High-pressure-promoted Fmoc-aminoacylation of N-ethylcysteine: preparation of key devices for the solid-phase synthesis of peptide thioesters
作者:Yuko Nakahara、Ichiro Matsuo、Yukishige Ito、Risa Ubagai、Hironobu Hojo、Yoshiaki Nakahara
DOI:10.1016/j.tetlet.2009.11.034
日期:2010.1
preparation of peptide thioesters by Fmoc solid-phase peptide synthesis (SPPS) is described. Condensation of Fmoc-aminoacyl fluoride and N-ethyl-S-triphenylmethylcysteine allyl ester, readily prepared from known S-triphenylmethylcysteine allyl ester, was efficiently promoted in CH2Cl2 under high-pressure (800 MPa). When the reaction was performed with the additive DIEA, considerable epimerization at the chiral
在该研究中,描述了Fmoc-氨基酰基-N-乙基-S-三苯基甲基半胱氨酸的合成,该新的N→S酰基迁移装置用于通过Fmoc固相肽合成(SPPS)制备肽硫酯。从已知的S-三苯基甲基半胱氨酸烯丙基酯容易地制备的Fmoc-氨基酰氟和N-乙基-S-三苯基甲基半胱氨酸烯丙基酯的缩合在高压(800MPa)下在CH 2 Cl 2中被有效地促进。当用添加剂DIEA进行反应时,在手性中心发生大量差向异构,得到非对映异构体的混合物。当N为编制程序改变了-乙基-S-三苯基甲基半胱氨酸烯丙基酯,排除了高压反应中的添加剂DIEA,获得了Fmoc-氨基酰基-N-乙基-S-三苯基甲基半胱氨酸,没有差向异构化的单一立体异构体。如此制得的Fmoc-1-亮氨酸加合物被脱酰基并用于已知十肽的SPPS。与通过逐步树脂上Leu-Cys缩合方法获得的7%相比,十肽硫代酯的总收率获得了显着提高(44%)。