A Racemization-Free Coupling Method for Peptides Having N-Methylamino Acids at the Carboxy-Termini.
作者:Yasuhiro NISHIYAMA、Masaru TANAKA、Shoubu SAITO、Sou ISHIZUKA、Tomonori MORI、Keisuke KURITA
DOI:10.1248/cpb.47.576
日期:——
To search for recemization-free coupling conditions for peptides having N-alkylamino acids at the carboxy-termini, a model coupling using Boc-Phe-MeAla-OH (MeAla, N-methylalanine) and H-Phe-OBzl was studied. When benzotriazolyl-N-oxytris(dimethylamino)phosphonium hexafluorophosphate or O-(7-azabenzotriazol-1-yl)-1, 1, 3, 3, -tetramethyluronium hexafluorophosphate was employed as a coupling reagent, no additives so far examined could sufficiently suppress the racemization of the carboxy-terminal MeAla residue. Though N-hydroxy compounds were not satisfactorily effective also in 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (WSCI)-mediated coupling, CuCl2 could eliminate the racemization of MeAla in the coupling with WSCI even at room temperature.
为了寻找不含消旋化反应的肽偶联条件,特别是针对在羧基末端含有N-烷基氨基酸的肽,研究了一种使用Boc-Phe-MeAla-OH(MeAla代表N-甲基丙氨酸)和H-Phe-OBzl的模式偶联。当使用苯并三唑基-N-氧化三(二甲氨基)磷酸六氟磷酸盐或O-(7-氮杂苯并三唑-1-基)-1,1,3,3,-四甲基脲六氟磷酸盐作为偶联试剂时,迄今为止检查过的任何添加剂都无法充分抑制羧基末端MeAla残基的消旋化。虽然在1-乙基-3-(3-二甲氨基丙基)碳二亚胺盐酸盐(WSCI)介导的偶联中,N-羟基化合物的效果并不令人满意,但CuCl2即使在室温下也能消除通过WSCI进行偶联时的MeAla消旋化。