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)及其中间肽段的方法,包括以下步骤:
1. 按照GRF序列的顺序,依次连接肽段,其中:
(a)使用在去保护Boc基团的条件下稳定的保护基团保护
天冬氨酸和谷
氨酸的侧链酸基团和赖
氨酸的侧链胺基团;
(b)使用质子化保护精
氨酸的
鸟氨酸基团;
(c)使用Boc基团保护N-末端
氨基酸的胺基团。
2. 在无极性极性溶剂中进行耦合,并在延伸阶段通过
三氟乙酸水解有选择地去除肽的N-末端胺基酸上的Boc基团。
3. 在序列末端,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团。