C:Corrosive;6975-91-3Relevant articles and documents
(meth)acrylate compound
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Paragraph 0051-0053, (2021/03/11)
The invention relates to a (meth)acrylate compound as well as a preparation method and application thereof. The compound has the following structure shown in the specification, and the preparation method is simple. The compound has the advantages of low odor or no odor, low irritation or no irritation, low viscosity, high reactivity and moderate glass transition temperature of the obtained polymer, can participate in free radical polymerization, has favorable flexibility and adhesivity, and can be used in light-cured ink, paint and adhesives.
Electronic and steric substituent influences on the conformational equilibria of cyclohexyl esters: The anomeric effect is not anomalous!
Kleinpeter, Erich,Taddei, Ferdinando,Wacker, Philipp
, p. 1360 - 1368 (2007/10/03)
The cyclohexyl esters of a series of carboxylic acids, RCO2H, spanning a range of electronegativities and quotients of steric hindrance for the R substituent (R = Me, Et, iPr, tBu, CF3, CH2Cl, CHCl2, CH2Br, CHBr2, and CBr3) were prepared. Their conformational equilibria in CD2Cl2 were examined by low-temperature 1H NMR spectroscopy to study the axial or equatorial orientation of the ester functionality with respect to the adopted chair conformation of the cyclohexane ring. The ab initio and DFT geometry-optimized structures and relative free energies of the axial and equatorial conformers were also calculated at the HF/ 6-311G**, MP2/6-311G, and B3LYP/ 6-31G** levels of theory, both in the gas phase and in solution. In the latter case, a self-consistent isodensity polarized continuum model was employed. Only by including electron correlation in the modeling calculations for the solvated molecules was it possible to obtain a reasonable correlation between ΔG°calcd and ΔG°exp. Both the structures and the free energy differences of the axial and equatorial conformers were evaluated with respect to the factors normally influencing conformational preference, namely, 1,3-diaxial steric interactions in the axial conformer and hyperconjugation. It was assessed that hyperconjugative interactions, σC-C/σC-H and σC-O*, together with a steric effect - the destabilization of the equatorial conformer with increasing bulk of the R group - were the determinant factors for the position of the conformational equilibria. Thus, because hyperconjugation is held responsible as the mitigating factor for the anomeric effect in 2-substituted, six-membered saturated heterocyclic rings, and since it is also similarly responsible, at least partly, in these monosubstituted cyclohexanes for a preferential shift towards the axial conformer, the question is therefore raised: can the anomeric effect really be construed as anomalous?
Inhibitors of Cyclic AMP Phosphodiesterase. 4. Synthesis and Evaluation of Potential Prodrugs of Lixazinone (N-Cyclohexyl-N-methyl-4quinazolin-7-yl)oxy>butyramide, RS-82856)
Venuti, Michael C.,Alvarez, Robert,Bruno, John J.,Strosberg, Arthur M.,Gu, Leo,et al.
, p. 2145 - 2152 (2007/10/02)
The cyclic AMP phosphodiesterase (cAMP PDE) inhibitor and cardiotonic agent lixazinone (N-cyclohexyl-N-methyl-4-quinazolin-7-yl)oxy>butyramide, RS-82856, 1) and its acid and base addition salts were found to be insufficiently soluble in formulations suitable for intravenous administration.These results prompted an investigation into potential prodrugs with enhanced aqueous solubility designed to deliver 1 by three distinct mechanisms: (1) decarboxylation of α-carboxamides; (2) hydrolytic loss of a solubilizing N-1-(acyloxy)methyl or (N,N-dialkylamino)methyl moiety; or (3) intramolecular closure of a guanidino ester or amide.The target compounds were evaluated as delivery systems for 1 by three criteria: (1) chemical conversion rate to 1 under physiological conditions; (2) inhibition of type IV cAMP PDE at a fixed time point; and (3) in vivo inotropic activity in anesthetized dogs by both intravenous and oral administration.Release of 1 from 4a (series 1) was found to be too slow to be of value as prodrug of 1, since decarboxylation could be induced only by strong acid, conditions under which hydrolytic ring opening was found to severely compete.Conversely, 1 was released too readily on exposure of (N,N-dialkylamino)methyl derivatives such as 8d (series 2) to physiological conditions, although no large increase in aqueous solubility was realized.Finally, both the physicochemical and in vitro studies indicated that ring closure of the guanidinium esters and amides 17a-k (series 3) to 1 was quantitative and pH- and time-dependent, suggesting the possibility of delivery of the open, water-soluble prodrug form, followed by closure to 1 in plasma.Detailed examination of these agents in vivo, however, demonstrated that only those compounds that rapidly cyclized to 1, as measured by plasma levels of 1, exhibited inotropic activity, indicating that the open prodrug form was not efficiently absorbed upon oral administration.
