Introduction Roles of Glycosyl Phosphates Mimics of Natural Phosphates Mimics of Glycosyl Phosphates Direct Methods of Glycosyl Methylphosphonate Synthesis Indirect Methods of Glycosyl Methylphosphonate Synthesis Synthesis of C-Glycosyl Halides Conversion of C-Glycosyl Halides into Phosphonates Mimics of N-Acetyl-α-D-Glucosamine 1-Phosphate and N-Acetyl-α-D-Mannosamine-Phosphate The Biological Roles Synthesis Conclusion References