碳酸(H 2 CO 3)是生命必不可少的分子(例如,作为碳酸氢盐缓冲液),已在溶液和固态下得到很好的表征,但很长一段时间以来,它一直没有在气相中进行光谱表征由于缺乏方便的制备方法;微波光谱是最近才记录的。在这里,我们提出一个新的和一般方法H的制备2 CO 3和甲基(CH其酯3 OCO 2 2H)通过的二气相热解叔丁基和叔分别丁基甲基酯,碳酸。H 2 CO 3和CH 3 OCO2 H被困在8 K的稀有气体基质中,其红外光谱与在高理论水平下计算得出的光谱[CCSD(T)/ cc-pVQZ以外的焦点分析]非常匹配。尽管光谱也与H 2 CO 3的β-多晶型物上方的气相光谱完全吻合,但对于先前报道的α-多晶型物却并非如此。取而代之的是,高于α‐H 2 CO 3的气相对应于CH 3 OCO 2 H,这为近几十年来对分子H 2 CO 3进行的研究提供了新的思路。
amino acid residue of 1a, compound 12a, that include N-(t-butoxycarbonyl)-L-cysteine, was found to be a potent N-type calcium channel blocker with an IC(50) of 0.61 microM. Thus, L-cysteine was selected as a potential structural motif for further modification. Optimization of C- and N-terminals of L-cysteine using S-cyclohexylmethyl-L-cysteine as a central scaffold led to potent and selective N-type
Synthesis and evaluation of a new series of substituted acyl(thio)urea and thiadiazolo [2,3-a] pyrimidine derivatives as potent inhibitors of influenza virus neuraminidase
作者:Chuanwen Sun、Xiaodong Zhang、Hai Huang、Pei Zhou
DOI:10.1016/j.bmc.2006.08.034
日期:2006.12
A series of substituted acyl(thio)urea and 2H-1,2,4-thiadiazolo [2,3-a] pyrimidine derivatives were prepared and both of their cell culture and enzymatic activity toward influenza virus were tested. Their in vitro neuraminidase inhibitory activities were in good agreement with the corresponding activities in cultured cells and they were evaluated as potent neuraminidase inhibitors. Of the analogues
Correlation of the Rates of Solvolysis of Methyl Chloroformate with Solvent Properties
作者:Dennis N. Kevill、Jong Chul Kim、Jin Burm Kyong
DOI:10.1039/a808929i
日期:——
The specific rates of solvolyis of methyl chloroformate are very well correlated by the extended Grunwald–Winstein equation over a wide range of solvents; the pathway is believed to be predominantly addition–elimination, except that a positive deviation for solvolysis in 90% 1,1,1,3,3,3-hexafluoropropan-2-ol suggests an 80% contribution from an ionisation mechanism.
New Modification of the Intramolecular α-Amidoalkylation for the Synthesis of 2-Acyl-1,2,3,4-tetrahydroisoquinolines
作者:Atanas P. Venkov、Ludmil K. Lukanov
DOI:10.1055/s-1989-27153
日期:——
2-Acyl-1,2,3,4-tetrahydroisoquinolines are obtained from N-methylene- or N-benzylidene-2-phenylethylamines and acyl chlorides or carboxylic acids/thionyl chloride in the presence of potassium iodide at room temperature.
kinesine spindleprotein (KSP) inhibitors based on the pharmacophore we have mapped and the crystal structure of monastrol bound to the target protein. The KSP inhibitory activities of all the designed compounds were tested using cloned Human KSP protein. All thirteen compounds were more potent than the control, monastrol, in Human KSP protein adenosine triphosphatase (ATPase) assays. Three compounds (1b