Benzylprotected aromatic phosphonic acids for anchoring peptides on titanium.

The development of biocompatible coatings is an ongoing issue. Mimicking the physiological adhesion process of osteoblasts to the extracellular matrix improves cell adhesion of osteoblasts in vitro and results in improved and earlier osseous integration of implants in vivo. Titanium, an often used material in implant surgery, can be easily coated by peptides bearing phosphonic acid groups. We report here, the synthesis of benzyl protected phosphonic acids suitable for solid-phase peptide synthesis (SPPS), which can be easily deprotected with TFA.