Dysoline, a novel chromone alkaloid isolated from Dysoxylum binectariferum, was reported to have selective cytotoxicity for HT1080 fibrosarcoma cells (IC50 of 0.21 μM). Given the scarcity of natural material, a concise synthesis of (+)-dysoline was developed, allowing for further biological evaluation. An enantioselective nucleophile-catalyzed aldol lactonization formed the piperidine ring with control
Reactions of 2-Mono- and 2,6-Disubstituted 4-Pyrones with Phenylhydrazine as General Method for the Synthesis of 3-(N-Phenylpyrazolyl)Indoles
作者:D. L. Obydennov、B. I. Usachev、V. Ya. Sosnovskikh
DOI:10.1007/s10593-014-1603-3
日期:2015.1
in protic and aprotic solvents, leading to phenylhydrazones of 3-(3-R-1-phenylpyrazol-5-yl)- or 3-(5-R-1-phenylpyrazol-3-yl)pyruvic acids (or esters), respectively. 6-Di(tri)fluoromethylcomanic acids (or esters) reacted analogously, forming the corresponding phenylhydrazones with RF group in the side chain. The obtained phenylhydrazones underwent Fischer reaction under acidic conditions, forming the
Reactions of 4-Pyrones with Azomethine Ylides as a Chemoselective Method for the Construction of Multisubstituted Pyrano[2,3-c]pyrrolidines
作者:Dmitrii L. Obydennov、Vyacheslav D. Steben’kov、Konstantin L. Obydennov、Sergey A. Usachev、Vladimir S. Moshkin、Vyacheslav Y. Sosnovskikh
DOI:10.1055/s-0040-1706032
日期:2021.8
nonstabilized azomethineylides to form pyrano[2,3-c]pyrrolidines in moderate to good yields. The reaction proceeds chemoselectively as a 1,3-dipolarcycloaddition of the azomethineylide at the carbon–carbon double bond of the pyrone activated by the electron-withdrawing substituent. The reactivity of 4-pyrones toward azomethineylides was rationalized by computational studies with the use of reactivity
带有给电子和吸电子基团的4-吡喃酮与不稳定的偶氮甲亚胺基化物反应,以中等至良好的产率形成吡喃并[2,3- c ]吡咯烷。该反应作为由吸电子取代基活化的吡喃酮的碳-碳双键上的偶氮甲基内叶的1,3-偶极环加成反应而化学选择性地进行。通过使用反应性指数的计算研究,使4-吡喃酮对偶氮甲亚胺的反应性合理化。吡喃并[2,3- c ]吡咯烷部分可以被修饰,例如通过在肼的作用下的开环转化以提供吡唑基取代的吡咯烷。
Cycloalkyl derivatives of 3-hydroxy-4-pyridinones field of the invention
申请人:Tam Fat Tim
公开号:US20070082904A1
公开(公告)日:2007-04-12
The present invention provides an cycloalkyl derivative of 3-hydroxy-4-pyridinone which is useful for the chelation of metal ions such as iron. Its preparation and use is described. In particular, the invention concerns the removal of iron in chemical and biological systems including chelating agents having the formula (I); wherein R
1
is X with the proviso that R
2
is y; or R
1
is T with the proviso that R
2
is W; or R
1
is X with the proviso that R
2
R
5
N when taken together form a heterocyclic ring selected from piperidinyl, morpholinyl, pyrrolidinyl or piperazinyl, wherein the group piperidinyl, morphoninyl, pyrrolidinyl or piperazinyl is either unsubstituted or substituted with one to three C
1
to C
6
alkyl groups. X is C
3
-C
6
cycloalkyl; Y is selected from the group consisting of C, to C
6
cycloalkyl; C
1
to C
6
alkyl, and C
1
to C
6
alkyl monosubstituted with a C
3
-C
6
cycloalkyl; T is C
1
to C
6
alkyl; W is C
3
-C
6
cycloalkyl; R
3
is selected from the group consisting of hydrogen and C
1
to C
6
alkyl; R
4
is selected from the group consisting of hydrogen and C
1
to C
6
alkyl; R
5
is selected from the group consisting of hydrogen and C
1
to C
6
alkyl; and its pharmaceutically acceptable salt thereof. Pharmaceutical compositions of such compounds are useful in the removal of excess body iron from patients with iron overload diseases.
[PROBLEMS] Providing a charge control agent that has a negative charge providing property at a practical level, is colorless to light-colored and usable in color toners, produces static charges stable to environmental changes by electrifying the resin powder of a toner and the like, is excellent in storage stability and durability, and is highly safe, as well as a method of controlling the charge of resin powder using the charge control agent, and a toner.
[MEANS OF SOLVING THE PROBLEMS] A charge control agent having a compound represented by the formula shown below as the active ingredient, as well as a method of controlling the charge of resin powder using the charge control agent, and a toner.
X: an oxygen atom or N—H;
Each of R
1
to R
4
: a hydrogen atom, a carboxyl group, an aminocarbonyl group having or not having a substituent, an aminocarbonylmethyl group having or not having a substituent, an alkoxycarbonyl group, an alkyl group, a phenyl group having a substituent or not having a substituent, or a group that forms a saturated or unsaturated ring having or not having a substituent in cooperation with any other group selected from among R
1
to R
4
.