A New Strategy for Oligosaccharide Assembly Exploiting Cyclohexane-1,2-diacetal Methodology: An Efficient Synthesis of a High Mannose Type Nonasaccharide
                                
                                    
                                        作者:Peter Grice、Steven V. Ley、Jörg Pietruszka、Helen M. I. Osborn、Henning W. M. Priepke、Stuart L. Warriner                                    
                                    
                                        DOI:10.1002/chem.19970030315
                                    
                                    
                                        日期:——
                                    
                                    AbstractThe high‐mannose nonasaccharide 1 is part of the glycoprotein gp 120 of the viral coat of HIV‐1. The mannan portion of this triantennary glycan was prepared by a number of consecutive glycosidation steps without the need for any protecting‐group manipulation. This was achieved by carefully tuning the reactivity of the glycosyl donors by employing our cyclohexane‐1,2‐diacetal (CDA) methodology. The method was further extended with one‐pot procedures for oligosaccharide synthesis, thus reducing the number of steps to form the protected nonasaccharide 21 from the monosaccharide building blocks to five.