Abstract

Abstract Treatment with triiodoimidazole and triphenylphosphine of 2, 3, 5, 6-tetra-O-benzyl-D-mannose diethyl dithioacetal, obtained in three standard reaction steps from methyl α-D-mannofuranoside. gave ring closure to ethyl 2, 3, 5, 6-tetra-O-benzyl-1, 4-dithio-α-D-talo-furanoside, with sulfur in the furanose ring.

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