Solid phase synthesis of N-carboxy alkyl-containing peptides derived from enantiopure αketo-β-aminoacids
作者:Concepción Fermández-García、Kai Prager、M Anthony McKervey、Brian Walker、Carvell H Williams
DOI:10.1016/s0960-894x(98)00054-7
日期:1998.3
alpha-Keto-beta-aminoacids 5a-c can be reductively aminated with the peptide sequence H2N-Leu-Val-Phe-Phe on a solid support to afford N-carboxy alkyl peptides 1a-c. The N-carboxy alkyl lysine derivative 7 was subsequently extended from the N-terminus with glutamine and histidine residues.
The structure-activity relationship of a series of styrylpyridine analogs of MK-0476 (montelukast, Singulair(R)) is described. This work has led to the identification of a number of potent and orally active cysLT(1), receptor (LTD4 receptor) antagonists including 2ab (1,-733,321) as an optimized candidate. (C) 1998 Elsevier Science Ltd. All rights reserved.
Facile Preparation of an Orthogonally Protected, pH-Sensitive, Bioconjugate Linker for Therapeutic Applications
作者:Steven Fletcher、Michael R. Jorgensen、Andrew D. Miller
DOI:10.1021/ol0483347
日期:2004.11.1
We describe the facile, three-step synthesis of an orthogonally protected, pH-sensitive linker (8), based on maleic acid, and report its application to the preparation of a pH-sensitive phospholipid (20) for potential use in drug and gene delivery. In addition, we highlight the benefits of our linker over the use of the commercially available cis-aconitic anhydride (4).
α,β-Diketo nitriles as dielectrophiles. Formation of heterocyclic derivatives of amino acids
作者:Harry H Wasserman、Yun Oliver Long、Jonathan Parr
DOI:10.1016/s0040-4039(02)02486-3
日期:2003.1
The reactions of mono Boc-protected amino monocarboxylic acids with phosphoranylideneacetonitrile yield ylido nitriles which on ozonolysis at low temperature form labile alpha,beta-diketo nitriles. These derivatives may be used in Situ for reaction with diamines or related dinucleophiles to yield hetero derivatives of interest as unnatural amino acid building blocks. (C) 2002 Elsevier Science Ltd. All rights reserved.
A Novel Methodology for the Synthesis of Fumarates and Maleates
The stereoselectivity of both the Wittig and the Homer-Wadsworth-Emmons reactions allows for the synthesis of orthogonally protected fumarates and maleates, respectively, from α-keto esters. This methodology has been shown to be useful in the synthesis of a derivative of the pH sensitive cis-aconitic linker, important for prodrug approaches in drug delivery. We have incorporated this linker into a