New process for the synthesis of N alpha-fluorenylmethoxycarbonyl-Ng-trityl-arginine
申请人:SCLAVO S.p.A.
公开号:EP0375047A2
公开(公告)日:1990-06-27
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。