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Rhodium-catalyzed [4 + 3] cycloaddition between methyl 2-(siloxy)vinyldiazoacetate and pyrroles results in the enantioselective synthesis of highly functionalized 8-azabicyclo[3.2.1]octa-2,6-dienes (tropanes). The reaction proceeds via a rhodium−carbenoid intermediate and involves a tandem cyclopropanation/Cope rearrangement mechanism. The optimum chiral dirhodium catalyst for this transformation is the adamantyl glycine-derived complex, Rh 2 ( S -PTAD) 4 .
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Reddy et al. (2007) studied this question.
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