S1P receptor mediated activity of FTY720 phosphate mimics

Various carboxylic acids, phosphonic acids, sulfonic acids, tetrazoles as well as sulfonylhydantoins were prepared as phosphate mimics of the chiral aminophosphate 1-P to act as agonists on the S1P₁ receptor. It was found that amino phosphonates and amino carboxylates are potent S1P₁ binders. β-Amino acid 11 could be shown to reversibly reduce blood lymphocyte counts in rats after po administration.