Menthofuran

Menthofuran
Names
	IUPAC name 3,6-Dimethyl-4,5,6,7-tetrahydro-1-benzofuran
Identifiers
CAS Number	494-90-6 ; 17957-94-7 (R) ; 80183-38-6 (S) ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:50542;
ChemSpider	292309;
ECHA InfoCard	100.007.087
PubChem CID	329983;
UNII	LK024V9U3C ; 9N0IS8189W (R) ; OS9602CGD2 (S) ;
CompTox Dashboard (EPA)	DTXSID9025534 ;
	InChI InChI=1S/C10H14O/c1-7-3-4-9-8(2)6-11-10(9)5-7/h6-7H,3-5H2,1-2H3 Key: YGWKXXYGDYYFJU-UHFFFAOYSA-N; InChI=1/C10H14O/c1-7-3-4-9-8(2)6-11-10(9)5-7/h6-7H,3-5H2,1-2H3 Key: YGWKXXYGDYYFJU-UHFFFAOYAW;
	SMILES o1c2c(c(c1)C)CCC(C2)C;
Properties
Chemical formula	C10H14O
Molar mass	150.221 g·mol−1
Boiling point	208
Hazards
Flash point	86
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	Infobox references

Menthofuran is an organic compound found in a variety of essential oils including that of pennyroyal (Mentha pulegium). It is highly toxic and believed to be the primary toxin in pennyroyal responsible for its potentially fatal effects.[1] After ingestion of menthofuran, it is metabolically activated to chemically reactive intermediates that are hepatotoxic.[2]

Biosynthesis

Menthofuran is produced biosynthetically from pulegone by the enzyme menthofuran synthase.

Menthofuran synthase converts pulegone to menthofuran

Synthesis

Menthofuran can be synthesized from 5-methylcyclohexane-1,3-dione and allenyldimethylsulfonium bromide in two steps via a furannulation strategy consisting of enolate addition and rearrangement.[3]

References

Anderson IB, Mullen WH, Meeker JE, Khojasteh-BakhtSC, Oishi S, Nelson SD, Blanc PD (April 1996). "Pennyroyal toxicity: measurement of toxic metabolite levels in two cases and review of the literature". Annals of Internal Medicine. 124 (8): 726–34. doi:10.7326/0003-4819-124-8-199604150-00004. PMID 8633832.
Thomassen D, Knebel N, Slattery JT, McClanahan RH, Nelson SD (1992). "Reactive intermediates in the oxidation of menthofuran by cytochromes P-450". Chemical Research in Toxicology. 5 (1): 123–30. doi:10.1021/tx00025a021. PMID 1581528.
Mariko Aso; Sakamoto, Mizue; Urakawa, Narumi; Kanematsu, Ken (1990). "Furannulation strategy. An efficient synthesis of fused 3-methylfurans". Heterocycles. 31 (6): 1003–6. doi:10.3987/com-90-5392.

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[pmid8633832-1] Anderson IB, Mullen WH, Meeker JE, Khojasteh-BakhtSC, Oishi S, Nelson SD, Blanc PD (April 1996). "Pennyroyal toxicity: measurement of toxic metabolite levels in two cases and review of the literature". Annals of Internal Medicine. 124 (8): 726–34. doi:10.7326/0003-4819-124-8-199604150-00004. PMID 8633832.

[pmid1581528-2] Thomassen D, Knebel N, Slattery JT, McClanahan RH, Nelson SD (1992). "Reactive intermediates in the oxidation of menthofuran by cytochromes P-450". Chemical Research in Toxicology. 5 (1): 123–30. doi:10.1021/tx00025a021. PMID 1581528.

[3] Mariko Aso; Sakamoto, Mizue; Urakawa, Narumi; Kanematsu, Ken (1990). "Furannulation strategy. An efficient synthesis of fused 3-methylfurans". Heterocycles. 31 (6): 1003–6. doi:10.3987/com-90-5392.