title: O-Benzoxazolyl imidates as versatile glycosyl donors for chemical glycosylation.
abstract: Herein, we report a new class of glycosyl donors, benzoxazolyl imidates, for chemical glycosylation. The O-benzoxazolyl (OBox) leaving group was designed with an aim to compare the relative reactivity and stability of similarly structured S-benzoxazolyl (SBox) glycosides (thioimidates) developed in our lab and glycosyl trichloroacetimidates (TCAI, O-imidates) developed by Schmidt. Novel OBox donors can be activated under catalytic conditions and provided excellent yields in glycosylation. The OBox imidates were found to be more reactive than either SBox or TCAI donors. The high reactivity profile was confirmed in direct competitive experiments and was found beneficial for HPLC-assisted solid-phase synthesis.
authors.affiliation: Department of Chemistry and Biochemistry, University of Missouri - St. Louis, One University Boulevard, St. Louis, Missouri 63121, USA.
authors.forename: Swati S
authors.initials: SS
authors.lastname: Nigudkar
authors.forename: Archana R
authors.initials: AR
authors.lastname: Parameswar
authors.forename: Papapida
authors.initials: P
authors.lastname: Pornsuriyasak
authors.forename: Keith J
authors.initials: KJ
authors.lastname: Stine
authors.forename: Alexei V
authors.initials: AV
authors.lastname: Demchenko
mesh_terms: D002236:Carbohydrate Conformation; D006031:Glycosylation; D007096:Imidoesters / Q000138:chemical synthesis* / Q000737:chemistry*
chemical_list: D007096:Imidoesters