Antineoplastic Agents. 400. Synthesis of the Indian Ocean Marine Sponge Cyclic Heptapeptide Phakellistatin 2,1a
摘要:
Solution-phase synthesis of the marine sponge constituent phakellistatin 2 (1), cyclo(Tyr-Pro-Phe-Prone-Ile-Pro), was completed using a combination of stepwise coupling and (4 + 3) segment condensation. Use of diethyl phosphorocyanidate for the peptide bond formations gave the linear heptapeptide in 54% yield. Cyclization was achieved in high yields utilizing TBTU (2), BOP-C1 (3), PyBroP (4), and HOAt (5), resulting in 50-65% yields of phakellistatin 2 (1) depending on the method employed. The synthetic cyclic peptide was chemically but not biologically identical with the natural product.
Antineoplastic Agents. 400. Synthesis of the Indian Ocean Marine Sponge Cyclic Heptapeptide Phakellistatin 2,1a
摘要:
Solution-phase synthesis of the marine sponge constituent phakellistatin 2 (1), cyclo(Tyr-Pro-Phe-Prone-Ile-Pro), was completed using a combination of stepwise coupling and (4 + 3) segment condensation. Use of diethyl phosphorocyanidate for the peptide bond formations gave the linear heptapeptide in 54% yield. Cyclization was achieved in high yields utilizing TBTU (2), BOP-C1 (3), PyBroP (4), and HOAt (5), resulting in 50-65% yields of phakellistatin 2 (1) depending on the method employed. The synthetic cyclic peptide was chemically but not biologically identical with the natural product.