Regioselective alkylation of 2,4-dihydroxybenzyaldehydes and 2,4-dihydroxyacetophenones
作者:Aziza Frank、Negar Hamidi、Fengtian Xue
DOI:10.1016/j.tetlet.2022.153755
日期:2022.4
We report a cesium bicarbonate-mediated alkylation of 2,4-dihydroxybenzyaldehyde and 2,4-dihydroxyacetophenone to generate 4-alkylated products in acetonitrile at 80 °C with excellent regioselectivity, up to 95% isolated yields, and broad substrate scope.
我们报道了碳酸氢铯介导的 2,4-二羟基苯甲醛和 2,4-二羟基苯乙酮的烷基化反应,在 80 °C 的乙腈中生成 4-烷基化产物,具有优异的区域选择性、高达 95% 的分离产率和广泛的底物范围。
Design, synthesis of Cinnamyl-paeonol derivatives with 1, 3-Dioxypropyl as link arm and screening of tyrosinase inhibition activity in vitro
and 15.16 μM, respectively than the positive drug kojicacid (IC50 with 30.83 μM). The cytotoxicity evaluation showed that compounds 13 and 14 have higher safety than the other compounds to the proliferation of B16F10 cells. The result of the melanocyte test supported that compound13 has stronger cellular tyrosinase inhibitory activity than kojicacid and arbutin at 100 μM and 200 μM. The enzyme kinetics
Synthesis and antioxidant activity of [60]fullerene–flavonoid conjugates
作者:Roger F. Enes、Andreia S.F. Farinha、Augusto C. Tomé、José A.S. Cavaleiro、Riccardo Amorati、Silvia Petrucci、Gian Franco Pedulli
DOI:10.1016/j.tet.2008.10.066
日期:2009.1
chain-breaking antioxidantactivity of the flavonoid derivatives and the corresponding C60 conjugates were evaluated. These results are consistent with the phenolic moiety being the main responsible for the reaction with peroxyl radicals, while the C60 part of the molecule acts synergically by trapping alkyl radicals under reduced O2 partial pressure. These novel C60–flavonoid conjugates are therefore