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Stereochemical control in the reduction of 2-chromanols.


ABSTRACT: [reaction: see text] Reduction of C5-substituted 2-hydroxychromans selectively provides 2,4-cis-chromans using large silane reductants and 2,4-trans-chromans using the smaller silane PhSiH(3). The stereochemical outcome has been rationalized on the basis of a Curtin-Hammett kinetic situation arising from hydride delivery to two different conformations of an intermediate oxocarbenium ion. This method provides a powerful way to control the relative stereochemistry of these substructures which are prevalent in bioactive natural products.

SUBMITTER: Li K 

PROVIDER: S-EPMC2538801 | BioStudies | 2006-01-01

REPOSITORIES: biostudies

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