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The key element for the synthesis of several alkaloid skeletons consists of a conjugate addition–dipolar cycloaddition of 2,3-bis(phenylsulfonyl)-1,3-butadiene with an appropriate oxime. The resulting cycloadducts are cleaved reductively to provide azapolycyclic scaffolds with strategically placed functionality for further manipulation to the target compounds.
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Flick et al. (2012) studied this question.
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