title: Synthesis, characterisation and crystal structures of Schiff bases from the reaction of 4,6-O-ethylidene-beta-D-glucopyranosylamine with substituted salicylaldehydes.
abstract: Multiple chemical modifications were carried out on D-glucose to result in the corresponding Schiff bases. Such modifications performed on D-glucose not only helped in increasing the solubility of the products in nonaqueous solvents, but also restricted the anomerisation of the saccharide moiety in solution. NMR study of the products revealed the presence of the beta-anomeric form of the saccharide moiety in Me(2)SO solution. All the compounds were characterised by analytical and spectral methods. The literature is devoid of any crystal structures of saccharide-Schiff base combinations of the type reported in this paper. The crystal structures of these molecules exhibited a tridentate, ONO binding core. These studies further revealed that the compounds in the solid state were in the beta-D-pyranose form with the (4)C(1) chair conformation. The compounds exhibited interesting lattice structures assisted through weak interactions of the type O-H...O and C-H...O. The lattice structure of one of these compounds exhibited channels filled with chloroform molecules.
authors.affiliation: Bioinorganic Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India.
authors.forename: A K
authors.initials: AK
authors.lastname: Sah
authors.forename: C P
authors.initials: CP
authors.lastname: Rao
authors.forename: P K
authors.initials: PK
authors.lastname: Saarenketo
authors.forename: E
authors.initials: E
authors.lastname: Kolehmainen
authors.forename: K
authors.initials: K
authors.lastname: Rissanen
mesh_terms: D000447:Aldehydes / Q000737:chemistry* / Q000378:metabolism*; D002236:Carbohydrate Conformation; D018360:Crystallography, X-Ray; D005944:Glucosamine / Q000031:analogs & derivatives / Q000737:chemistry / Q000378:metabolism*; D006574:Heterocyclic Compounds, 2-Ring / Q000737:chemistry / Q000378:metabolism*; D006860:Hydrogen Bonding; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D012545:Schiff Bases / Q000138:chemical synthesis* / Q000737:chemistry*; D013053:Spectrophotometry; D017550:Spectroscopy, Fourier Transform Infrared; D013237:Stereoisomerism
chemical_list: C439754:4,6-O-ethylideneglucopyranosylamine; D000447:Aldehydes; D006574:Heterocyclic Compounds, 2-Ring; D012545:Schiff Bases; C013243:salicylaldehyde; D005944:Glucosamine