Synthesis and NMR studies on the ABO histo-blood group antigens: synthesis of type III and IV structures and NMR characterization of type I-VI antigens.

The ABO histo-blood group antigens are best known for their important roles in solid organ and bone marrow transplantation as well as transfusion medicine. Here we report the synthesis of the ABO type III and IV antigens with a 7-octen-1-yl aglycone. Also described is an NMR study of the ABO type I to VI antigens, which were carried out to probe differences in overall conformation of the molecules. These NMR investigations showed very little difference in the (1)H chemical shifts, as well as (1)H-(1)H coupling constants, across all compounds, suggesting that these ABO subtypes adopt nearly identical conformations in solution.