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(A) 2,3-anhydrosugar donors 18a/18b and their use in the synthesis of β-arabinofuranosides (20). (B) Postulated complex (21) formed in (−)-sparteine-mediated nucleophilic opening of O-5 deprotonated 2,3-anhydro-β-d-lyxofuranosides (e.g., 19) by lithium alkoxides.
