Stereoselective Organocatalyzed Synthesis of α-Fluorinated β-Amino Thioesters and Their Application in Peptide Synthesis
作者:Elena Cosimi、Oliver D. Engl、Jakub Saadi、Marc-Olivier Ebert、Helma Wennemers
DOI:10.1002/anie.201607146
日期:2016.10.10
β‐amino thioesters were obtained in high yields and stereoselectivities by organocatalyzed addition reactions of α‐fluorinated monothiomalonates (F‐MTMs) to N‐Cbz‐ and N‐Boc‐protected imines. The transformation requires catalyst loadings of only 1 mol % and proceeds under mild reaction conditions. The obtained addition products were readily used for coupling‐reagent‐free peptidesynthesis in solution
Selective amidation by a photocatalyzed umpolung reaction
作者:Debasish Ghosh、Rajesh Nandi、Saikat Khamarui、Sukla Ghosh、Dilip K. Maiti
DOI:10.1039/c9cc01079c
日期:——
Herein, a metal-catalyzed organic transformation merged with another organophotocatalyst has been developed under mild conditions for the production of α-ketoamides.
Design, synthesis and evaluation of novel 2-butyl-4-chloroimidazole derived peptidomimetics as Angiotensin Converting Enzyme (ACE) inhibitors
作者:Anvesh Jallapally、Dinesh Addla、Pankaj Bagul、Balasubramanian Sridhar、Sanjay K. Banerjee、Srinivas Kantevari
DOI:10.1016/j.bmc.2015.04.024
日期:2015.7
A series of novel 2-butyl-4-chloro-1-methylimidazole derived peptidomimetics were designed, synthesized and evaluated for their AngiotensinConvertingEnzyme (ACE) inhibitor activity. 2-Butyl-4-chloro-1-methylimidazole-5-carboxylic acid 2 obtained after oxidation of respective carboxaldehyde 1, was condensed with various amino acid methyl esters 3a–k to give imidazole–amino acid conjugates 4a–k in
and eco-friendly method for the synthesis of o-nitroarylamine from o-nitroaryl sulfonic acid via ipso nucleophilic aryl substitution by amine is described. The products have been obtained with good yields at room temperature without the assistance of any metal, activating agent, or toxic oxidant. This method is useful for racemization-free synthesis of N-aryl amino acid esters.