Abstract
AbstractIn the presence of a catalytic amount of Ph3C+SbCl6‐ or a catalyst system of Me3SiCl/SbCl5/SnI2, α‐substituted cyclic ethers such as (IV) or (VI) are stereoselectively prepared in a one‐pot procedure involving the addition of the ethoxyethene (II) to the lactones (I) or (V) followed by nucleophilic substitution of the initially formed silylated cyclic hemiacetals with the silyl nucleophiles (III).
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