189337-28-8Relevant articles and documents
Urea based foldamers
Yoo, Sung Hyun,Li, Bo,Dolain, Christel,Pasco, Morgane,Guichard, Gilles
, p. 59 - 92 (2021/06/25)
N,N′-linked oligoureas are a class of enantiopure, sequence-defined peptidomimetic oligomers without amino acids that form well-defined and predictable helical structures akin to the peptide α-helix. Oligourea-based foldamers combine a number of features—such as synthetic accessibility, sequence modularity, and folding fidelity—that bode well for their use in a range of applications from medicinal chemistry to catalysis. Moreover, it was recently recognized that this synthetic helical backbone can be combined with regular peptides to generate helically folded peptide-oligourea hybrids that display additional features in terms of helix mimicry and protein-surface recognition properties. Here we provide detailed protocols for the preparation of requested monomers and for the synthesis and purification of homo-oligoureas and peptide-oligourea hybrids.
Staudinger/aza-Wittig reaction to access Nβ-protected amino alkyl isothiocyanates
Santhosh,Durgamma,Shekharappa,Sureshbabu, Vommina V.
, p. 4874 - 4880 (2018/07/15)
A unified approach to access Nβ-protected amino alkyl isothiocyanates using Nβ-protected amino alkyl azides through a general strategy of Staudinger/aza-Wittig reaction is described. The type of protocol used to access isothiocyanates depends on the availability of precursors and also, especially in the amino acid chemistry, on the behavior of other labile groups towards the reagents used in the protocols; fortunately, we were not concerned about both these factors as precursor-azides were prepared easily by standard protocols, and the present protocol can pave the way for accessing title compounds without affecting Boc, Cbz and Fmoc protecting groups, and benzyl and tertiary butyl groups in the side chains. The present strategy eliminates the need for the use of amines to obtain title compounds and thus, this method is step-economical; additional advantages include retention of chirality, convenient handling and easy purification. A few hitherto unreported compounds were also prepared, and all final compounds were completely characterized by IR, mass, optical rotation, and 1H and 13C NMR studies.
Synthesis of peptide alcohols on the basis of an O-N acyl-transfer reaction
Tailhades, Julien,Gidel, Marie-Aude,Grossi, Benjamin,Lecaillon, Jennifer,Brunel, Luc,Subra, Gilles,Martinez, Jean,Amblard, Muriel
supporting information; experimental part, p. 117 - 120 (2010/04/04)
(Figure Presented) Getting the better of troublemakers: C-terminal peptide alcohols cannot be synthesized by conventional solidphase peptide synthesis (SPPS) because of the absence of a free carboxylic group to attach to the resin. This problem was circumvented by anchoring a β-amino alcohol residue to the resin to provide a starting point for SPPS. An intramolecular O-N acyl shift completed the synthesis of the desired peptides (see scheme).
