An improvement is described in the synthesis method for Nα-trityl-NG-trityl-arginine within a process for preparing Nα-fluorenylmethoxycarbonyl-NG-trityl-arginine from arginine, comprising:
a) forming Nα-trityl-NG-trityl-arginine
b) selectively detaching the trityl group from the α-NH₂ and
c) introducing the fluorenylmethoxycarbonyl group in its place.
The improvement consists of preparing the Nα-trityl-NG-trityl-arginine by solubilizing the arginine in an aprotic organic solvent by tri-alkylsilylation both of the amino nitrogen and of the carboxyl group, followed by tritylation, with trityl chloride, of the α-amino nitrogen, and of the guanidino group after deprotonating this latter with a bicyclic guanidine.
The new improved process can also lead to variable quantities of the arginine analogue di-tritylated at the guanidino group, namely Nα-fluorenylmethoxycarbonyl-NG-di-trityl-arginine. This new compound, to which the present invention also relates, can also be used as such in peptide synthesis.
在从精
氨酸制备 Nα-
芴甲氧羰基-NG-三苯甲基-精
氨酸的工艺中,对 Nα-三苯甲基-NG-三苯甲基-精
氨酸的合成方法进行了改进,包括: 1:
a) 形成 Nα-三苯甲基-NG-三苯甲基-精
氨酸
b) 选择性地将三苯甲基与 α-NH₂ 分离,以及
c) 在其位置上引入
芴甲氧羰基。
改进的方法包括:在非烷基有机溶剂中通过
氨基氮和羧基的三烷基
硅烷化使精
氨酸溶解,然后用三酰
氯对α-
氨基氮和
胍基进行三烷基化,最后用双环
胍对
胍基进行去质子化,从而制备出 Nα-三苯甲基-NG-三苯甲基-精
氨酸。
改进后的新工艺还可以制备出不同数量的在
胍基上二三苯甲基化的精
氨酸类似物,即 Nα-
芴甲氧羰基-NG-二三苯甲基-精
氨酸。本发明所涉及的这种新化合物也可用于肽合成。