For the synthesis of bovine proinsulin, the S-sulfonate of the Ala–Leu–Glu–Leu–Ala–Gly–Gly–Pro–Gly–Ala–Gly–Gly–Leu–Glu–Gly–Pro–Pro–Gln–Lys[Z(2-Cl)]–Arg–A-chain, which corresponds to positions 41–81 of bovine proinsulin, was coupled with Boc–Arg(Tos)–Arg(Tos)–Glu(OBut)–Val–Glu(OBut)–Gly–Pro–Gln–Val–Gly–N3. The S-sulfonate of the Arg(Tos)–Arg(Tos)–Glu–Val–Glu–Gly–Pro–Gln–Val–Gly–Ala–Leu–Glu–Leu–Ala–Gly–Gly–Pro–Gly–Ala–Gly–Gly–Leu–Glu–Gly–Pro–Pro–Gln–Lys[Z(2-Cl)]–Arg–A-chain, correspoding to positions 31–81 of bovine proinsulin, was obtained in a pure form by removal of the protecting groups from the coupled product and chromatography on QAE-Sephadex A-25.
Boc-Arg(Tos)-Arg(Tos)-Glu(OBut)-Val-Glu(OBut)-Gly-Pro-Gln-Val-Gly-N3 与牛脯
胰岛素的 41-81 位相对应。通过去除偶联产物中的保护基团并在 QAE-Sephadex A-25 上进行
色谱分析,得到了 Arg(Tos)-Arg(Tos)-Glu-Val-Glu-Gly-Pro-Gln-Val-Gly-Ala-Leu-Glu-Leu-Ala-Gly-Gly-Pro-Gla-Gly-Leu-Glu-Gly-Pro-Gln-Lys[Z(2-Cl)]-Arg-A 链的 S-
磺酸盐纯品,它对应于牛脯脯
氨酸的 31-81 位。