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Synthesis Of Enantioenriched Indolines By A Conjugate Addition/Asymmetric Protonation/Aza-Prins Cascade Reaction.

Blake E. Daniels, Jane Ni, S. Reisman
Published 2016 · Chemistry, Medicine

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A conjugate addition/asymmetric protonation/aza-Prins cascade reaction has been developed for the enantioselective synthesis of fused polycyclic indolines. A catalyst system generated from ZrCl4 and 3,3'-dibromo-BINOL enables the synthesis of a range of polycyclic indolines in good yields and with high enantioselectivity. A key finding is the use of TMSCl and 2,6-dibromophenol as a stoichiometric source of HCl to facilitate catalyst turnover. This transformation is the first in which a ZrCl4 ⋅BINOL complex serves as a chiral Lewis-acid-assisted Brønsted acid.
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