羟基酪醇是一种天然存在的具有抗氧化性能的邻酚类化合物,它是通过三步高产率程序从天然和低成本的化合物(例如酪醇或高香草醇)合成的。首先,通过使用碳酸二甲酯(DMC)作为试剂/溶剂,对这些化合物的醇基进行有效的化学选择性保护。其次,用2-碘氧基苯甲酸(IBX)或Dess-Martin高碘烷试剂(DMP)氧化并用连二亚硫酸钠(Na 2 S 2 O 4)原位还原,可以制备羧甲基化羟基酪醇。最终,通过温和的水解步骤,以高收率和高纯度获得了羟基酪醇,这已通过NMR光谱和HPLC谱图得到了证实。通过类似的方法,亲脂性羟基酪醇衍生物被用作药物,食品,和化妆品制剂,都准备好了。实际上,首先,通过使用酰氯在没有任何催化剂的情况下对酪醇和高香草醇的醇基团进行化学选择性保护,以获得相应的亲脂性衍生物,然后将这些化合物以高收率和高纯度转化为羟基酪醇衍生物。 IBX或DMP和Na2S2O4的氧化/还原途径。
New crosslinkable polyphenols were designed on the basis of model “urushi” and synthesized by oxidative polymerization of urushiol analogues, phenol derivatives bearing an unsaturated group. The polyphenols were readily cured to give crosslinked polymeric films with high gloss surface.
chemoselective protection of the alcoholic group of these compounds was performed by using dimethyl carbonate (DMC) as reagent/solvent; second, the oxidation with 2-iodoxybenzoic acid (IBX) or Dess-Martin periodinane reagent (DMP) and in situ reduction with sodium dithionite (Na2S2O4) allowed the preparation of carboxymethylated hydroxytyrosol; finally, by a mild hydrolytic step, hydroxytyrosol was
羟基酪醇是一种天然存在的具有抗氧化性能的邻酚类化合物,它是通过三步高产率程序从天然和低成本的化合物(例如酪醇或高香草醇)合成的。首先,通过使用碳酸二甲酯(DMC)作为试剂/溶剂,对这些化合物的醇基进行有效的化学选择性保护。其次,用2-碘氧基苯甲酸(IBX)或Dess-Martin高碘烷试剂(DMP)氧化并用连二亚硫酸钠(Na 2 S 2 O 4)原位还原,可以制备羧甲基化羟基酪醇。最终,通过温和的水解步骤,以高收率和高纯度获得了羟基酪醇,这已通过NMR光谱和HPLC谱图得到了证实。通过类似的方法,亲脂性羟基酪醇衍生物被用作药物,食品,和化妆品制剂,都准备好了。实际上,首先,通过使用酰氯在没有任何催化剂的情况下对酪醇和高香草醇的醇基团进行化学选择性保护,以获得相应的亲脂性衍生物,然后将这些化合物以高收率和高纯度转化为羟基酪醇衍生物。 IBX或DMP和Na2S2O4的氧化/还原途径。
Enzymatic Synthesis of Tyrosol-Based Phenolipids: Characterization and Effect of Alkyl Chain Unsaturation on the Antioxidant Activities in Bulk Oil and Oil-in-Water Emulsion
作者:Garima Pande、Casimir C. Akoh
DOI:10.1007/s11746-015-2775-4
日期:2016.3
antioxidants. Free fatty acids and fatty acid ethyl esters (substrate molar ratio tyrosol: acyl donor, 1:10) were used as acyl donors and immobilized lipase from Candida antarctica was the biocatalyst (10 %). The phenolipids were isolated and characterized using ESI–MS, 1H‐NMR, and 13C‐NMR. Peroxide value (PV) and para‐anisidine value (p‐AV) were measured to evaluate their antioxidant activities in bulk