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Intramolecular Diels-Alder reaction of the oxazole-olefins (8a) and (11a) was effectively promoted by addition of a catalytic amount of copper(II) triflate to afford the cyclopenta[c]pyridines (9a) and (12a), respectively.Oxazoles have been known to participate as azadiene components in Diels-Alder reactions with olefinic dienophiles to give pyridine derivatives. 1 Since an intramolecular version of this cycloaddition was
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Ohba et al. (2001) studied this question.
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