Abstract
4, 6-Dihydrothieno[3, 4-c]furan-5, 5-dioxide (1), a novel precursor of a bis-diene, reacts with quinones to afford the normal Diels-Alder adducts, the quinone-annelated 2, 3-bis (methlene)-7-oxabicyclo[2.2.1]-heptane derivatives. Promising building blocks(3b and 5) for the synthesis of the antineoplastic antibiotics are prepared by this method.
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