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We describe the use of diethylzinc in conjunction with polybromo ketones for the production of oxyallyls, and the interception of these intermediates by furans and methyl pyrrole-N-carboxylate. This methodology allows the production of gramme quantities of tropane alkaloids, and 2-substituted 8-oxabicyclo[3.2.1 ]oct-6-en-3-ones that have been either difficult or impossible to prepare.
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Mann et al. (1992) studied this question.
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