17576-39-5Relevant academic research and scientific papers
SUBSTITUTED HETEROARYL COMPOUNDS AND METHODS OF USE
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Paragraph 0437, (2017/03/28)
The present invention provides novel heteroaryl compounds, pharmaceutical acceptable salts and formulations thereof. They are useful in preventing, managing, treating or lessening the severity of a protein kinase-mediated disease. The invention also provides pharmaceutically acceptable compositions comprising such compounds and methods of using the compositions in the treatment of protein kinase-mediated disease.
A kinetic study on ethylaminolysis of phenyl y-substituted-phenyl carbonates: Effect of leaving-group substituents on reactivity and reaction mechanism
Song, Yoon-Ju,Kim, Min-Young,Um, Ik-Hwan
, p. 1722 - 1726 (2013/07/26)
A kinetic study on nucleophilic substitution reactions of phenyl Y-substituted-phenyl carbonates (5a-5j) with ethylamine in 80 mol % H2O/20 mol % DMSO at 25.0 ± 0.1 oC is reported. The plots of kobsd vs. [amine] are linear for the reactions of substrates possessing a strong electron-withdrawing group (EWG) but curve upward for those of substrates bearing a weak EWG, indicating that the electronic nature of the substituent Y in the leaving group governs the reaction mechanism. The reactions have been concluded to proceed through a stepwise mechanism with one or two intermediates (a zwitterionic tetrahedral intermediate T± and its deprotonated form T-) depending on the nature of the substituent Y. Analysis of Bronsted-type plots and dissection of kobsd into microscopic rate constants have revealed that the reactions of substrates possessing a strong EWG (e.g., 5a-5f) proceed through T± with its formation being the rate-determining step, while those of substrates bearing a weak EWG (e.g., 5g-5j) proceed through T± and T-.
Aminolyses of 4-nitrophenyl phenyl carbonate and thionocarbonate: Effect of modification of electrophilic center from C=O to C=S on reactivity and mechanism
Um, Ik-Hwan,Kim, Eun Young,Park, Hye-Ran,Jeon, Sang-Eun
, p. 2302 - 2306 (2007/10/03)
A kinetic study is reported for nucleophilic substitution reactions of 4-nitrophenyl phenyl carbonate (5) and 4-nitrophenyl phenyl thionocarbonate (6) with a series of primary amines. The thiono compound 6 is less reactive than its oxygen analogue 5 toward strongly basic amines but is more reactive toward weakly basic CF3CH2NH2. The Bronsted-type plots obtained from the aminolyses of 5 and 6 are curved downwardly. The reactions are proposed to proceed through a stepwise mechanism with a change in the RDS on the basis of the curved Bronsted-type plots. The microscopic rate constants (k1 and k2/k-1 ratio) associated with the current aminolyses are consistent with the proposed reaction mechanism. The replacement of the C=O bond in 5 by a polarizable C=S group results in a decrease in the k1 value but an increase in the k2/k-1 ratio. Besides, such a modification of the electrophilic center causes a decrease in pKac, defined as the pKa at the curvature center of curved Bronsted-type plots, but does not alter the reaction mechanism. The larger k 2/k-1 ratio for the reactions of 6 compared to those of 5 is proposed to be responsible for the decreased pKac value.
Aminolysis of aryl N-ethyl thionocarbamates: Cooperative effects of atom pairs O and S on the reactivity and mechanism
Oh, Hyuck Keun,Oh, Ji Young,Sung, Dae Dong,Lee, Ikchoon
, p. 5624 - 5629 (2007/10/03)
The aminolysis reactions of aryl N-ethyl thionocarbamates (ETNC/EtHN-C(=S)-OC6H4Z) with benzylamines (XC 6H4CH2NH2) in acetonitrile are investigated at 30.0 °C. The rate of ETNC is slower b
Process for preparing alkyl isocyanates
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, (2008/06/13)
Alkylisocyanates are prepared by reacting a phenol or substituted phenol and phosgene in a halogenated hydrocarbon solvent with aqueous alkali metal hydroxide to produce a corresponding chloroformate, reacting the resulting chloroformate solution with aqueous alkylamine to give a corresponding N-alkylcarbamate which, after solvent is stripped, is then pyrolyzed to yield the alkyl isocyanate. Solvent and the starting phenol may be recovered and recycled to the process.
