Ag eneral and efficient strategy for synthesis of tri-, hexa-and heptasaccharidic substructures of the lipopolysaccharide of Providencia rustigianii O34 is described. For the heptasaccharide seven different buildingb locks were employed. Special features of the structures are an a-linked galactosaminea nd the two embedded a-fucose units,w hich are either branched at positions-3 and -4 or furtherl inked at their 2-position. Convergent strategies focused on [4+ +3], [3+ +4],a nd [4+ +2+ +1] couplings. Whereas the [4+ +3] and [3+ +4] coupling strategies failed the [4+ +2+ +1] strategy wass uccessful. As monosaccharidic buildingblocks trichloroacetimidates and phosphates weree mployed.G lobal deprotection of the fully protected structures was achieved by Birch reaction. [ + + ] These authors contributed equally to this work. Supporting information and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.Scheme6.Synthesis of the tetrasaccharideacceptor 32. Scheme7.Synthesis of the disaccharide 33. Scheme8.Synthesis of the d-galactosyl donor 10. Scheme9.Synthesis of the trisaccharide phosphates 45 and 46. Scheme10. Synthesis of disaccharide trichloroacetimidate 2. Scheme11. Synthesis of heptasaccharide 49 using a[ 4+ +2+ +1] strategy.Scheme12. Global deprotection to tri-and hexasaccharides 51 and 53.Scheme13. Synthesis of heptasaccharide 1.