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Regioselectivity in the reactions of methoxydehydrobenzenes with furans. Part 3. 3-Methoxyfuran and methoxydehydrobenzenes and the chemistry of their adducts
Journal article   Peer reviewed

Regioselectivity in the reactions of methoxydehydrobenzenes with furans. Part 3. 3-Methoxyfuran and methoxydehydrobenzenes and the chemistry of their adducts

R.W. Baker, T.M. Baker, A.A. Birkbeck, R.G.F. Giles, M.V. Sargent, B.W. Skelton and A.H. White
Journal of the Chemical Society, Perkin Transactions 1, (6), pp.1589-1600
1991
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Abstract

The cycloadditions of methoxydehydrobenzenes containing a 3-methoxy group and 3-methoxyfuran are highly regioselective. The adducts, 1,4-dihydro-2-methoxy-1,4-epoxynaphthalenes, undergo mild acid-catalysed hydrolysis providing, first, an isolable 1,2,3,4-tetrahydro-2-methoxy-1,4-epoxy-naphthalen-2-ol, and then a 3,4-dihydro-1,4-epoxynaphthalen-2(1H)-one. The chemistry of these ketones is explored. One of them, 3,4-dihydro-5-methoxy-1,4-epoxynaphthalen-2(1H)-one, readily undergoes catalytic reduction to yield the hexahydro-1,4-epoxynaphthalene-2,5(1H,4aH)dione. The X-ray molecular structure of this dione and of the 2-monobrosyl ester of the derived diol are reported. Treatment of the above adducts with trifluoroacetic acid and acetic anhydride provides a convenient synthesis of 1-acetoxy-2-methoxynaphthalenes.

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