title: A cyclic enamine derived from 1,2-O-isopropylidene-alpha-D-xylofuranose as a novel carbohydrate intermediate to achieve skeletal diversity.
abstract: The commercially available carbohydrate 1,2-O-isopropylidene-alpha-D-xylofuranose was efficiently transformed into the high-added-value synthetic scaffold 8. The transformation requires the synthesis of the 5-O-tosyl derivative 7 and its subsequent intramolecular cyclization under basic conditions to give the cyclic enamine 8. Reaction of 8 with O-, N-, S-, and C-nucleophiles and amino acids allowed its efficient transformation (one-step, high yields, and easy purifications) into fused cyclic sugar derivatives with rather unusual molecular skeletons in a completely regio- and stereoselective manner. The characteristics of the sugar derivative 8 established here, high reactivity, synthetic accessibility, and the potential for conversion into a vast collection of products by the action of different nucleophiles, indicate that it will prove to be a useful chiral intermediate for achieving skeletal diversity. The constrained structures and dense functionalization of the polycyclic sugar derivatives generated from 8 make these compounds promising candidates for use as starting agents for the production of new analogues and as drugs.
authors.affiliation: Instituto de Química Médica (C.S.I.C.), Juan de la Cierva 3, 28006 Madrid, Spain.
authors.forename: Alessandra
authors.initials: A
authors.lastname: Cordeiro
authors.forename: Ernesto
authors.initials: E
authors.lastname: Quesada
authors.forename: María-Cruz
authors.initials: MC
authors.lastname: Bonache
authors.forename: Sonsoles
authors.initials: S
authors.lastname: Velazquez
authors.forename: María-José
authors.initials: MJ
authors.lastname: Camarasa
authors.forename: Ana
authors.initials: A
authors.lastname: San-Félix
mesh_terms: D000588:Amines / Q000737:chemistry*; D003500:Cyclization; D006571:Heterocyclic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D008968:Molecular Conformation; D009005:Monosaccharides / Q000737:chemistry*; D018894:Reverse Transcriptase Inhibitors / Q000138:chemical synthesis* / Q000737:chemistry; D013141:Spiro Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: C516586:1,2-isopropylidene-alpha-D-xylofuranose; D000588:Amines; D006571:Heterocyclic Compounds; D009005:Monosaccharides; D018894:Reverse Transcriptase Inhibitors; D013141:Spiro Compounds