Synthesis of 9-fluorenylmethoxycarbonyl-protected amino aldehydes
摘要:
9-Fluorenylmethoxycarbonyl-protected amino aldehydes could be efficiently prepared in good yields by using two methods: (i) NaBH4 reduction of Fmoc-protected mixed anhydrides, followed by the Swern oxidation of the alcohols; and (ii) LiAlH4 reduction of Fmoc-protected amino acid Weinreb amides. Both methods afforded comparable overall synthetic yields (70-80%). (C) 1998 Elsevier Science Ltd. All rights reserved.
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.
Primary alcohols and chiral N-protected 2-amino alcohols can be obtained in high yields from the reaction of pentafluorophenyl esters of the corresponding carboxylic acids with sodium borohydride in THF under mild conditions. This reductive method is rapid and compatible with various functional groups as well as with the most common N-protective groups Z, Boc and Fmoc.
Synthesis of Hybrid Peptidomimetics and Neoglycoconjugates Employing Click Protocol: Dual Utility of Poc-Group for Inserting Carbamate-Triazole Units into Peptide Backbone
作者:Hosahalli P. Hemantha、Ravi S. Lamani、Vommina V. Sureshbabu
DOI:10.1007/s10989-010-9228-6
日期:2010.12
Synthesis of new types of peptidomimetics and glycosylated amino acids possessing 1,2,3-triazole and carbamate moieties is described. Poc-protected amino acid esters/1-amino sugars were subjected to Cu(I) catalyzed [2+3]cycloaddition with desired azides under click protocol to obtain novel peptide and carbohydrate mimetics. The reaction is rapid, efficient and all the products are isolated in good yield and excellent purity.
Efficient Synthesis of <i>N</i>-Fmoc-Aminoalkoxy Pentafluorophenyl Carbonates: Application for the Synthesis of Oligopeptidyl Carbamates
作者:Vommina V. Sureshbabu、H. P. Hemantha
DOI:10.1080/00397910902790378
日期:2009.9.8
N-Fmoc--Aminoalkoxy pentafluorophenyl carbonates have been synthesized through the reaction of N-Fmoc--aminoalkoxy carbonyl chloride with pentafluorophenol. The reaction was clean and high yielding, and the products have been fully characterized using infrared, NMR, and mass spectroscopy. Their utility as efficient building blocks for the preparation of N-Fmoc-oligopeptidyl carbamate esters and acids has been demonstrated. The method exemplifies a simple protocol for the efficient preparation of oligopeptidyl carbamates in solution phase.
[EN] PEPTIDE NUCLEIC ACID (PNA) MONOMERS WITH AN ORTHOGONALLY PROTECTED ESTER MOIETY<br/>[FR] MONOMÈRES D'ACIDE NUCLÉIQUE PEPTIDIQUE (ANP) AVEC UNE FRACTION ESTER À PROTECTION ORTHOGONALE