Revisiting Glycosylations Using Glycosyl Fluoride by BF<sub>3</sub>·Et<sub>2</sub>O: Activation of Disarmed Glycosyl Fluorides with High Catalytic Turnover
Catalytic glycosylations with glycosylfluorides using BF3·Et2O are presented. Glycosylations with both armed and disarmed donors were efficiently catalyzed by 1 mol% of BF3·Et2O in a nitrogen-filled glovebox without the use of dehydrating agents. Our finding is in sharp contrast with conventional BF3·Et2O-mediated glycosylations, where excess Lewis acid and additives are required. Mechanistic studies
treatment with antibodies (Abs) is one of the most successful therapeutic strategies for obtaining high selectivity. In this study, α‐gal–Ab conjugates were developed that dramatically increased cellular cytotoxicity by recruitingnatural Abs through the interaction between α‐gal and anti‐gal Abs. The potency of the α‐gal–Ab conjugates depended on the amount of α‐gal conjugated to the antibody: the larger
Acetamide (NHAc) is tentatively converted to diacetylimide (NAc2) during oligosaccharide construction. Formation of hydrogen bonds through NHAc in GlcNAc was confirmed by NMR measurements, and N,N‐diacetyl protection improved the reactivity in glycosylation to realize the efficient construction of glycans.