From Cyclic Peptoids to Peraza-macrocycles: A General Reductive Approach
摘要:
Peraza-macrocycles form chelates of high thermodynamic and kinetic stability useful in diagnostic imaging (MRI, SPECT, PET), in coordination chemistry, and as catalysts. In this letter, we report an advantageous method to prepare these compounds via BH3-induced reduction of cyclic peptoids. Using this procedure, 10 homo- and heterosubstituted aza-coronands, with different sizes and side chains, have been synthesized from the corresponding cyclic oligoamides. Solid structures of free, protonated, and Na+ coordinated polyaza-derivatives have been disclosed by single crystal X-ray diffraction analysis.
Conformational isomerism in cyclic peptoids and its specification
作者:A. D'Amato、R. Schettini、G. Della Sala、C. Costabile、C. Tedesco、I. Izzo、F. De Riccardis
DOI:10.1039/c7ob02643a
日期:——
local analysis of ω, ψ, χ, φ dihedral angles). However, little intuitive understanding is available from internal coordinates when stereochemistry is involved. In this contribution we list all the conformationally stable cyclic peptoids reported up to the year 2017 and propose a simple method to define their geometric arrangement in terms of planar chirality. Evidence of conformationalisomerism (due
作者:Adrian S. Culf、Miroslava Čuperlović-Culf、Daniel A. Léger、Andreas Decken
DOI:10.1021/ol501102b
日期:2014.5.16
A convenient and efficient methodology for the head-to-tail macrocyclization of small 3-mer, 4-mer, and 5-mer α-peptoid acids (9-, 12-, and 15-atom N-substituted glycine oligomers) is described. The cyclic trimer has a ccc amide sequence in the crystal structure, whereas the tetramer has ctct and the pentamer has ttccc stereochemistry. NMR analysis reveals rigid structures in solution. These synthetic