Abstract
The cyclic pentapeptide cyclo(-Arg-Gly-Asp- d-Phe-Lys-) is a highly potent and selective inhibitor for the α vβ 3 integrin. A related compound, cyclo(-Arg-Gly-Asp- d-Phe-Val-), is a promising anticancer drug candidate; it inhibits angiogenesis and induces apoptosis in vascular cells. We have developed an improved solid-phase synthesis based on Kessler's procedure to afford cyclo(-RGDfK-) peptide in high purity and high yield in a multi-gram scale. This improved synthesis is environmentally friendly and may be generally applicable to other related cyclic peptide syntheses.
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