Rapid Peptide Synthesis in Liquid Phase. Preparation of Angiotensin II and Delta-sleep-inducing Peptide by the “Hold-in-Solution” Method
作者:Sukekatsu Nozaki、Ichiro Muramatsu
DOI:10.1246/bcsj.55.2165
日期:1982.7
A new technique for rapid peptide synthesis has been demonstrated by the preparation of a protected angiotensin II, Z–Asp(OBzl)–Arg(NO2)–Val–Tyr(Bzl)–Ile–His(Bzl)–Pro–Phe–OBzl (1), and a protected delta-sleep-inducing peptide, Z–Trp–Ala–Gly–Gly–Asp(OBzl)–Ala–Ser(Bzl)–Gly–Glu(OBzl)–OBzl (2). Elongation of the peptide chain was carried out in 1,2-dichloroethane by repeating the following series of operations: acylation of a benzyl ester of amino acid or peptide with Boc-amino acid by 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide hydrochloride and 1-hydroxybenzotriazole; washing of the organic layer; acidolysis of the α-amino protector; neutralization; and washing. Throughout the synthesis, the growing pep tides were held in the organic layer without being isolated. The protected peptides, 1 and 2, were obtained in overall yields of 78% and 53% based on their C-terminal amino acid esters, and were then hydrogenated to give angiotensin II and delta-sleep-inducing peptide, respectively, thus demonstrating the usefulness of this method for rapid peptide synthesis.
通过制备保护型血管紧张素II(Z-Asp(OBzl)-Arg(NO2)-Val-Tyr(Bzl)-Ile-His(Bzl)-Pro-Phe-OBzl,化合物1)和保护型δ睡眠诱导肽(Z-Trp-Ala-Gly-Gly-Asp(OBzl)-Ala-Ser(Bzl)-Gly-Glu(OBzl)-OBzl,化合物2),展示了一种新的快速肽合成技术。在1,2-二氯乙烷中,通过重复以下操作序列来延长肽链:使用1-乙基-3-(3-二甲基氨基丙基)碳二亚胺盐酸盐和1-羟基苯并三唑对氨基酸或肽的苄酯进行Boc-氨基酸的酰化;清洗有机层;α-氨基保护基的酸解;中和;以及清洗。在整个合成过程中,生长中的肽链始终保持在有机层中而不被分离。保护型肽1和2分别以其C端氨基酸酯为基准,得到了78%和53%的总收率,随后经过氢化分别得到了血管紧张素II和δ睡眠诱导肽,从而证明了这种方法在快速肽合成中的实用性。