<i>N</i>-(Cbz- and Fmoc-α-aminoacyl)benzotriazoles: Stable Derivatives Enabling Peptide Coupling of Tyr, Trp, Cys, Met, and Gln with Free Amino Acids in Aqueous Media with Complete Retention of Chirality
作者:Alan R. Katritzky、Parul Angrish、Deniz Hür、Kazuyuki Suzuki
DOI:10.1055/s-2005-861782
日期:——
Crystalline, chirally stable N-(Cbz- and Fmoc-α-aminoacyl)benzotriazoles 2a-f, activated derivatives of Tyr, Trp, Cys, Met and Gln undergo peptide coupling in aqueous media with unprotected l-Ala-OH and l-Phe-OH to give the chiral dipeptides in 70-98% yield. A convenient and efficient procedure under mild reaction conditions for the preparation of 2a-f in 72-95% yield utilizes N-Cbz- or N-Fmoc-protected α-amino acids 1a-f.
晶体、手性稳定的N-(Cbz和Fmoc-α-氨基酰基)苯并三唑2a-f,是Tyr、Trp、Cys、Met和Gln的活化衍生物,在含水介质中与未保护的L-Ala-OH和L-Phe-OH发生肽偶联反应,生成手性二肽,产率为70-98%。一种方便高效的制备2a-f的方法是在温和反应条件下,利用N-Cbz或N-Fmoc保护的α-氨基酸1a-f,产率为72-95%。