Expedient solid-phase synthesis of putative β-turn mimetics incorporating the i + 1, i + 2, and i + 3 sidechains
作者:Alex A. Virgilio、Stephan C. Schürer、Jonathan A. Ellman
DOI:10.1016/0040-4039(96)01572-9
日期:1996.9
number of putative β-turnmimetics that incorporate sidechain functionality at the i + 1, i + 2, and i + 3positions were synthesized on solid support in high levels of purity and in good overall yields from readily available starting materials. A variety of sidechain functionality, ring sizes, and sidechain stereochemistries were introduced demonstrating the generality of the synthesis method. A significant
Identification of a Potent Heterocyclic Ligand To Somatostatin Receptor Subtype 5 by the Synthesis and Screening of β-Turn Mimetic Libraries
作者:Andrew J. Souers、Alex A. Virgilio、Åsa Rosenquist、Wasyl Fenuik、Jonathan A. Ellman
DOI:10.1021/ja983742p
日期:1999.3.1
Methods for the parallelsynthesis of medium-ring heterocyclic β-turn mimetics (1) are described, which enable the rapid preparation of libraries of mimetics for the identification of small molecule ligands to receptors. The generality of this method was first demonstrated by the rapid and high-yielding synthesis of mimetics 1a−g that display a wide range of proteinogenic amino acid side chains. Small
Direct synthesis of α-thio aromatic acids from aromatic amino acids
作者:Eric R. Samuels、Irina F. Sevrioukova
DOI:10.1016/j.tetlet.2018.02.030
日期:2018.3
Modified aminoacids are useful synthetic components in both chemistry and biology. Here we describe a simple, scalable two-step procedure to generate α-thio aromatic acidsfrom aromatic aminoacids with yields of up to 96%. Diazotization and α-lactone mediated bromination efficiently form the α-bromo acid with retention of configuration. Thiol substitution with mild reagents such as sodium hydrosulfide
Efficient Synthesis of β<sup>2</sup>-Amino Acid by Homologation of α-Amino Acids Involving the Reformatsky Reaction and Mannich-Type Imminium Electrophile
作者:Roba Moumne、Solange Lavielle、Philippe Karoyan
DOI:10.1021/jo060316a
日期:2006.4.1
Development of new methods for the synthesis of β-amino acids is important as polymers of these compounds are promising peptidomimetic candidates in medicinal chemistry. We report here our findings on a new and highly efficient general strategy for the synthesis of β2-amino acids by homologation of α-amino acids, involving the Reformatsky reaction and Mannich-type imminium electrophile.