title: Efficient synthesis of beta-D-mannosides and beta-D-talosides by double parallel or double serial inversion.
abstract: A neighboring equatorial ester group plays a highly important role in the Lattrell-Dax (nitrite-mediated) carbohydrate epimerization reaction, inducing the formation of inversion compounds in good yields. On the basis of this effect, efficient synthetic routes to beta-D-mannosides and beta-D-talosides, from the corresponding beta-D-galactosides and beta-D-glucosides, have been designed. The present routes are based on multiple regioselective acylation via the respective stannylene intermediates, followed by inversions to the corresponding manno- and talopyranoside structures by nitrite or acetate substitution. It was found that the ester group was able to induce the inversion of its two neighboring groups in high yields following either a double parallel or a double serial inversion process. By combination of direct inversion, and neighboring- as well as remote-group participation, several beta-d-mannoside and beta-D-taloside derivatives were very conveniently obtained in good yields.
authors: KTH - Royal Institute of Technology, Department of Chemistry Teknikringen 30, S-10044, Stockholm, Sweden.
authors: Hai
authors: H
authors: Dong
authors: Zhichao
authors: Z
authors: Pei
authors: Marcus
authors: M
authors: Angelin
authors: Styrbjörn
authors: S
authors: Byström
authors: Olof
authors: O
authors: Ramström
mesh_terms: D004952:Esters / Q000737:chemistry; D006027:Glycosides / Q000138:chemical synthesis* / Q000737:chemistry; D008745:Methylation; D015394:Molecular Structure; D009573:Nitrites / Q000737:chemistry; D011134:Polysaccharides / Q000138:chemical synthesis / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D004952:Esters; D006027:Glycosides; D009573:Nitrites; D011134:Polysaccharides