Biphalin [(Tyr‐D‐Ala‐Gly‐Phe‐NH‐)2] is an octapeptide with mixed μ/δ opioid activity. Itsstructure is based on two identical enkephalin‐like portions linked “tail‐to‐tail” by a hydrazine bridge. This study presents the synthesis and in vitro and in vivo bioassays of two biphalin analogs that do not present the toxicity connected with the presence of the hydrazine moiety and are able to elicit a higher
Catalysis by Amino Acid-Derived Tetracoordinate Complexes: Enantioselective Addition of Dialkylzincs to Aliphatic and Aromatic Aldehydes
作者:Brian D. Dangel、Robin Polt
DOI:10.1021/ol0063151
日期:2000.9.1
Me(2)Zn and Et(2)Zn added to aromatic and aliphatic aldehydes in the presence of 3 mol % of 2. (S)-1-Phenylethanol (91% ee) and (S)-1-phenylpropanol (86% ee) were synthesized from benzaldehyde and (S)-1-furan-2-yl-1-propanol (86% ee) from 2-furaldehyde. Nonanal and 3-phenylpropanal provided (S)-3-undecanol (96% ee) and (S)-1-phenyl-3-pentanol (94% ee). A solid-phase variant was effective with reduced
Novel chiral Schiff base ligands from amino acid amides and salicylaldehyde
作者:Massimo Curini、Francesco Epifano、Federica Maltese、Maria C. Marcotullio
DOI:10.1016/s0040-4039(02)00687-1
日期:2002.5
A novel type of symmetric chiral Schiff base ligands has been synthesized in good yield Using an easy and good fielding stepwise approach front alpha-phenylenediamine, amino acids and salicylaldehyde. (C) 2002 Elsevier Science Ltd. All rights reserved.
Amino Acid-Derived Ligands for Transition Metals: Catalysis via a Minimalist Interpretation of a Metalloprotein
Synthesis and biological evaluation of new biphalin analogues with non-hydrazine linkers
作者:Adriano Mollica、Peg Davis、Shou-Wu Ma、Josephine Lai、Frank Porreca、Victor J. Hruby
DOI:10.1016/j.bmcl.2005.03.067
日期:2005.5
Biphalin is a potent opioid peptide agonist, with a palandromic structure, composed of two enkephalin-like active fragments connected tail to tail by a hydrazine linker (Tyr-D-Ala-Gly-Phe-NH-NH <-Phe <-Gly <-D-Ala <-Tyr). This study presents the synthesis and in vitro bioassays of six new biphalin analogues with three different non-hydrazine linkers, some of which have higher binding affinity and bioactivity than biphalin. (c) 2005 Elsevier Ltd. All rights reserved.