Abstract
The reactions of dimethyldioxirane (7) and methyl(trifluoromethyl)dioxirane (8) with 2,7-dimethyloxepin (4) both yielded Z,Z-3,5-octadiene-2,7-dione (Z,Z-6) as their initial stable products. This is the first published reaction of a dioxirane with an isolable pure oxepin. Reaction of the dienedione Z,Z-6 with one mole equivalent of either 7 or 8 yielded the corresponding monoepoxide. Treatment of this monoepoxide with another equivalent of 8 yielded the corresponding diepoxides (probably meso and R,S). The suggestion of Murray and co-workers that dioxiranes may model some of the reactivities of monooxygenases and their rapid epoxidations of alkenes under neutral conditions at low temperatures suggested their use. Our initial attempts to directly observe the putative intermediate 1,3-dimethyl-2,8-dioxabicyclo-[5.1.0]octa-3,5-diene (“2,7-dimethyl-2,3-oxepin” (2)] at low temperatures (ca. −60°C) yielded promising but inconclusive results when dimethyldioxirane (7) was employed. The epoxidation reaction was sufficiently slow that it only occurred measurably above −30°C, a temperature at which thermal ring opening to the dienedione is competitive. Initial reactions with the much more reactive methyl)trifluoromethyl)dioxirane (8) led to immediate ring opening at temperatures as low as −80°C. Since 8 is known to isomerize to methyl trifluoroacetate and since water is present, a trace of trifluoroacetic acid was suspected of catalyzing the ring opening of 2. Thus, inclusion of either suspended Na2HPO4 or miscible 2,6-di-t-butylpyridine at −80°C yielded an intermediate stable up to ca. 0°C, which is likely to be the 2,3-epoxyoxepin 2.
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REFERENCES
Williams, R. T. Detoxification Mechanisms, 2nd ed.; Wiley-Interscience: New York, 1959, p. 189.
Tomida, I.; Nakajima, M. The chemistry of 3,5-cyclohexadiene-1,2-diol VI. Metabolism of the glycols and muconic dialdehyde. Z. Physiol. Chem. 1960, 318, 171–178.
Goldstein, B. D.; Witz, G.; Javid, J.; Amorusa, M.; Rossman, T.; Wolder, B. Muconaldehyde, a potential toxic intermediate of benzene metabolism, in Biological Reactive Intermediates, vol. 2, part A; R. Snyder, V. V. Parke, J. J. Kocsis, D. Jallow, G. G. Gibson, and C. M. Witmer, eds.; Plenum: New York, 1982, pp. 331–339.
Latriano, L.; Goldstein, B. D.; Witz, G. Formation of muconaldehyde, an open-ring metabolite of benzene, in mouse liver microsomes: An additional pathway for toxic metabolites. Proc. Natl. Acad. Sci. USA 1986, 83, 8356–8360.
Goldstein, B. D.; Witz, G. Benzene, in Critical Reviews of Environmental Toxicants—Human Exposures and Their Health Effects, M. Lippmann, ed.; Van Nostrand: New York, 1991, chap. 3.
Davies, S. G.; Whitham, G. H. Benzene oxide-oxepin oxidation to muconaldehyde. J. Chem. Soc., Perkin Trans. 1977, 1, 1346–1347.
Greenberg, A.; Bock, C. W.; George, P.; Glusker, J. P. Energetics of the metabolic production of E,E-muconaldehyde from benzene via the intermediates 2,3-epoxyoxepin and (Z,Z)-and (E,Z)-muconaldehyde: Ab initio molecular orbital calculations. Chem. Res. Toxicol. 1993, 6, 701–710.
George, P.; Bock, C. W.; Glusker, J. P.; Greenberg, A.; Gallagher, J. D. Thermal rearrangements of bicyclo[5.1.0]octa-2,4-diene and its 8-oxa, 6-oxa, and 6,8-dioxa derivatives: An ab initio molecular orbital study. J. Org. Chem. 1995, 60, 4385–4394.
Klotz, B.; Becker, K. H.; Golding, B. T. Atmospheric chemistry of benzene oxide/oxepin. J. Chem. Soc., Faraday Trans. 1997, 93, 1507–1516.
Jeyaraman, R.; Murray, R. W. Production of arene oxides by the caroate-acetone system (dimethyldioxirane). J. Am. Chem. Soc. 1984, 106, 2462–2463.
Murray, R. W.; Jeyaraman, R. Dioxiranes: Synthesis and reactions of methyldioxiranes. J. Org. Chem. 1985, 50, 2847–2853.
Murray, R. W. Dioxiranes. Chem. Rev. 1989, 89, 1187–1201.
Adam, W.; Curci, R.; Edwards, J. O. Dioxiranes: A new class of powerful oxidants. Acc. Chem. Res. 1989, 22, 205–211.
Mello, R.; Ciminale, F.; Fiorentino, M.; Fusco, C.; Prencipe, T.; Curci, R. Oxidation by methyl(trifluoromethyl)dioxirane. 4. Oxyfunctionalization of aromatic hydrocarbons. Tetrahedron Lett. 1990, 31, 6097–6100.
Vogel, E.; Gunther, H. Benzene oxide-oxepin valence tautomerism. Angew. Chem. Int. Ed. Engl. 1967, 6, 385–401.
Murray, R. W.; Singh, M. Activation of PAH by ozone derived oxidants: Results using fly ash as particulate. Polycycl. Arom. Cmpds. 1997, 12, 51–60.
Jerina, D. M.; Daly, J. W.; Witkop, B.; Zaltsman-Nirenberg, P.; Udenfriend, S. The role of arene oxide-oxepin systems in the metabolism of aromatic substrates. III. Formation of 1,2-na-phthalene oxide from naphthalene by liver microsomes. J. Am. Chem. Soc. 1968, 90, 6525–6527.
Jerina, D. M.; Daly, J. W. Arene oxides: A new aspect of drug metabolism. Science 1974, 185, 573–582.
Jerina, D. M.; Yagi, H.; Daly, J. W. Arene oxides-oxepins. Heterocycles 1976, 1, 267–326.
Rastetter, W. H. sym-Oxepin oxide. J. Am. Chem. Soc. 1976, 98, 6350–6353.
The E r values for 4,5-epoxyoxepin (9) are: 6–31G*//6–31G*: −380.32237 au; MP2/6–31G*//6–31G*: −381.42705 au; Greenberg, A.; Bock, C. W.; George, P.; Glusker, J. P. Unpublished results.
Stark, A.-A.; Rastetter, W. H. Structure-activity relationships in the mutagenicity and cytotoxicity of putative metabolites and related analogs of benzene derived from the valence tautomers benzene oxide and oxepin. Environ. Molec. Mutagen 1996, 28, 284–293.
Latriano, L.; Zaccaria, A.; Goldstein, B. D.; Witz, G. Muconaldehyde formation from free 14C-benzene in a hydroxyl-radical generating system. J. Free Radical Biol. Med. 1986, 1, 363–371.
Kirley, T. A.; Goldstein, B. D.; Maniara, W. M.; Witz, G. Metabolism of trans,trans-muconaldehyde, a microsomal hematotoxic metabolite of benzene, by purified yeast dehydrogenase and a mouse liver soluble fraction. Toxicol. Appl. Pharmacol. 1989, 100, 360–367.
Goon, D.; Cheng, X.; Ruth, J. A.; Petersen, D. R.; Ross, D. Metabolism of trans,trans-muconaldehyde by aldehyde and alcohol dehydrogenase: Identification of a novel metabolite. Toxicol. Appl. Pharmacol. 1992, 114, 147–155.
Baumgarten, H. F. (editor-in-chief). Organic Syntheses, collective vol. 5; J. Wiley and Sons: New York, 1973, pp. 467–471.
Mello, R.; Fiorentino, M.; Sciacovelli, O.; Curci, R. On the isolation and characterization of methyl(trifluoromethyl)dioxirane. J. Org. Chem. 1988, 53, 3890–3891.
Mello, R.; Fiorentino, M.; Fusco, C.; Curci, R. Oxidations by methyl(trifluoromethyl)dioxirane. 2. Oxyfunctionalization of saturated hydrocarbons. J. Am. Chem. Soc. 1989, 111, 6749–6757.
Hopf, H.; Hamann, V.; Zimmerman, G.; Remmler, M. The propargyl-Cope rearrangement of meso-and d,l-3,4-dimethyl-1,5-hexadiyne-3,4-diol. Chem. Ber. 1994, 127, 959–963.
Golding, B. T.; Kennedy, G.; Watson, W. P. Simple syntheses of isomers of muconaldehyde and 2-methylmuconaldehyde. Tetrahedron Lett. 1988, 29, 5991–5994.
Baumstark, A. L.; McCloskey, C. J. Epoxidation of alkenes by dimethyldioxirane: Evidence for a spiro transition state. Tetrahedron Lett. 1987, 28, 3311–3314.
Baumstark, A. L.; Vasquez, P. C. Epoxidation by dimethyldioxirane: Electronic and steric effects. J. Org. Chem. 1988, 53, 3437–3439.
Jackman, L. M.; Sternhell, S. Applications of Nuclear Magnetic Resonance Spectroscopy in Organic Chemistry, 2nd ed.; Pergamon Press: Oxford, 1969, pp. 272, 302.
Aczel, T.; Lumpkin, H. E. Correlation of mass spectra with structure in aromatic oxygenated compounds: Aromatic alcohols and phenols. Anal. Chem. 1960, 32, 1819–1822.
Welti, D. Infrared Vapour Spectra. Heyden & Son Ltd.: London, 1970, Chapter 5, Index Nos. 56–61.
Greenberg, A. Exploration of selected pathways for metabolic oxidative ring opening of benzene based on estimates of molecular energetics, in Active Oxygen in Biochemistry, J. S. Valentine, C. S. Foote, A. Greenberg, and J. F. Liebman, eds.; Blackie Academic & Professional: London, 1995, pp. 419–422.
Murray, R. W.; Singh, M.; Rath, N. P. Reaction of hexame-thylbenzene with dimethyldioxirane. J. Org. Chem. 1996, 61, 7660–7661.
Greenberg, A.; Bock, C. W.; George, P.; Glusker, J. P. Mechanism of metabolic ring opening of benzene and its relation to mammalian PAH metabolism. Polycyclic Arom. Cmpds. 1994, 7, 123–128.
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Greenberg, A., Ozari, A. & Carlin, C.M. Reactions of 2,7-Dimethyloxepin with Dimethyldioxirane and Methyl(trifluoromethyl)dioxirane: Ring Opening and Probable Observation of the Intermediate “2,3-Epoxyoxepin”. Structural Chemistry 9, 223–236 (1998). https://doi.org/10.1023/A:1022427232134
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DOI: https://doi.org/10.1023/A:1022427232134