Synthesis of Nα-Z, Nβ-Fmoc or Boc protected α-hydrazinoacids and study of the coupling reaction in solution of Nα-Z-α-hydrazinoesters
作者:Isabelle Bouillon、Nicolas Brosse、Régis Vanderesse、Brigitte Jamart-Grégoire
DOI:10.1016/j.tet.2006.12.085
日期:2007.3
The preparation of chiral orthogonally protected N-alpha-Z, N-beta-Fmoc- or Boc-alpha-hydrazinoacids derivatives, directly suitable for SPPS, is described in six steps with good yields starting from the corresponding alpha-aminoacids. The coupling reaction assays performed in liquid phase between N-alpha-Z-hydrazinoesters and N-Fmoc-alpha-aminoacids demonstrated the low reactivity of the hydrazinoester derivatives. However, we found that the acid fluoride method allowed the formation of hydrazinodipeptides almost quantitatively. (c) 2007 Elsevier Ltd. All rights reserved.