title: Convenient synthesis of an N-glycan octasaccharide of the bisecting type.
abstract: Convenient synthesis of an N-glycan octasaccharide (A) of the bisecting type was described. The stable and easily prepared orthoester F, 3''-O-chloroacetyl-4'',6''-O-benzylidene-alpha-D-glucopyranose 1'',2''-(chloromethyl 3',6'-di-O-benzyl-2'-deoxy-2'-phthalimido-beta-D-glucopyranosyl-(1-->4)-3,6-di-O-benzyl-2-deoxy-2-phthalimido-beta-D-glucopyranosylazide-4'-yl orthoacetate), was designed as the key intermediate with two advantages: (1) distinguishing OH-2'' from OH-3'' in beta-D-glucopyranoside to construct the central beta-D-mannopyranoside by inverting the configuration of OH-2'' in beta-D-glucopyranoside and (2) distinguishing OH-4'' and OH-6'' from OH-3'' in the beta-D-mannopyranoside to introduce the bisecting GlcNAc residue.
authors.affiliation: Key Laboratory of Marine Drugs, The Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.
authors.forename: Guangfa
authors.initials: G
authors.lastname: Wang
authors.forename: Wei
authors.initials: W
authors.lastname: Zhang
authors.forename: Zhichao
authors.initials: Z
authors.lastname: Lu
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Xiuli
authors.initials: X
authors.lastname: Zhang
authors.forename: Yingxia
authors.initials: Y
authors.lastname: Li
mesh_terms: D005947:Glucose / Q000737:chemistry; D008358:Mannose / Q000737:chemistry; D009844:Oligosaccharides / Q000138:chemical synthesis*; D011134:Polysaccharides / Q000737:chemistry
chemical_list: D009844:Oligosaccharides; D011134:Polysaccharides; D005947:Glucose; D008358:Mannose