Solid-Phase Synthesis of Oligourea Peptidomimetics Employing the Fmoc Protection Strategy
摘要:
A solid-phase-Fmoc-based-synthesis strategy is described for oligourea peptidomimetics as well as a convenient general synthesis approach for the preparation of the required building blocks 5a-j and 5k. These are suitable for use in peptide or robot synthesizers, which is illustrated by the synthesis of oligourea peptidomimetics of part of Leu-enkephalin (10) and a neurotensin derivative (17).
Solid-Phase Synthesis of Oligourea Peptidomimetics Employing the Fmoc Protection Strategy
摘要:
A solid-phase-Fmoc-based-synthesis strategy is described for oligourea peptidomimetics as well as a convenient general synthesis approach for the preparation of the required building blocks 5a-j and 5k. These are suitable for use in peptide or robot synthesizers, which is illustrated by the synthesis of oligourea peptidomimetics of part of Leu-enkephalin (10) and a neurotensin derivative (17).
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.
Efficient loading of primary alcohols onto a solid phase using a trityl bromide linker
作者:François Crestey、Lars K. Ottesen、Jerzy W. Jaroszewski、Henrik Franzyk
DOI:10.1016/j.tetlet.2008.07.130
日期:2008.10
The Letter describes an improved, rapid and mild strategy for the loading of primary alcohols onto a polystyrene trityl resin via a highly reactive trityl bromide linker. This protocol facilitates an efficient resin loading even of acid-sensitive or heat-labile alcohols, which otherwise require expensive or non-commercial resin types. Secondary alcohols were only attached in moderate to low yields, while attempts to load a tertiary alcohol expectedly failed. Importantly, selective attachment of diols via a primary alcohol group in the presence of more hindered alcohol groups proved possible. The effects of activation time and reagent excess as well as alcohol structure were investigated. This improved method provides a convenient access to O-linked resin-bound N-Fmoc-protected amino alcohols that may be employed in SPS of peptides with C-terminal alcohol functionalities. In the case of a sensitive alcohol containing an activated aziridine functionality, the use of the trityl bromide linker proved superior to a recently described silver triflate-assisted trityl chloride resin-based Procedure. (C) 2008 Elsevier Ltd. All rights reserved.
Oxidizing Polymers: A Polymer-Supported, Recyclable Hypervalent Iodine(V) Reagent for the Efficient Conversion of Alcohols, Carbonyl Compounds, and Unsaturated Carbamates in Solution J.R. gratefully acknowledges generous support from Prof. M. E. Maier, Tübingen, the Strukturfonds of the University of Tübingen, the Fonds der Chemischen Industrie, and the DFG. We thank Graeme Nicholson, Dietmar Schmid, and Daniel Bischoff for analytical support.