作者:
Omar K. AI-DuaijChemistry Department
College of Science A l-Imam Mohammad Ibn Saud Islamic University (1MSIU) Riyadh I1623 Kingdom ofSaudi Arabia
Novel conditions have been developed for the preparation of substituted 2-aminothiophenes employing the knoevenagel condensation followed by the Gewald reaction. The benefits of these conditions are their mildness, an...
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Novel conditions have been developed for the preparation of substituted 2-aminothiophenes employing the knoevenagel condensation followed by the Gewald reaction. The benefits of these conditions are their mildness, and the ease of product isolation. Thus, the knoevenagel condensation is run in the presence of sodium hydroxide and least amount of ethanol, (in domestic microwave) which combine to perform the roles of desiccant, and catalyst. The Gewald reaction is performed with inorganic base in Ethanol, which suppresses by product formation. This process has been employed in the synthesis of N-nucleosides as a tumor inhibitor.
A versatile synthetic approach toward a series of benzothiazepines with medicinal potential (for example, compound 1) that allows incorporation of structural variation at the three aromatic regions of the structure, a...
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A versatile synthetic approach toward a series of benzothiazepines with medicinal potential (for example, compound 1) that allows incorporation of structural variation at the three aromatic regions of the structure, and at the sulfur atom, was developed. knoevenagel condensation of indan-1,3-diones with benzaldehydes, yielded 2-benzylidineindan-1,3-diones, which undewent thio-Michael addition and intramolecular imine formation upon reaction with 2-aminothiophenols, to produce the target benzothiazepines. Use of indan-1,3-diones, benzaldehydes or 2-aminothiophenols bearing further substitution enabled production of novel 5,11-dihydro-12H-benzo[b]indeno [1,2-e][1,4]thiazepin-12-one analogs 1 - 14, including compounds bearing substitution at novel positions within the scaffold.
A new microporous negatively charged MOF,FJI-C2,was successfully synthesized by a solvethermal method,and structurally characterized using a variety of different technique,including X-ray diffraction(XRD),Powder X-r...
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A new microporous negatively charged MOF,FJI-C2,was successfully synthesized by a solvethermal method,and structurally characterized using a variety of different technique,including X-ray diffraction(XRD),Powder X-ray diffraction(PXRD),Elementary analysis(EA),FI-IR,TGA ***-C2 exhibits highly selective adsorption and separation of cationic dye(methylene blue for example)in DMF solution through an anion-exchange *** selectivity of FJI-C2 for dyes could be attributed to the anionic framework,in which the[(CH3)2NH2]+cations can be exchanged with cationic *** confirm that selectivity absorption is due to ionic interaction of dye with the anionic framework,dye releasing experiment was performed in DMF,a saturated solution of Na Cl in DMF or a saturated solution of TMAB(Tetra Methyl Ammonium Bromide)in ***,FJI-C2 was also used as an efficient heterogeneous catalyst for knoevenagel condensation *** conversion was achieved under mild *** FJI-C2 catalyst could be facilely separated from the reaction mixture,and could be reused without significant degradation in catalytic activity.
Brodimoprim (1) is a new antibacterial benzylpyrimidine with a broad spectrum of antimicrobial activities. An improved synthetic method of (1) was reported in this paper from 4-bromo-3,5-dimethoxybenzaldehyde (2) ...
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Brodimoprim (1) is a new antibacterial benzylpyrimidine with a broad spectrum of antimicrobial activities. An improved synthetic method of (1) was reported in this paper from 4-bromo-3,5-dimethoxybenzaldehyde (2) through knoevenagel condensation, 1,3-prototropic isomerization and cyclization with overall yield of 53.8% which was 40.2% in the early report. As a key intermediate, cinnamonitrile (3) was prepared by the condensation of 2 with 3- methoxypropan-enitrile, which was generated in situ from acrylonitrile with methanolic sodium methoxide. It was found that 3 could be converted easily into the corresponding benzyl isomer 4 by reacting with ethylene glycol monomethyl-ether. 4 reacted with guanidine to give 1 without isolation and purification.……
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