olefination. The target compound Boc-[ProM-19]-OMe was then prepared via subsequent peptide coupling and Ru-catalyzed ring-closing metathesis steps employing (S)-N-Boc-allylgylcine and cis-5-vinyl-proline methyl ester as additional building blocks. In addition, Ac-[2-Cl-Phe]-[Pro]-[ProM-19]-OMe was prepared by solution phase peptide synthesis as a potential ligand for the ena-VASP EVH1 domain.
开发了新的四环支架 ProM-19 的合成,它代表冻结在 P
PII 螺旋构象中的 XPP 三肽单元。作为关键组成部分,N -Boc-保护的乙基 (1 S ,3 S ,4 R )-
2-氮杂双环[2.2.1]hept-5-ene-2-carboxylate 通过非对映选择性氮杂-Diels-Alder 制备反应和随后的手性N -1-苯乙基取代基在双键的临时保护下通过双羟基化和通过 Corey-Winter 烯烃化重建的氢解去除。目标化合物 Boc-[ProM-19]-OMe 然后通过随后的肽偶联和 Ru 催化的闭环置换步骤使用 ( S )-N -Boc-allylgylcine 和cis -5-vinyl-proline methyl ester 作为额外的结构单元。此外,Ac-[2-Cl-Phe]-[Pro]-[ProM-19]-OMe 通过溶液相肽合成制备,作为 ena-VA
SP EVH1