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The Diels-Alder reaction of (E)-3-methoxycarbonylmethylene-2-oxoindoline with trans- and cis-1,3-pentadienes gave a single product, respectively, in high yield. The structural features of these adducts were elucidated by proton nmr analysis and chemical transformations
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Okada et al. (1992) studied this question.
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