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A carbohydrate-based oxepine, derived from 2-deoxy-d-arabino-hexopyranose, was used to prepare a family of septanosyl-1,2,3-triazoles in four steps. DMDO mediated epoxidation of the oxepine followed by trapping of the intermediate 1,2-anhydroseptanose by sodium azide gave the β-substituted glycosyl azide. The septanosyl azide was then reacted with a number of alkynes under thermal Huisgen or copper(I)...
The synthesis and X-ray crystal structure of a d-xylose-based oxepine (9) are reported. The oxepine was prepared from 2,3,4-tri-O-benzyl-d-xylose by the three-step sequence (Wittig olefination, vinyl ether formation, and ring closing metathesis) we recently reported. Epoxidation of this cyclic enol ether (9) using dimethyldioxirane (DMDO) gave 1,2-anhydro-β-d-idoseptanose (10), which was trapped by...
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