Transformations of <i>β</i>-aryl-<i>N</i>-Cbz-<i>α</i>,<i>β</i>-didehydro-<i>α</i>-amino esters with hydrazine hydrate
作者:Miha Drev、Uroš Grošelj、Jurij Svete
DOI:10.1515/znb-2015-0221
日期:2016.6.1
β-didehydro-β-arylalanine esters 1 with excess hydrazine hydrate afforded mixtures of the expected 3-pyrazolidinones 2 and the unexpected 1-amino-5-benzylidenehydantoins 6 and N-Cbz-β-arylalanine hydrazides 7. Presumably, the pyrazolidinones 2 and hydantoins 6 are formed as primary products via competitive 1,2- and 1,4-addition of hydrazine hydrate followed by cyclization, whereas β-arylalanine hydrazides 7 are formed
Synthesis of pyrazolo[1,2-a]pyrazole-based peptide mimetics
作者:Ana Novak、Ana Testen、Jure Bezenšek、Uroš Grošelj、Martina Hrast、Marta Kasunič、Stanislav Gobec、Branko Stanovnik、Jurij Svete
DOI:10.1016/j.tet.2013.05.122
日期:2013.8
The synthesis of U-shaped conformationally constrained analogues of peptides based on the 3-amino-2oxo-1,5-diazabicyclo[3.3.0]octane-8-carboxylic acid scaffold was developed. [3+2] Cycloadditions of (1Z,4R*,5R*)-1-arylmethylidene-4-benzyloxycarbonylamino-3-oxo-5-phenylpyrazolidin-1-ium-2-ides to tert-butyl acrylate and tert-butyl methacrylate gave the corresponding racemic cycloadducts, in most cases as mixtures of isomers, which were separated by preparative chromatography. Selective deprotection of the C- and the N-terminal of these heterocyclic dipeptides followed by coupling with (S)-alanine derivatives and chromatographic separation furnished the non-racemic tripeptides as target compounds. The structures of racemic cycloadducts and non-racemic final products were determined by NMR spectroscopy and X-ray diffraction. The synthesized compounds were also evaluated for inhibition of MurD ligase and D-alanine:D-alanine ligase. (C) 2013 Elsevier Ltd. All rights reserved.
Anthranilimide-based glycogen phosphorylase inhibitors for the treatment of Type 2 diabetes: 2. Optimization of serine and threonine ether amino acid residues
作者:Steven M. Sparks、Pierette Banker、David M. Bickett、Daphne C. Clancy、Scott H. Dickerson、Dulce M. Garrido、Pamela L. Golden、Andrew J. Peat、Lauren R. Sheckler、Francis X. Tavares、Stephen A. Thomson、James E. Weiel
DOI:10.1016/j.bmcl.2008.11.084
日期:2009.2
Optimization of the amino acid residue of a series of anthranilimide-based glycogen phosphorylase inhibitors is described leading to the identification of serine and threonine ether analogs. t-Butylthreonine analog 20 displayed potent in vitro inhibition of GPa, low potential for P450 inhibition, and excellent pharmacokinetic properties. (C) 2008 Elsevier Ltd. All rights reserved.