Electrolytic oxidation of ketones in a methanolic solution of sodium cyanide in the presence of catalytic amounts of potassium iodide
摘要:
The indirect electrolytic oxidation of ketones (1) in methanolic sodium cyanide was studied using iodide ion as a mediator. The product and the reactivity of ketone were dependent on the nature of the alkyl groups attached to the carbonyl group. Thus, 2-alkyl and 2,2-dialkyl ketones afforded the corresponding oxiranecarbonitriles 2 along with small amounts of methyl oxiranecarboximidate 3, whereas acetophenones exclusively yielded benzoylpropanedinitriles 4.
CYANOTHIOACETAMIDE DERIVATIVE AND PROCESS FOR PRODUCING THE SAME
申请人:NIPPON SODA CO., LTD.
公开号:EP1367049A1
公开(公告)日:2003-12-03
A thioacetamide compound represented by the formula (1) (1) which is useful as an intermediate for an acrylonitrile derivative serving as an active ingredient for medicines and agricultural chemicals, especially insecticides/acaricides; a process for producing the compound; and a process for producing a 3-oxo-2-(2-thiazolyl)propanenitrile compound, characterized by reacting the compound represented by the formula (1) with phenacyl halide.
Preparation of 4,6-diaminopyrazolo[3,4-<i>d</i>] pyrimidines with variations in substitution at the 1- and 3-positions
作者:Philip L. Southwick、Balram Dhawan
DOI:10.1002/jhet.5570120621
日期:1975.12
of new derivatives of 4,6-diaminopyrazolo[3,4-d]pyrimidines substituted in the 1- and/or 3-positions have been obtained from reactions of guanidine carbonate with 1- and/or 3-substituted-5-amino-4-cyanopyrazoles. Use of triethanolamine as a reaction medium permitted preparation of certain derivatives which could not be obtained from the previously described fusion procedure. Some derivatives of 4-aminopyrazolo[3
从碳酸胍与1-和/或3-取代的-5-的反应中获得了许多在1-和/或3-位被取代的4,6-二氨基吡唑并[3,4- d ]嘧啶的新衍生物。氨基-4-氰基吡唑。使用三乙醇胺作为反应介质允许制备某些衍生物,这些衍生物不能从前述的融合方法中获得。还从甲酰胺与相同的5-氨基-4-氰基吡唑的反应中获得了在1-和/或3-位被取代的4-氨基吡唑并[3,4- d ]嘧啶的一些衍生物。筛选了新化合物的体内抗疟活性,但发现它们没有活性。
Converting a weaker ATP-binding site inhibitor into a potent hetero-bivalent ligand by tethering to a unique peptide sequence derived from the same kinase
作者:Samanth Reddy Kedika、D. Gomika Udugamasooriya
DOI:10.1039/c8ob01406j
日期:——
binding site directed moiety or a ligand to an ATP-binding site inhibitor has been used as a strategy to increase kinase binding affinity and specificity. The moieties typically used here as the second binding partner are varied from simple organic groups to ligands such as peptides derived from substrate binding site sequences. So far these hetero-bivalent ligands were developed targeting additional
Cyanothioacetamide derivative and process for producing the same
申请人:——
公开号:US20040059122A1
公开(公告)日:2004-03-25
A thioacetamide compound represented by the formula (1) which is useful as an intermediate for an acrylonitrile derivative serving as an active ingredient for medicines and agricultural chemicals, especially insecticides/acaricides; a process for producing the compound; and a process for producing a 3-oxo-2-(2-thiazolyl)propanenitrile compound, characterized by reacting the compound represented by the formula (1) with a phenacyl halide.
1
Application of time-variable feedback to the input amplifier of pulse magnetic resonance spectrometers: Experimental studies
作者:A. V. Koptioug、E. J. Reijerse、A. A. K. Klaassen
DOI:10.1007/bf03166126
日期:2002.12
Experimental research on the improvement of the sensitivity and time resolution of pulsed magnetic resonance spectrometers is discussed. It is shown that application of a time-variable feedback of a signal to the input of the receiver amplifier can decouple the "fixed" relationship between the quality factor Q and the ringdown time of the resonance system. Experiments were performed with low-frequency, radio-frequency and microwave pulse-type magnetic resonance receivers. Modifications of an S/C-band electron spin echo modulation spectrometer carried out to check the "time-variable feedback" performance are described. It is demonstrated that the application of a time-variable feedback can significantly reduce the ringdown time and improve the recovery properties of the magnetic resonance receiver system. It is also demonstrated that the time-variable feedback can improve the overall receiver sensitivity due to the fact that the working bandwidth of the resonance system can be optimized separately for the transmitting and the receiving mode. Signal values could be increased at least three times and the signal-to-noise ratio about 1.5-2 times. The largest improvement is achieved with the initially overcoupled resonator. Experimental spectra of test samples for different settings of the time-variable feedback are shown.