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Advances in selectivity: The use of chiral phosphoramidite ligands in asymmetric Pd-catalyzed [3+2] cycloadditions of trimethylenemethane derivatives affords exo-methylenecyclopentanes. This type of reaction has been used to prepare diverse compounds such as pyrrolidines and spirocyclic oxindolic cyclopentanes in good yields and with excellent selectivity (see scheme).
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Marquand et al. (2008) studied this question.
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