The invention relates to synthesis of hpGRF (Somatocrinin) in liquid phase and to intermediate peptides, comprising: coupling, one after the other and in the order of the sequence of the GRF, the fragments in which: (a) the side acid functions of the aspartic and glutamic acids and the side amine function of the lysine are protected by protector groups stable in the conditions of deprotection of the group Boc, (b) the guanidine function of the arginine is protected by protonation, and (c) the N-terminal amino acid is protected on the amine by the Boc group; selectively eliminating the group Boc from the N-terminal amine of the peptide in phase of elongation by hydrolysis with trifluoroacetic acid, said coupling being effected in an aprotic polar solvent and eliminating, at the end of sequence, all the protector groups by hydrolysis with the aid of a 0.1 to 1M solution of methanesulfonic or trifluoromethanesulfonic acid in trifluoroacetic acid.
本发明涉及在液相中合成hpGRF(
生长激素释放肽)以及包括以下中间肽段的方法:按照GRF序列的顺序,依次耦合各片段,其中:(a)通过稳定的保护基保护
天冬氨酸和谷
氨酸的侧链酸性功能以及赖
氨酸的侧链胺基功能,以防止在去除Boc基团的条件下发生脱保护反应;(b)通过质子化来保护精
氨酸的
胍基功能;(c)通过Boc基团在
氨基上保护N-末端
氨基酸。在伸长相的肽段中,通过
三氟乙酸水解选择性地消除肽段N-末端
氨基上的Boc基团。该耦合在无
水极性溶剂中进行,最终在序列结束时,通过在
三氟乙酸中使用0.1至1M的
甲烷磺酸或
三氟甲磺酸溶液
水解去除所有保护基。