No abstract

The title compound, C19H26O8S, has been synthesized from 2,3:4,5-di-O-isopropyl­idene-β-d-fructopyran­ose. The absolute configuration of the fused ring is confirmed by anomalous dispersion effects in the diffraction measurement. The six-membered β-fructopyran­ose ring has a twist-boat conformation with the two five-membered rings trans to each other. In the crystal, inter­molecular non-classical C—H⋯O hydrogen bonds link the mol­ecules into a three-dimensional network.

The nucleophilic substitution of carbohydrate imidazylates (imidazole‐1‐sulfonates) (III) and (VI) with N‐heterocyclic compounds (II) furnishes title compounds (V) and (VII), resp., in good yields.

The title compound, C13H15NO2, was synthesized from 3,5-dimeth­oxy­benzaldehyde. The dihedral angle between the pyrrole and benzene rings is 89.91 (5)°. In the crystal, weak C—H⋯O and C—H⋯π interactions link the mol­ecules into a three-dimensional network.

The title compound C23H29NO5, synthesized by the Amadori rearrangement of α-d-glucose with dibenzyl­amine and the ketalization, is shown to be a β-anomer. The fructopyran­ose ring adopts a chair conformation. The two benzene rings form a dihedral angle of 68.9 (1)°. In the crystal, non–classical inter­molecular C—H⋯O hydrogen bonds link the mol­ecules into a three–dimensional network.