1,3-Dipolar cycloadditions of N-benzyl nitrone 12 to D-glycero _-lactone 13 and to D-threo _-lactone 14 proceed with excellent stereoselectivity to provide only one adduct in each case, 16 and 17, respectively. The same reaction performed with L-erythro _-lactone 15 afforded two stereoisomers 18 and 19 in the ratio ca. 2.5:1. Cycloadducts 16-19 were subsequently subjected to a sequence of reactions involving hydrogenolysis of the N-O bond and intramolecular alkylation of the nitrogen atom by C-4 or C-5 carbon atom of the sugar backbone to afford 1,2-dideoxy iminosugars 25, 31, 38, 44 and 50 with a protected hydroxymethyl group at C-2 carbon atom.
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