Herein we report an intermolecular propargylic C-H amination of alkynes. This reaction is operationally convenient and requires no transition metal catalysts or additives. Terminal, silyl, and internal alkynes bearing a...

Heparan sulfate (HS) glycosaminoglycans are widely expressed on the mammalian cell surfaces and extracellular matrices and play important roles in variety of cell functions. Studies on the structure-activity relationships of HS have long been hampered by the challenges in obtaining chemically defined HS structures with unique sulfation patterns. Here, we report a new approach to HS glycomimetics based on iterative assembly of clickable disaccharide building blocks that mimic the disaccharide repeating units of native HS. Variably sulfated clickable disaccharides were facilely assembled into a library of mass spec-sequencible HS-mimetic oligomers with defined sulfation patterns by solution-phase and solid-phase iterative syntheses. Microarray and surface plasmon resonance (SPR) binding assays corroborated with the molecular dynamic (MD) simulation and confirmed that these HS-mimetic oligomers bind protein fibroblast growth factor 2 (FGF-2) in a sulfation-dependent manner consistent with that of the native HS. This work established a general approach to HS glycomimetics that can potentially serve as alternatives to native HS in both fundamental research and disease models.

Heparan sulfate (HS) glycosaminoglycans are widely expressed on the mammalian cell surfaces and extracellular matrices and play important roles in variety of cell functions. Studies on the structure-activity relationships of...