Synthesis of a Hydroxyethylene Isostere of the Tripeptide Arg-Gly-Leu via a Convergent Acyl-like Radical Addition Strategy
作者:Christina M. Jensen、Karl B. Lindsay、Peter Andreasen、Troels Skrydstrup
DOI:10.1021/jo0505775
日期:2005.9.1
important fragment of a novel cyclic-peptide-based uPA inhibitor, was synthesized in few steps employing as the key step a samarium diiodide promoted coupling of either the 4-thiopyridyl ester of Nα-Fmoc- or Nα-Cbz-protected l-ornithine with the N-acryloyl derivative of l-leucine methyl ester. Epimerization under the coupling conditions at the chiral center in the α-position to the ketone was demonstrated