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Instead of a thermodynamic preference for
the intermediate leading to the exo diastereomer (with equilibration
to starting material), de Ler(ÈËÃû) a proposes a higher energy transition
state in the rate-limiting step for formation of the endo diastereomer.
The endo isomer arises from activation of the indole 2,3-¦Ð bond
by the electrophile to form diastereomeric benzylic carbocations
(exo diastereomer, 74, Figure 8B), then formation of an azetidine,
75, and finally concerted rearrangement to the pyrroloindoline
product, 76. The computed energies for the diastereomeric transition
states predicts that the exo product should predominate for both
bromination and selenation.
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