The 2-(p-biphenylyl)-2-propyloxycarbonyl (Bpoc) group was examined as an Nα-protecting group in the stepwise assembly of the MAP Kinase ERK2 [178–188; Thr(P)183, Tyr(P)185] peptide. The mild acid deprotection of the Bpoc group permitted (i) incorporation of a fully protected phosphothreonyl derivative and (ii) a TFA-based final cleavage step. The first five C-terminal residues (184–188) were incorporated in the Fmoc mode of peptide synthesis, with all subsequent amino acids coupled as their Bpoc–Xxx–OH derivatives. The target product was obtained in high purity and yield, indicating that a Bpoc-based approach to phosphopeptide synthesis was compatible with both the acid-labile side chain protecting groups employed and Hmp–Wang resin.
在分步组装
MAP 激酶 ERK2 [178-188; Thr(P)183, Tyr(P)185] 肽的过程中,对 2-(对
联苯基)-2-丙氧基羰基 (Bpoc) 作为 Nα 保护基进行了研究。通过对 Bpoc 基团进行温和的酸性脱保护,可以(i) 加入完全保护的
磷苏酰基衍
生物,(ii) 进行基于反式
脂肪酸的最终裂解步骤。前五个 C 端残基(184-188)以 Fmoc
多肽合成模式合成,随后的所有
氨基酸均以 Bpoc-Xxx-OH 衍
生物的形式连接。目标产物的纯度和产量都很高,这表明基于 Bpoc 的
磷酸肽合成方法与所使用的酸性侧链保护基团和 Hmp-Wang
树脂都是兼容的。