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A versatile method for synthesis of chiral furopyran-β-one analogues starting from 1,4:3,6-dianhydrofructose has been developed. The target compounds were acquired by treatment of 1,4:3,6-dianhydrofructose with benzaldehydes in the presence of KF/Al2O3 and subsequent ring expansion of furanones induced by TMSOTf (trimethylsilyl triflate). The ring expansion involves an unprecedented nucleophilic 1,2-migration...
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