Chiral N-protected β-amino alcohols are easily obtained by NaBH4reduction of mixed anhydrides of N-protected α-amino acids in an organic/aqueous medium. The alcohols obtained from side chain or main chain reduction of N-protected aspartic acid are converted in good yields into lactones.
A convenient method for synthesis of Fmoc-amino acid p-nitroanilides based on isobutyl chloroformate as condensation agent.
作者:Hinyu Nedev、Hanitra Nabarisoa、Tomasz Haertle
DOI:10.1016/s0040-4039(00)60527-0
日期:1993.6
Mixed anhydride method with condensationagent isobutyl chloroformate is described for obtaining a series of p-nitroanilides of FMOC-Pro-, FMOC-Ala-, FMOC-Leu-, FMOC-Ile-, FMOC-Trp., FMOC-Asp(OtBu)-, FMOC-Gln(Trt)-, FMOC-Hyp- and FMOC-Hyp(OtBu)- in good yields and in an optical pure form. The use of other activating agents for obtaining p-nitroanilides is discussed.
Synthesis of retro-inverso peptides employing isocyanates of Nα-Fmoc-amino acids/peptide acids catalyzed by DMAP
作者:Rao Venkataramanarao、Vommina V. Sureshbabu
DOI:10.1016/j.tetlet.2006.10.066
日期:2006.12
The Goldschmidt-Wick type reaction between isocyanates of N-alpha-Fmoc-amino acids/peptide acids and N-alpha-Boc-/Z-/ Bsmoc-amino acids catalyzed by DMAP leads to the incorporation of a reversed peptide bond. It was found to be a simple, efficient and clean reaction. All the retro-inverso peptides made were obtained as crystalline compounds in 70-92% yields. (c) 2006 Elsevier Ltd. All rights reserved.