Conformational behaviour in S-methyl halothioacetates through NMR, FT-IR, and theoretical calculations
摘要:
这项工作通过NMR和IR光谱以及应用DFT/B3LYP理论的理论计算,对S-甲基氯硫代酸酯(MCTA)、S-甲基溴硫代酸酯(MBTA)和S-甲基碘硫代酸酯(MITA)的构象行为进行了研究。DFT计算显示,在气相中,所有化合物都有两种稳定的旋转异构体: gauche和trans。通过NMR光谱获得偶合常数1JCH,并在溶剂化理论中使用这些常数,计算了气相能量差异、每个旋转异构体的偶合常数、溶液能量差异和每个溶剂的旋转异构体的比例。这些数据表明,对于MCTA,最稳定的旋转异构体是trans;然而,对于MBTA和MITA,最稳定的旋转异构体是gauche,无论是在气相中还是在溶液中。旋转异构体稳定性的变化是由于立体电子相互作用的偏好;在MCTA的情况下,相互作用主要是静电作用,而对于MBTA和MITA,则是由于nBr,I[Formula: see text]π*CO之间的相互作用。关键词:S-甲基卤硫代酸酯,构象分析,理论计算,NMR,溶剂化理论。
A new class of alkylsulfonyl-substituted thiazolide compounds is described. These compounds show strong activity against hepatitis virus.
描述了一类新的烷基亚磺酰基取代的噻唑啉化合物。这些化合物对肝炎病毒表现出强烈的活性。
Design, Synthesis, and Biological Evaluation of 6-Substituted-3-(4-methanesulfonylphenyl)-4-phenylpyran-2-ones: A Novel Class of Diarylheterocyclic Selective Cyclooxygenase-2 Inhibitors
作者:P. N. Praveen Rao、Mohsen Amini、Huiying Li、Amgad G. Habeeb、Edward E. Knaus
DOI:10.1021/jm0302391
日期:2003.11.1
(alkoxy or alkylthio)-4-aryl-3-(4-methanesulfonylphenyl)pyran-2-ones (14a-v), possessing either a H or F substituent at the para-position of the C-4 phenyl ring, were designed for evaluation as selective cyclooxygenase-2 (COX-2) inhibitors with in vivo antiinflammatory-analgesic activities. Although 6-ethylthio-3-(4-methanesulfonylphenyl)-4-phenylpyran-2-one (14s) exhibited a very high in vitro COX-2
A new class of alkylsulfinyl thiazolides is described. These compounds show strong activity against hepatitis viruses.
描述了一类新的烷基亚磺酰基噻唑酮化合物。这些化合物对肝炎病毒表现出强大的活性。
PTC SULFANYLATION OF SOME CARBOXYLIC ACIDS DERIVATIVES ACTIVATed BY α-SULFONYL OR α-SULFINYL GROUP, In SOLID-LIQUID SYSTEM
作者:Blanka Wladislaw、Liliana Marzorati、Claudio L. Donnici、Francisco C. Biaggio、Regina M.A. Neves、Nelson F. Claro
DOI:10.1080/10426509708044209
日期:1997.4.1
Abstract The sulfanylation of α-sulfonyl substituted lactone and thioesters and α-sulfinyl-substituted esters and thioesters, employing solid K2CO3, S-methyl methanethiosulfonate and TEBA, is reported. The results are compared with those in the homogeneous phase and in the non-catalytic two-phase system.
Process for the preparation of 1.R, cis cyclopropane di-carboxylic acid
申请人:Roussel Uclaf
公开号:US05026862A1
公开(公告)日:1991-06-25
A novel process for the preparation of compounds in all their possible isomeric forms of the formula ##STR1## wherein R is selected from the group consisting of hydrogen, alkyl of 1 to 18 carbon atoms, an easily cleavable derivative of the alcohol R-OH and a residue of an alcohol used in the pyrethrinoid series and when Y is --COOR' or --COSR', W is hydrogen and W is halogen when Y is --COOR' and R' is selected from the group consisting of hydrogen, optionally unsaturated alkyl of 1 to 18 carbon atoms and optionally substituted with at least one functional group, aryl optionally substituted with at least one functional group and heterocycle optionally substituted with at least one functional group and when W is hydrogen, the double bond has Z configuration and when W is halogen, the double bond has the E configuration comprising reacting a compound of the formula ##STR2## wherein R has the above definition with a compound of the formula ##STR3## wherein W and Y have the above definitions and A is alkylene of 1 to 18 carbon atoms attached to the two oxygen atoms fixed on the phosphorus atom to obtain a compound of formula I with the double bond having the Z configuration when W is hydrogen and having the E configuration when W is halogen, the cyclopropane and the carboxyl of Y being in both cases in the cis position with respect to the double bond and novel intermediates.