2-Chloro-4,6-dimethoxy-1,3,5-triazine. A New Coupling Reagent for Peptide Synthesis
作者:Zbigniew J. Kamiński
DOI:10.1055/s-1987-28122
日期:——
In order to facilitate the purification of peptides, the new coupling reagent 2-chloro-4,6-dimethoxy-1,3,5-triazine (CDMT) is proposed. Due to the weakly basic properties of the triazine ring, the side products and excess coupling reagent are easily removed by washing the crude reaction product with diluted acids. CDMT enables the synthesis of di-,tri-, and pentapeptides in 75-98% yield under mild conditions and without concomitant racemization. Moreover, the reagent diminishes the formation of side products during the incorporation of serine with an unprotected hydroxy group or of N-protected Ï-nitroarginine into the peptide chain.
Synthesis of Enkephalin analogs via asymmetric hydrogenation of dehydropeptide building blocks
作者:Iwao Ojima、Noriko Yoda、Momoko Yatabe
DOI:10.1016/s0040-4039(00)87742-4
日期:——
and [Ac-Tyr1, D-Ala2, Leu5-OMe]Enkephalin were successfully synthesized by the coupling of dipeptide units and tripeptide units which were readily obtained by the asymmetric hydrogenation of the corresponding dehydropeptide buildingblocks.
Synthesis and Opioid Activity of Tyr<sup>1</sup>-<i>ψ</i>[(<i>Z</i>)CF=CH]-Gly<sup>2</sup>and Tyr<sup>1</sup>-<i>ψ</i>[(<i>S</i>)/(<i>R</i>)-CF<sub>3</sub>CH-NH]-Gly<sup>2</sup>Leu-enkephalin Fluorinated Peptidomimetics
作者:Somnath Narayan Karad、Mohan Pal、Rachel S. Crowley、Thomas E. Prisinzano、Ryan A. Altman
DOI:10.1002/cmdc.201700103
日期:2017.4.20
We describe the design, synthesis, and opioid activity of fluoroalkene (Tyr1 -ψ[(Z)CF=CH]-Gly2 ) and trifluoroethylamine (Tyr1 -ψ[(S)/(R)-CF3 CH-NH]-Gly2 ) analogues of the endogenous opioid neuropeptide, Leu-enkephalin. The fluoroalkene peptidomimetic exhibited low nanomolar functional activity (5.0±2 nm and 60±15 nm for δ- and μ-opioid receptors, respectively) with a μ/δ-selectivity ratio that mimics