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safrole
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{{chembox| Verifiedfields = changed| Watchedfields = changed| verifiedrevid = 464386125| Name = Safrole| Reference =Merck Index, 11th Edition, 8287| ImageFile = safrole-Line-Structure.png| ImageName = Skeletal formula of safrole| ImageFile1 = Safrole-3D-balls.png| ImageSize1 = 210px| ImageName1 = Ball-and-stick model of safrole| IUPACName = 5-(Prop-2-en-1-yl)-2H-1,3-benzodioxole| OtherNames = 5-(2-Propenyl)-1,3-benzodioxole5-Allylbenzo[d][1,3]dioxole3,4-Methylenedioxyphenyl-2-propene|Section2={{Chembox Properties
H=10 | O=2| Density = 1.096 g/cm3| MeltingPtC = 11| BoilingPtC = 232 to 234| BoilingPt_notes =| MagSus = -97.5·10−6 cm3/mol
}}|Section4={hide}Chembox Hazards
302350{edih}201308+313}}
}}|Section1={hide}Chembox Identifiers
correct|chemspider{edih}| ChemSpiderID = 13848731correct|kegg}}| KEGG = C10490changed|EBI}}| ChEBI = 8994| InChI = 1/C10H10O2/c1-2-3-8-4-5-9-10(6-8)12-7-11-9/h2,4-6H,1,3,7H2| InChIKey = ZMQAAUBTXCXRIC-UHFFFAOYADcorrect|EBI}}| ChEMBL = 242273correct|chemspider}}| StdInChI = 1S/C10H10O2/c1-2-3-8-4-5-9-10(6-8)12-7-11-9/h2,4-6H,1,3,7H2correct|chemspider}}| StdInChIKey = ZMQAAUBTXCXRIC-UHFFFAOYSA-N| CASNo = 94-59-7correct|CAS}}| SMILES = C=CCc1ccc2OCOc2c1}}}}Safrole is an organic compound with the formula CH2O2C6H3CH2CH=CH2. It is a colorless oily liquid, although impure samples can appear yellow. A member of the phenylpropenoid family of natural products, it is found in sassafras plants among others. Small amounts are found in a wide variety of plants, where it functions as a natural antifeedant.JOURNAL, 10.1055/s-2006-959379, Chemical Composition of Essential Oil from the Root Bark of Sassafras albidum, 2007, Kamdem, Donatien, Gage, Douglas, Planta Medica, 61, 6, 574–5, 8824955, Ocotea pretiosa,JOURNAL, 10.1021/jo01161a020, 1948, Hickey, Michael J., Journal of Organic Chemistry, 13, 3, 443–6, 18863852, Investigation of the chemical constituents of Brazilian sassafras oil, which grows in Brazil, and Sassafras albidum,JOURNAL, 10.1055/s-2006-959379, Chemical Composition of Essential Oil from the Root Bark ofSassafras albidum, 2007, Kamdem, Donatien, Gage, Douglas, Planta Medica, 61, 6, 574–5, 8824955, which grows in eastern North America, are the main natural sources of safrole. It has a characteristic "sweet-shop" aroma.It is a precursor in the synthesis of the insecticide synergist piperonyl butoxide, the fragrance piperonal via isosafrole, and the empathogenic/entactogenic drug MDMA.

History

Safrole was obtained from a number of plants, but especially from the sassafras tree (Sassafras albidum), which is native to North America, and from Japanese star anise (Illicium anisatum, called shikimi in Japan).The history of research on safrole appears in: BOOK, Semmler, F.W., Die Ätherischen Öle nach ihren chemischen Bestandteilen unter Berücksichtigung der geschichtlichen Entwicklung, The volatile oils according to their chemical components with regard to their historical development, 1907, Veit & Co., Leipzig, Germany, vol. 4, 139–144,weblink German, In 1844, the French chemist Édouard Saint-Evre determined safrole's empirical formula.JOURNAL, St. Evre, Recherches sur l'huile essentielle de sassafras, Annales de Chimie et de Physique, 1844, 12, 107–113,weblink 3rd series, Investigations of the essential oil of sassafras, French, ; see p. 108. In 1869, the French chemists Édouard Grimaux (1835–1900) and J. Ruotte investigated and named safrole.JOURNAL, Grimaux, E, Ruotte, J., Sur l'essence de sassafras, Comptes Rendus, 1869, 68, 928–930,weblink On the essential oil of sassafras, French, From p. 928: "Ils sont constitués par une principe oxygéné, la safrol C10H10O2 … " (They [i.e., the fractions of essential oil that are safrole] are composed of an oxygenated substance, safrole C10H10O2 … ) They observed its reaction with bromine, suggesting the presence of an allyl group.(Grimaux & Ruotte, 1869), p. 929. By 1884, the German chemist Theodor Poleck (1821–1906) suggested that safrole was a derivative of benzene, to which two oxygen atoms were joined as epoxides (cyclic ethers).JOURNAL, Poleck, Theodor, Ueber die chemische Constitution des Safrols, Berichte der Deutschen Chemischen Gesellschaft, 1884, 17, 2, 1940–1944,weblink On the chemical composition of safrole, 10.1002/cber.18840170278, See structural formula on p. 1941. In 1885, the Dutch chemist Johann Frederik Eijkman (1851–1915) investigated shikimol, the essential oil that is obtained from Japanese star anise, and he found that, upon oxidation, shikimol formed piperonylic acid,JOURNAL, Eijkman, J.F., Sur les principes constituants de l'Illicium religiosum (Sieb.) (Shikimi-no-ki en japonais), Recueil des Travaux Chimiques des Pays-Bas, 1885, 4, 2, 32–54,weblink On the substances composing Illicium religiosum (Sieb.) (Shikimi-no-ki in Japanese), French, 10.1002/recl.18850040202, ; see pp. 39–40. whose basic structure had been determined in 1871 by the German chemist Wilhelm Rudolph Fittig (1835–1910) and his student, the American chemist Ira Remsen (1846–1927).JOURNAL, Fittig, Rud., Remsen, Ira, Untersuchungen über die Constitution des Piperins und seiner Spaltungsproducte Piperinsäure und Piperidin, Annalen der Chemie, 1871, 159, 2, 129–158,weblink Investigations into the composition of piperine and its cleavage products piperic acid and piperidine, German, 10.1002/jlac.18711590202, ; see the structural formula for Piperonylsäure on p. 155. Thus Eijkman inferred the correct basic structure for shikimol.(Eijkman, 1885), pp. 40–41. He also noted that shikimol and safrole had the same empirical formula and had other similar properties, and thus he suggested that they were probably identical.(Eijkman, 1885), pp. 41–42. In 1886, Poleck showed that upon oxidation, safrole also formed piperonylic acid, and thus shikimol and safrole were indeed identical.JOURNAL, Poleck, Th., Ueber die chemische Structur des Safrols, Berichte der Deutschen Chemischen Gesellschaft, 1886, 19, 1094–1098,weblink On the chemical structure of safrole, German, 10.1002/cber.188601901243, It remained to be determined whether the molecule's C3H5 group was a propenyl group (R-CH=CH-CH3) or an allyl group (R-CH2-CH=CH2). In 1888, the German chemist Julius Wilhelm Brühl (1850–1911) determined that the C3H5 group was an allyl group.JOURNAL, Brühl, J.W., Untersuchungen über die Terpene und deren Abkömmlinge, Berichte der Deutschen Chemischen Gesellschaft, 21, 457–477,weblink Investigations of the terpenes and their derivatives, German, 10.1002/cber.18880210181, 1888, ; see pp. 474–477.

Natural occurrence

Safrole is the principal component of brown camphor oil. Ocotea cymbarum oil made from Ocotea pretiosa, a plant growing in Brazil, and sassafras oil made from Sassafras albidum.In the US, commercially available culinary sassafras oil is usually devoid of safrole due to a rule passed by the U.S. FDA in 1960.Safrole can be obtained through natural extraction from Sassafras albidum and Ocotea cymbarum. Sassafras oil for example is obtained by steam distillation of the root bark of the sassafras tree. The resulting steam distilled product contains about 90% safrole by weight. The oil is dried by mixing it with a small amount of anhydrous calcium chloride. After filtering-off the calcium chloride, the oil is vacuum distilled at 100 Â°C under a vacuum of 11 mmHg or frozen to crystallize the safrole out. This technique works with other oils in which safrole is present as well.BOOK, Kings Chem Guide Second Edition, Ledgard, J., 2010, JOURNAL, Perkin, William Henry, Trikojus, Victor Martin, yes, CCXII.—A synthesis of safrole and o-safrole, Journal of the Chemical Society, 0, 1927, 1663–1666, 10.1039/JR9270001663, Safrole is typically extracted from the root-bark or the fruit of Sassafras albidumJOURNAL, Kamdem, Donatien, Gage, Douglas, 1995-12-01, Chemical Composition of Essential Oil from the Root Bark ofSassafras albidum, Planta Medica, en, 61, 6, 574–575, 10.1055/s-2006-959379, 8824955, 0032-0943, (native to eastern North America) in the form of sassafras oil, or from Ocotea odorifera,JOURNAL, Hickey, M. J., 1948-05-01, Investigation of the chemical constituents of Brazilian sassafras oil, The Journal of Organic Chemistry, 13, 3, 443–446, 0022-3263, 18863852, 10.1021/jo01161a020, a Brazilian species. Safrole is also present in certain essentials oils and in brown camphor oil, which is present, in small amounts, in many plants. Safrole can be found in anise, nutmeg, cinnamon, and black pepper. Safrole can be detected in undiluted liquid beverages and pharmaceutical preparations by high-performance liquid chromatography.JOURNAL, Wisneski, Harris H., Yates, Ronald L., Davis, Henry M., High-performance liquid chromatographic—fluorometric determination of safrole in perfume, cologne and toilet water, Journal of Chromatography A, en, 255, 455–461, 10.1016/s0021-9673(01)88300-x, 1983,

Applications

Safrole is a member of the methylenedioxybenzene group, of which many compounds are used as insecticide synergists; for example, safrole is used as a precursor in the synthesis of the insecticide piperonyl butoxide. Safrole is also used as a precursor in the synthesis of the drug N-methyl-3,4-methylenedioxyamphetamine (MDMA, Ecstasy). Before safrole was banned by the FDA in 1960 for use in food, it was used as a food flavour for its characteristic ‘candy-shop’ aroma. It was used as an additive in root beer, chewing gum, toothpaste, soaps, and certain pharmaceutical preparations.Safrole exhibits antibioticJOURNAL, Hung, Shan-Ling, Chen, Yu-Ling, Chen, Yen-Ting, 2003-04-01, Effects of safrole on the defensive functions of human neutrophils, Journal of Periodontal Research, 38, 2, 130–134, 0022-3484, 12608906, 10.1034/j.1600-0765.2003.01652.x, and anti-angiogenicJOURNAL, Zhao, Jing, Miao, Junying, Zhao, Baoxiang, Zhang, Shangli, Yin, Deling, 2005-06-01, Safrole oxide inhibits angiogenesis by inducing apoptosis, Vascular Pharmacology, 43, 1, 69–74, 10.1016/j.vph.2005.04.004, 1537-1891, 15936989, functions.

Synthesis

It can be synthesized from catecholJOURNAL, Perkin, William Henry, Trikojus, Victor Martin, 1927-01-01, CCXII.—A synthesis of safrole and o-safrole, J. Chem. Soc., en, 0, 1663–1666, 10.1039/jr9270001663, 0368-1769, first by conversion to methylenedioxybenzene, which is brominated and coupled with allyl bromide.WEB,weblink Synthesis of Safrole - [www.rhodium.ws], erowid.org, 2017-04-27, Safrole is a versatile precursor to many compounds. Examples are N-acylarylhydrazones, isosters,JOURNAL, Lima, P. C., Lima, L. M., da Silva, K. C., Léda, P. H., de Miranda, A. L., Fraga, C. A., Barreiro, E. J., 2000-02-01, Synthesis and analgesic activity of novel N-acylarylhydrazones and isosters, derived from natural safrole, European Journal of Medicinal Chemistry, 35, 2, 187–203, 0223-5234, 10758281, 10.1016/s0223-5234(00)00120-3, aryl-sulfonamide derivatives,JOURNAL, Lages, A. S., Silva, K. C., Miranda, A. L., Fraga, C. A., Barreiro, E. J., 1998-01-20, Synthesis and pharmacological evaluation of new flosulide analogues, synthesized from natural safrole, Bioorganic & Medicinal Chemistry Letters, 8, 2, 183–188, 0960-894X, 9871651, 10.1016/s0960-894x(97)10216-5, acidic sulphonylhydrazone derivatives,JOURNAL, Lima, L.M., Amarante, E.G., Miranda, A.L.P., Fraga, C.A.M., Barreiro, E.J., Synthesis and Antinociceptive Profile of Novel Acidic Sulphonylhydrazone Derivatives From Natural Safrole, Pharmacy and Pharmacology Communications, 5, 12, 673–678, 10.1211/146080899128734370, 1999, benzothiazine derivatives.JOURNAL, Fraga, Carlos A. M., Barreiro, Eliezer J., 1992-10-01, The synthesis of a new benzothiazine derivative, related to oxicams, synthesized from natural safrole, Journal of Heterocyclic Chemistry, en, 29, 6, 1667–1669, 10.1002/jhet.5570290652, 1943-5193, and many more.

Isosafrole

Isosafrole is produced synthetically from safrole. It is not found in nature. Isosafrole comes in two forms, trans-isosafrole and cis-isosafrole. Isosafrole is used as a precursor for the psychoactive drug MDMA. When safrole is metabolized several metabolites can be identified. Some of these metabolites have been shown to exhibit toxicological effects, such as 1’-hydroxysafrole and 3’-hydroxysafrole in rats. Further metabolites of safrole that have been found in urine of both rats and human include 1,2-dihydroxy-4-allylbenzene or 1(2)-methoxy-2(1)hydroxy-4- allylbenzene.JOURNAL, Ioannides, C., Delaforge, M., Parke, D. V., 1981-10-01, Safrole: its metabolism, carcinogenicity and interactions with cytochrome P-450, Food and Cosmetics Toxicology, 19, 5, 657–666, 0015-6264, 7030889, 10.1016/0015-6264(81)90518-6,

Metabolism

Safrole can undergo many forms of metabolism. The two major routes are the oxidation of the allyl side chain and the oxidation of the methylenedioxy group.JOURNAL, Sekizawa, J., Shibamoto, T., 1982-04-01, Genotoxicity of safrole-related chemicals in microbial test systems, Mutation Research, 101, 2, 127–140, 0027-5107, 6808388, 10.1016/0165-1218(82)90003-9, The oxidation of the allyl side chain is mediated by a cytochrome P450 complex, which will transform safrole into 1’-hydroxysafrole. The newly formed 1’-hydroxysafrole will undergo a phase II of Drug metabolism reaction with a Sulfotransferase enzyme to create 1’-sulfoxysafrole, which can cause DNA adducts.JOURNAL, Jeurissen, Suzanne M. F., Bogaards, Jan J. P., Awad, Hanem M., Boersma, Marelle G., Brand, Walter, Fiamegos, Yiannis C., van Beek, Teris A., Alink, Gerrit M., Sudhölter, Ernst J. R., 2004-09-01, Human cytochrome p450 enzyme specificity for bioactivation of safrole to the proximate carcinogen 1'-hydroxysafrole, Chemical Research in Toxicology, 17, 9, 1245–1250, 10.1021/tx040001v, 0893-228X, 15377158, A different oxidation pathway of the allyl side chain can form safrole epoxide. So far, this has only been found in rats and guinea pigs. The formed epoxide is a small metabolite due to the slow formation and further metabolism of the compound. An epoxide hydratase enzyme will act on the epoxide to form dihydrodiol, which can be secreted in urine.The metabolism of safrole through the oxidation of the methylenedioxy proceeds via the cleavage of the methylenedioxy group. This results in two major metabolites: allylcatechol and its isomer, propenylcatechol. Eugenol is a minor metabolite of safrole in humans, mice, and rats. The intact allyl side chain of allylcatechol may be oxidized to yield 2’,3’-epoxypropylcatechol. This can serve as a substrate for an epoxide hydratase enzyme, and will hydrate the 2’,3’-epoxypropylcatechol to 2’,3’-dihydroxypropylcatechol. This new compound can be oxidized to form propanoic acid (PPA), which is a substance that is related to an increase in oxidative stress and Glutathione S-transferase activity. PPA also causes a decrease in glutathione and Glutathione peroxidase activity.JOURNAL, MacFabe, Derrick F., Cain, Donald P., Rodriguez-Capote, Karina, Franklin, Andrew E., Hoffman, Jennifer E., Boon, Francis, Taylor, A. Roy, Kavaliers, Martin, Ossenkopp, Klaus-Peter, 2007-01-10, Neurobiological effects of intraventricular propionic acid in rats: Possible role of short chain fatty acids on the pathogenesis and characteristics of autism spectrum disorders, Behavioural Brain Research, Animal Models for Autism, 176, 1, 149–169, 10.1016/j.bbr.2006.07.025, 16950524, The epoxide of allylcatechol may also be generated from the cleavage of the methylenedioxy group of the safrole epoxide. The cleavage of the methylenedioxy ring and the metabolism of the allyl group involve the hepatic microsomal mixed-function oxidases.

Toxicity

Toxicological studies have shown that safrole is a weak hepatocarcinogen at higher doses in rats and mice. Safrole requires metabolic activation before exhibiting toxicological effects. Metabolic conversion of the allyl group in safrole is able to produce intermediates which are directly capable of binding covalently with DNA and proteins. Metabolism of the methylenedioxy group to a carbene allows the molecule to form ligand complexes with cytochrome P450 and P448. The formation of this complex leads to lower amounts of available free cytochrome P450. Safrole can also directly bind to cytochrome P450, leading to competitive inhibition. These two mechanisms result in lowered mixed function oxidase activity.Furthermore, because of the altered structural and functional properties of cytochrome P450, loss of ribosomes which are attached to the endoplasmatic reticulum through cytochrome P450 may occur. The allyl group thus directly contributes to mutagenicity, while the methylenedioxy group is associated with changes in the cytochrome P450 system and epigenetic aspects of carcinogenicity. In rats, safrole and related compounds produced both benign and malignant tumors after intake through the mouth. Changes in the liver are also observed through the enlargement of liver cells and cell death.Studies in the 1960s suggested that safrole was carcinogenic, causing permanent liver damage in animals. Consequently, the US Food and Drug Administration (FDA) banned sassafras and safrole for human consumption.O'MATHUNA, DONAL. Does it work? Can sassafras be used as a general tonic?, Irish Times, 10 August 2010Safrole is still regarded by FDA to be a weak carcinogen in rats.JOURNAL, Hagan, Ernest C., Jenner, Paul M., Jones, Wm.I., Fitzhugh, O.Garth, Long, Eleanor L., Brouwer, J.G., Webb, Willis K., Toxic properties of compounds related to safrole, Toxicology and Applied Pharmacology, en, 7, 1, 18–24, 10.1016/0041-008x(65)90069-4, 1965, JOURNAL, 10.1016/S0278-6915(99)00055-1, Safrole-induced Oxidative Damage in the Liver of Sprague–Dawley Rats, 1999, Liu, T.Y, Chen, C.C, Chen, C.L, Chi, C.W, Food and Chemical Toxicology, 37, 7, 697–702, 10496370, However, according to a 1977 study of the metabolites of safrole in both rats and humans, two carcinogenic metabolites of safrole found in the urine of rats, 1'-hydroxysafrole and 3'-hydroxyisosafrole, were not found in human urine.JOURNAL, 10.1016/0300-483X(77)90039-7, Absorption, metabolism and excretion of safrole in the rat and man, 1977, Benedetti, M, Malnoe, A, Broillet, A, Toxicology, 7, 69–83, 14422, 1, The European Commission on Health and consumer protection assumes safrole to be genotoxic and carcinogenic.Opinion of the Scientific Committee on Food on the safety of the presence of safrole (1-allyl-3,4- methylene dioxy benzene) in flavourings and other food ingredients with flavouring properties It occurs naturally in a variety of spices, such as cinnamon, nutmeg, and black pepper, and herbs such as basil. In that role, safrole, like many naturally occurring compounds, may have a small but measurable ability to induce cancer in rodents. Despite this, the effects in humans were estimated by the Lawrence Berkeley National Laboratory to be similar to risks posed by breathing indoor air or drinking municipally supplied water.WEB, Ranking Possible Cancer Hazards on the HERP Index,weblink 2013-10-22, In the United States, it was once widely used as a food additive in root beer, sassafras tea, and other common goods, but was banned by the FDA after its carcinogenicity in rats was discovered. Today, safrole is also banned for use in soap and perfumes by the International Fragrance Association.

Adverse effects

Besides being a hepatocarcinogen, safrole exhibits further adverse effects in that it will induce the formation of hepatic lipid hydroperoxides.JOURNAL, Liu, T. Y, Chen, C. C, Chen, C. L, Chi, C. W, 1999-07-01, Safrole-induced Oxidative Damage in the Liver of Sprague–Dawley Rats, Food and Chemical Toxicology, 37, 7, 697–702, 10.1016/S0278-6915(99)00055-1, Safrole also inhibits the defensive function of neutrophils against bacteria. In addition to the inhibition of the defensive function of neutrophils, it has also been discovered that safrole interferes with the formation of superoxides by neutrophils. Furthermore, safrole oxide, a metabolite of safrole, has a negative effect on the central nervous system. Safrole oxide inhibits the expression of integrin β4/SOD, which leads to apoptosis of the nerve cells.JOURNAL, Su, Le, Zhao, BaoXiang, Lv, Xin, Wang, Nan, Zhao, Jing, Zhang, ShangLi, Miao, JunYing, 2007-02-20, Safrole oxide induces neuronal apoptosis through inhibition of integrin β4/SOD activity and elevation of ROS/NADPH oxidase activity, Life Sciences, 80, 11, 999–1006, 10.1016/j.lfs.2006.11.041, 17188719,

Use in MDMA manufacture

Safrole is listed as a Table I precursor under the United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances.International Narcotics Control Board {{webarchive|url=https://web.archive.org/web/20080227224025weblink |date=2008-02-27 }}Due to its role in the manufacture of MDMA, safrole and isosafrole, as well as piperonal, are Category I precursors under regulation No 273/2004 of the European Community.EU LAW, Regulation (EC), 273, 2004, 18 February 2004, Regulation (EC) No 273/2004 of the European Parliament and of the Council of 11 February 2004 on drug precursors, OJ:L:2004:047:0001:0010:EN:PDF, In the United States, safrole is currently a List I chemical.The root bark of American sassafras contains a low percentage of steam-volatile oil, which is typically 75% safrole.The Merck Index, 13th edition, Merck & Co, Inc, Whitehorse Station, NJ, copyright 2001. Attempts to refine safrole from sassafras bark in mass quantities are generally not economically viable due to low yield and high effort. However, smaller quantities can be extracted quite easily via steam distillation (about 10% of dry sassafras root bark by mass, or about 2% of fresh bark).BOOK, Ledgard, Jared, Kings Chem Guide, 2010, UVKCHEM, Inc., 9780578058658, 206, 2nd,weblink 6 September 2014, Demand for safrole is causing rapid and illicit harvesting of the Cinnamomum parthenoxylon tree in Southeast Asia, in particular the Cardamom Mountains in Cambodia.WEB
, Campbell
, Sam
, Harvested to make Ecstasy, Cambodia's trees are felled one by one.
, GlobalPost
, 30 August 2009
,weblink
, 2 September 2009
, However, it is not clear what proportion of illicitly harvested safrole is going toward MDMA production, as over 90% of the global safrole supply (about 2000 metric tons per year) is used to manufacture pesticides, fragrances, and other chemicals.WEB,weblink Harvesting Trees to Make Ecstasy Drug, Tom, Blickman, February 3, 2009, The Irrawaddy, BOOK,weblink Piper hispidinervum: A Sustainable Source of Safrole, Rocha, Sérgio F.R., Lin Chau, Ming, 1999, Jules, Janick, Perspectives on new crops and new uses, ASHS Press, Alexandria, Virginia, 479–81, 978-0-9615027-0-6, Sustainable harvesting of safrole is possible from leaves and stems of certain plants.

See also

References

{{reflist|30em}}

External links

{{Phenylpropene}}{{Authority control}}


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