5-Oxohexanoic Acid Ethyl Ester is a useful synthetic intermediate. It is used to prepare tyrosine-derived RGD peptidomimetics containing oligoethylene glycol (OEG) spacers. It is also used to synthesize constrained glycyl amides derived from RGD tripeptide as nonpeptide αvβ3 antagonists.
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Rerat, V., et al.: J. Med. Chem., 52, 7029 (2009); Meissner, R., et al.: Bioorg. Med. Chem. Lett., 12, 25 (2001)