51-19-4Relevant academic research and scientific papers
Cobalt-Catalyzed Deoxygenative Hydroboration of Nitro Compounds and Applications to One-Pot Synthesis of Aldimines and Amides
Gudun, Kristina A.,Hayrapetyan, Davit,Khalimon, Andrey Y.,Segizbayev, Medet,Slamova, Ainur,Zakarina, Raikhan
, (2021/11/30)
The commercially available and bench-stable Co(acac)2 ligated with bis[(2-diphenylphosphino)phenyl] ether (dpephos) was employed for selective room temperature hydroboration of nitro compounds with HBPin (TOF up to 4615 h?1), tolerating halide, hydroxy, amino, ether, ester, lactone, amide and heteroaromatic functionalities. These reactions offered a direct access to a variety of N-borylamines RN(H)BPin, which were in situ treated with aldehydes and carboxylic acids to produce a series of aldimines and secondary carboxamides without the need for dehydrating and/or coupling reagents. Combination of these transformations in a sequential one-pot manner allowed for direct and selective synthesis of aldimines and secondary carboxamides from readily available and inexpensive nitro compounds.
METHOD FOR SYNTHESIZING RAMALIN AND RAMALIN PRECURSOR BY USING GLUTAMIC ACID DERIVATIVE AND HYDROXY ANILINE OR HYDROXY ANILINE HAVING PROTECTED HYDROXY GROUP
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Paragraph 0032; 0033; 0034; 0035; 0036; 0037, (2015/01/18)
Disclosed is a method of the synthesis of ramalin. It comprises reacting a glutamic acid derivative, which is prepared using alkylchloroformate, with a hydrazine salt compound, which is prepared from hydroxy aniline, whether protected or not. The synthesis method allows ramalin, excellent in antioxidant and anti-inflammatory activity, to be simply synthesized at stable yield even without use of a highly toxic solvent such as DMF. In addition, the method is cost competitive, and provides ramalin at high efficiency, thus enabling the mass production of ramalin.
Spectroscopic studies on gallic acid and its azo derivatives and their iron(III) complexes
Masoud, Mamdouh S.,Ali, Alaa E.,Haggag, Sawsan S.,Nasr, Nessma M.
, p. 505 - 511 (2013/12/04)
Azo gallic derivatives and their iron(III) complexes were synthesized and characterized. The stereochemistry and the mode of bonding of the complexes were achieved based on elemental analysis, UV-Vis and IR. The thermal behaviors of the complexes were studied. The effect of pH on the electronic absorption spectra of gallic acid and its azo derivatives are discussed. Different spectroscopic methods (molar ratio, straight line method, continuous variation, slope ratio and successive method) are applied for determination of stoichiometry and pK values for the complex formation of gallic acid with iron(III) in aqueous media. Iron(III) complexes of gallic acid is formed with different ratio: 1:1, 1:2, 1:3 and 1:4 (M:L).
METHOD FOR PREPARING RAMALIN
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Paragraph 0056, (2013/08/28)
The present invention relates to a method for synthesizing ramalin, and more particularly to a method for synthesizing ramalin, which comprises allowing 2-hydrazinylphenol to react with L-glutamic acid having a protected carboxyl group at C-1 and a protected amino group at C-2, and a method for preventing decomposition of the ramalin. According to the present invention, ramalin having excellent antioxidant and anti-inflammatory activities can be synthesized in high yield, and thus can be produced in large amounts. In addition, ramalin can be stably maintained for a long period of time, and thus can be easily used for industrial purposes.
Synthesis and Properties of Some 7-Dimethylamino-1,4-benzoxazin-2-ones
Bris, Marie-Therese
, p. 1275 - 1280 (2007/10/02)
The synthesis of the 7-dimethylamino-1,4-benzoxazin-2-ones (5), fluorescent dyes, by condensing α-ketoacids with 2-amino-5-dimethylaminophenol is described.When the 3-substituent is a methyl group, these compounds can be further condensed with aromatic aldehydes to provide the styryl dyes (6).These products are easily opened by hydrochloric acid in ethanolic solution to afford the corresponding benzalketoacid ethyl esters (7).
