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Journals and Conferences
A new lupane type triterpenic acid, pulsatillic acid, and two new lupane type triterpenoid glycosides, pulsatilloside A and B, along with the known 23-hydroxybetulinic acid were isolated from the roots of Pulsatilla chinensis. Their structures were characterized as 3-oxo-23-hydroxy-lup-20(29)-en-28-oic acid, 3 beta, 23-dihydroxy-lup-20(29)-en-28-oic acid… (More)
A series of novel synthetic dipeptides, containing a C-terminal glyoxal grouping (-COCHO), have been tested as inhibitors against typical members of the serine- and cysteine-proteinase families. For example, the sequences benzyloxycarbonyl (Cbz)-Pro-Phe-CHO (I) and Cbz-Phe-Ala-CHO (II), which fulfil the known primary and secondary specificity requirements… (More)
A series of peptidyl alpha-keto aldehydes (glyoxals) have been synthesised as putative inhibitors of the chymotryptic-like activity of proteasome. The most potent peptides, Cbz-Leu-Leu-Tyr-COCHO and Bz-Leu-Leu-Leu-COCHO, function as slow-binding reversible inhibitors, exhibiting final Ki values of approximately 3.0 nM. These are among the lowest values so… (More)
Patensin, a new triterpenoid glycoside, was isolated from the ethanolic extraction of the roots of Pulsatilla patens var. multifida. Its structure was established as hederagenin 3-O-beta-D-galactopyranosyl-(1-->2)-beta-D- glucopyranoside on the basis of hydrolysis and spectral evidence including 1D and 2D NMR techniques.
The use of a leucine-derived alpha-keto-beta-aldehyde (glyoxal) as a substrate in the Horner-Emmons (Wadsworth) Wittig reaction has enabled the synthesis of (Z)-7-methyl-5(S)-amino-4-oxo-methyl-oct-2-eneoate. This novel compound is a potent inhibitor (Ki = 76 nM) of leucine aminopeptidase and provides an interesting new template for the development of… (More)
Alan Ford,† Hugues Miel, Aoife Ring,† Catherine N. Slattery,† Anita R. Maguire,*,†,‡ and M. Anthony McKervey* †Department of Chemistry and ‡School of Pharmacy, Analytical and Biological Chemistry Research Facility, Synthesis and Solid State Pharmaceutical Centre, University College Cork, Cork, Ireland Almac Discovery Ltd., David Keir Building, Stranmillis… (More)
Four lipophilic sulphur and/or nitrogen containing calixarene derivatives have been tested as ionophores in Ag(I)-selective poly (vinyl chloride) membrane electrodes. All gave acceptable linear responses with one giving a response of 50 mV/dec in the Ag(I) ion activity range 10(-4)-10(-1)M and high selectivity towards other transition metals and sodium and… (More)
The complexing ability of a range of 19 symmetrical, unsymmetrical and bridged calixarene derivatives having ester, ketone, amide, amine and thioether functionalities were determined by the picrate extraction method. On incorporating these calixarene derivatives as neutral carrier ionophores in sodium-selective poly (vinyl chloride) membrane… (More)
The synthesis of a propranolol amide derivative of p-allylcalixarene is described, which has been designed to behave as a molecular sensor capable of distinguishing chiral amines on the basis of their shape and chirality. This molecule can discriminate between the enantiomers of phenylalaninol through the quenching of the fluorescence emission in… (More)
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.