4-Hydroxy-3-phenylpyridin-2 (1H)-ones with different substituents either at N-1 or in the phenyl group were synthesized by reaction of ethyl-beta-aminocrotonates with dialkyl malonates or 'magic malonates' (2,4,6-trichlorophenyl malonates). The evaluation of these compounds on Mycobacterium tuberculosis H37Ra, Escherichia coli B and Staphylococcus aureus ATCC 25923 showed significant inhibitory effects on M tuberculosis (5g and 5s, MIC = 8-mu-g/ml). A structure-activity relationship is discussed.
The CSIC [Carbanion mediated Sulfonate (Sulfonamido) Intramolecular Cyclization] reaction: Scope and limitations
作者:JoséL Marco、S.T Ingate、P.M Chinchón
DOI:10.1016/s0040-4020(99)00379-8
日期:1999.6
The CSIC (Carbanion-mediated Sulfonate -Sulfonamide- Intramolecular Cyclization) reaction has been extended to new carbonyl containing substrates, showing the scope and limitations of this process. Suitable derivatives of ketones (e.g acetophenone (1)), β-keto esters (e.g ethyl acetoacetate (4)), γ-keto esters (e.g ethyl 2-oxocyclohexaneacetate (5) and ethyl levulinate (6)) proved reluctant to undergo
A Convenient Synthesis of N1-Substituted 3,4-Dihydropyrimidin-2(1<i>H</i>)-ones by Cyclocondensation of α-Chlorobenzyl Isocyanates with Ethyl <i>N</i>-alkyl(aryl)-β-aminocrotonates
A new convenient approach to the synthesis of N1-sub-stituted 3,4-dihydropyrimidin-2(1H)-ones was developed using the regioselective cyclocondensation of α-chlorobenzyl isocyanates with ethyl N-alkyl(aryl)-β-aminocrotonates. A number of Nl-aryl and N1-alkyl substituted Biginelli compounds difficult to obtain by other methods were prepared with high yields.
Transition-metal-free direct trifluoromethylthiolation of electron-rich aromatics using CF3SO2Na in the presence of PhPCl2
作者:Xia Zhao、Xiancai Zheng、Miaomiao Tian、Jianqiao Sheng、Yifan Tong、Kui Lu
DOI:10.1016/j.tet.2017.11.019
日期:2017.12
A novel transition metal-free route for the direct trifluoromethylthiolation of electron-rich aromatics using CF3SO2Na in the presence of PhPCl2 was developed. More specifically, PhPCl2 was used as both a reducing and a chlorinating reagent for the first time in this CF3SO2Na-based trifluoromethylthiolation reaction. The absence of transition metals and the use of cheap and readily available reagents
开发了一种新颖的无过渡金属的路线,该路线用于在PhPCl 2存在下使用CF 3 SO 2 Na直接进行富电子芳族化合物的三氟甲基硫醇化。更具体地,在基于CF 3 SO 2 Na的三氟甲基硫醇化反应中,PhPCl 2首次被用作还原剂和氯化剂。过渡金属的缺乏以及廉价和容易获得的试剂的使用使该方法成为富电子芳族化合物三氟甲基硫醇化的替代和实用策略。
1,4,9,10-Anthradiquinone as precursor for antitumor compounds
作者:Lothar Werner Schenck、Krystina Kuna、Walter Frank、Antje Albert、Christian Asche、Uwe Kucklaender
DOI:10.1016/j.bmc.2006.01.026
日期:2006.5
5-hydroxyindoles were not obtained from this diquinone. It yielded similar reaction products of the Nenitzescu reaction like other quinones activated by two electron-withdrawing groups. Furthermore, these new compounds 8A were found to constitute precursors for the synthesis of azonines. The conversion to dibenzoazonines 13 occurred in an unusual and up to now unknown way consisting of isomerization, ring opening
In order to obtain N-benzyl-3,5-dicarbethoxy-2,6-dimethyl-4-phenyl-1,4-dihydropyridine 1 as a lead compound of pharmacological interest, the classical Hantzsch synthetic method and the modified Collie procedure were used. However, only a very low yield of 1 was obtained in a mixture with larger amounts of some by-products (2, 3, 4). Compound 1 was then synthesized in satisfactory yield via a different