906653-32-5Relevant academic research and scientific papers
Total Synthesis of the Antiviral Natural Product Houttuynoid B
Kerl, Thomas,Berger, Florian,Schmalz, Hans-Günther
, p. 2935 - 2938 (2016)
The first total synthesis of houttuynoid B, a powerful antiviral flavonoid glycoside from the Chinese plant Houttuynia cordata, is described. In a key step, a Baker-Venkataraman rearrangement employing an already glycosylated substrate was used to efficiently set up the fully functionalized carbon skeleton. The required benzofuran building block was prepared through a domino Sonogashira coupling/5-endo-dig cyclization and converted into a stable 1-hydroxybenzotriazole-derived active ester prior to linking with a galactosylated hydroxyacetophenone unit. The elaborated synthesis requires only nine steps (11 % overall yield) along the longest linear sequence and paves the way for the preparation of structurally related compounds for further biological evaluation.
Isotopic labelling of quercetin 3-glucoside
Caldwell, Stuart T.,Petersson, Hanna M.,Farrugia, Louis J.,Mullen, William,Crozier, Alan,Hartley, Richard C.
, p. 7257 - 7265 (2007/10/03)
The potentially important dietary antioxidant, quercetin 3-O-β-d-glucoside, has been 13C-labelled at C-2 of the flavonoid unit by synthesis in 15% yield over five steps from [13C]carbon dioxide. The route is appropriate for radiochemical synthesis. Formation of the protected 3-glucosylated flavonol appears to result from [1,7]-sigmatropic rearrangement with migration of a benzyl group followed by cyclisation. A free 5-OH results even when a phosphazene superbase is used.
