Methyl glycopyranosides with diallylamino and mesylate groups in relationship undergo an intramolecular reaction in which the amino group assists the replacement of the mesylate group by a nucleophile. Such a reaction may result in a 1,2-shift of the nitrogen atom depending on which carbon atom of the intermediate aziridinium ion is attacked by the nucleophile. A further N,N-dideallylation using palladium
Abstract The four methyl 2-amino-2,4-dideoxy- dl -pentopyranosides were synthesized starting from tetrahydro-2-methoxypyran-3-one. The introduction of a functional group at C-4 of the pyran ring was obtained by formation of the 3-dibenzylenamine derivative, hydroboration, oxidation, and catalytic di- N -debenzylation, giving methyl 2-acetamido-2,4-dideoxy-α- and -β- dl - threo -pentopyranosides. Isomerization