate carbanion stabilizing group, and t-butyllithium to lithiate the ortho-carbon atom.The rersulting lithium N-(ortho-substituted-phenyl)-N-methyl- and -N-ethylcarbamates undergo smooth acid-catalysed decarboxylation under mild conditions.No alpha-substituted products were detected.
Heterocyclic 8?-Systems, 15. Investigations on Indole 2,3-Oxides: Sythesis of 3-Hydroxyindoles via Intramolecular Wittig-Rearrangement of 1,2-Dihydro-4H-3,1-benzoxazines
Schmidt, Richard R.,Beitzke, Bernhard
, p. 2115 - 2135 (2007/10/02)
Investigations to trap indole 2,3-oxides 11 by base catalyzed ring contraction of 4H-3,1-benzoxazines 3 led in the system KNH2/NH3 to 3-hydroxy-3H-indoles 7.The N-methylbenzoxazinium salts 15, obtained from 3 and FSO3CH3, yielded with ethoxide under kinet
Recyclization of 2-vinylpyridinium quaternary salts
Stupnikova,Kalafat,Klyuev,Marshtupa
, p. 179 - 182 (2007/10/02)
It is shown that in the reaction of 2-vinylpyridinium quaternary salts with methylammonium sulfite under isomerization recyclization conditions a water molecule adds initially to the double bond of the vinyl substituents, after which the resulting carbino
