title: Direct thiophenylation accompanying orthoester-cleavage of 1,2,4-O-orthoacetyl-3,6-O-(o-xylylene)glucopyranose.
abstract: The 3,6-O-(o-xylylene) bridge locks the conformation of glucopyranose to an axial-rich form. Although the conformational lock induces complete β-selectivity in a glycosylation reaction, the leaving group of the glycosyl donor is limited to fluorine. On the other hand, the bridge confers the furanose-preferred property to glucose, which makes synthesis of corresponding pyranosyl derivatives that equip various leaving groups difficult. This problem was solved through direct phenylthio glucosidation of 3,6-O-(o-xylylene)-1,2,4-O-orthoacetylglucose accompanying cleavage of the orthoester moiety. This paper describes the process of establishing direct thiophenylation. This process reduced the synthetic steps for the known glucopyranosyl fluoride and will expand application of conformationally locked glycosyl donors.
authors.affiliation: School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan.
authors.forename: Takuya
authors.initials: T
authors.lastname: Uchino
authors.affiliation: School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan.
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Tomabechi
authors.affiliation: School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Fukumoto
authors.affiliation: School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan. Electronic address: hidetosh@kwansei.ac.jp.
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Yamada
mesh_terms: D004952:Esters; D005947:Glucose / Q000737:chemistry*; D005960:Glucosides / Q000737:chemistry*; D006031:Glycosylation; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D013696:Temperature
chemical_list: D004952:Esters; D005960:Glucosides; D013438:Sulfhydryl Compounds; D005947:Glucose
keywords: Axial-rich; Conformation; Orthoester; Thiophenylation; o-Xylylene