Ustalic acid

Ustalic acid is a naturally occurring chemical compound found in the poisonous mushroom Tricholoma ustale.

Ustalic acid
Names
Systematic IUPAC name
(2,2’-(1,3-Dioxolane-4,5-diylidene)bis(phenylacetic acid)
Identifiers
3D model (JSmol)
ChemSpider
Properties
C19H14O6
Molar mass 338.315 g·mol−1
Appearance White solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Occurrence

The compound was first reported by Japanese researcher Hirokazu Kawagishi and colleagues in 2002, who isolated about 190 milligrams of the chemical from 30.3 kg (67 lb) of fresh mushrooms and determined its complete structure.[1]

Toxicity

Ustalic acid is an inhibitor of the sodium-potassium pump (Na+/K+-ATPase), found in the plasma membrane of all animal cells. Physiologically, inhibition of the sodium-potassium pump generally causes diarrhea, as it prevents water reabsorption from the intestines. When force-fed to mice, ustalic acid causes them to sit still in a crouched position, hesitant to move, and induces tremors and abdominal contractions. High enough concentrations of the toxin (10 milligrams per mouse) cause death.[1] Biosynthetically, ustalic acid is thought to originate from oxidative cleavage of the red pigment phlebiarubron.[2]

Synthesis

A low-yield total synthesis of the dimethyl ester of ustalic acid was reported in 2006, starting with phlebiarubrone. The oxidation was achieved with lead tetraacetate.[2] Hayakawa and colleagues reported a more efficient synthesis in 2008, using sesamol as a starting point. This procedure requires eight steps, and uses Suzuki–Miyaura coupling and oxidation of methylene acetal.[3]

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See also

References
  1. Sano, Y; Sayama, K; Arimoto, Y; Inakuma, T; Kobayashi, K; Koshino, H; Kawagishi, H (2002). "Ustalic acid as a toxin and related compounds from the mushroom Tricholoma ustale". Chemical Communications (13): 1384–5. doi:10.1039/B202607D. PMID 12125567.
  2. Sawayama,Y; Tsujimoto, T; Sugino, K; Nishikawa, T; Isobe, M; Kawagishi, H (2006). "Syntheses of naturally occurring terphenyls and related compounds". Bioscience, Biotechnology, and Biochemistry. 70 (12): 2998–3003. doi:10.1271/bbb.60389. PMID 17151478.
  3. Hayakawa, Ichiro; Watanabe, Hidekazu; Kigoshi, Hideo (2008). "Synthesis of ustalic acid, an inhibitor of Na+,K+-ATPase" (PDF). Tetrahedron. 64 (25): 5873–7. doi:10.1016/j.tet.2008.04.051.
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