Stereoselective alkoxylation of acyclic precursor, (2S,3S)-2,3-O-isopropylidene-4-chloro-4-phenylthiobutyric acid methyl ester (3) in the presence of SnCl2–AgClO4, followed by Pd(OAc)2 promoted cyclization gave α-l-threofuranosides in good yields.
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Mukaiyama et al. (1982) studied this question.
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