Cycloisomerization of acetylenic oximes and hydrazones under gold catalysis: Synthesis and cytotoxic evaluation of isoxazoles and pyrazoles
作者:J C JEYAVEERAN、CHANDRASEKAR PRAVEEN、Y ARUN、A A M PRINCE、P T PERUMAL
DOI:10.1007/s12039-015-0993-9
日期:2016.1
The synthesis of substituted isoxazoles and pyrazoles through a general cycloisomerization methodology has been reported. The capability of gold(III) chloride to promote cycloisomerization of both α, β-acetylenic oximes and α, β-acetylenic hydrazones is the centrepiece of the strategy. A range of acetylenic precursors were investigated to afford 28 examples of the products with good to excellent chemical yields. Selected compounds were screened for their cytotoxic potential towards COLO320 cancer cell lines. The IC50 values of the tested compounds were in the micromolar range, with the best compound, 5-(6-Methoxy-naphthalen-2-yl)-3-phenyl-isoxazole (3h) displaying an IC50 of 38.9 μM. For this compound, the crystal structure in complex with Aurora-A kinase was obtained which revealed details of its binding mode within the active site with a free energy of binding -9.54 kcal/mol.
Rhodium-Catalyzed Successive C–H Bond Functionalizations To Synthesize Complex Indenols Bearing a Benzofuran Unit
作者:Yan-Le Mei、Wei Zhou、Tao Huo、Fang-Shuai Zhou、Jing Xue、Guang-Yi Zhang、Bing-Tao Ren、Cheng Zhong、Qing-Hai Deng
DOI:10.1021/acs.orglett.9b03766
日期:2019.12.6
efficient rhodium-catalyzed redox-neutral annulations of N-phenoxyacetamides and ynones via successive double C-H bond activations has been developed. A series of novel and complex indenols bearing a benzofuran unit were generated with moderate to excellent regioselecetivities undermildconditions. Adding N-ethylcyclohexanamine (CyNHEt) could restrict the formation of the mono C-H bond activation byproduct
Gold(III)-Catalyzed Synthesis of Isoxazoles by Cycloisomerization of α,β-Acetylenic Oximes
作者:P. Perumal、C. Praveen、A. Kalyanasundaram
DOI:10.1055/s-0029-1219342
日期:2010.3
β-acetylenic oximes leading to substituted isoxazoles was achieved using AuCl 3 as catalyst, under moderate reaction conditions. The reaction can be applied to various acetylenic oximes and gives good to excellent yields. The methodology is amenable for the selective synthesis of 3-substituted, 5-substituted or 3,5-disubstituted isoxazoles by simply altering the substituents on the acetylenic oximes.
Functionalization of the “Bay Region” of Perylene in Reaction with 1-Arylalk-2-yn-1-ones Catalyzed by Trifluoromethanesulfonic Acid: One-Step Approach to 1-Acyl-2-alkylbenzo[<i>ghi</i>]perylenes
作者:Marta Głodek、Anna Makal、Damian Plażuk
DOI:10.1021/acs.joc.8b02280
日期:2018.11.16
1-acyl-2-alkylbenzo[ghi]perylenes via functionalization of the “bayregion” of perylene in the reaction with 1-arylalk-2-yn-1-ones catalyzed by trifluoromethanesulfonic acid. We showed that the formation of 1-acyl-2-alkylbenzo[ghi]perylenes from perylene and 1-arylalk-2-yn-1-ones might occur via spontaneous aromatization of 1-acyl-2-alkyl-2a,12a-dihydrogenbenzo[ghi]perylenes by oxidation with dioxygen