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There is a growing need for the synthesis of non-natural Lsugars and naturally occurring rare L-sugars because of the medicinal potential of L-carbohydrates and related nucleosides due to their potent biological activity and lower toxicity compared to their D-counterparts. 1 L-Sugars are also used as the building block for the synthesis of L-oligonucleotides and enantio-DNA (DNA having L-sugar), which are valuable tools for studying protein-DNA interactions and are promising antisense agents. 2 Although certain L-sugars such as L-fucose, L-rhamnose, and L-arabinose are quite abundant in nature, L-galactose is a rare sugar and occurs as a minor component in agar-agar, chagual gum, red algae, flaxseed mucilage and a snail galactan. 3 There have been reports for the synthesis of L-galactose: (i) a synthesis by reduction of L-galactono-1,4-lactone, 4 (ii) a method based on the repeated asymmetric epoxidation starting from achiral 2-butene-1,4-diol, 5 (iii) a synthesis employing the Pummerer rearrangement starting from 6S-phenyl-6-thioD-galactose, 6

A New Efficient Method for the Synthesis of L-Galactose