[EN] GAMMA AMINO ACID BUILDING BLOCKS<br/>[FR] ÉLÉMENTS CONSTITUTIFS DE GAMMA-AMINOACIDES
申请人:WISCONSIN ALUMNI RES FOUND
公开号:WO2011047190A1
公开(公告)日:2011-04-21
The invention provides compounds and methods, for example, to carry out organocatalytic Michael additions of aldehydes to cyclically constrained nitroethylene compounds catalyzed by a pro line derivative to provide cyclically constrained α-substituted-γ-nitro-aldehydes. The reaction can be rendered enantioselective when a chiral pyrrolidine catalyst is used, allowing for Michael adducts in nearly optically pure form (e.g., 96 to >99% e.e.). The Michael adducts can bear a single substituent or dual substituents adjacent to the carbonyl. The Michael adducts can be efficiently converted to cyclically constrained protected γ- amino acid residues, which are essential for systematic conformational studies of γ-peptide foldamers. New methods are also provided to prepare other γ-amino acids and peptides. These new building blocks can be used to prepare foldamers, such as α/γ-peptide foldamers, that adopt specific helical conformations in solution and in the solid state.
The invention provides compounds and methods, for example, to carry out organocatalytic Michael additions of aldehydes to cyclically constrained nitroethylene compounds catalyzed by a proline derivative to provide cyclically constrained α-substituted-γ-nitro-aldehydes. The reaction can be rendered enantioselective when a chiral pyrrolidine catalyst is used, allowing for Michael adducts in nearly optically pure form (e.g., 96 to >99% e.e.).
The Michael adducts can bear a single substituent or dual substituents adjacent to the carbonyl. The Michael adducts can be efficiently converted to cyclically constrained protected γ-amino acid residues, which are essential for systematic conformational studies of γ-peptide foldamers. New methods are also provided to prepare other γ-amino acids and peptides. These new building blocks can be used to prepare foldamers, such as α/γ-peptide foldamers, that adopt specific helical conformations in solution and in the solid state.
US9382291B2
申请人:——
公开号:US9382291B2
公开(公告)日:2016-07-05
US9796660B2
申请人:——
公开号:US9796660B2
公开(公告)日:2017-10-24
Characteristic Structural Parameters for the γ-Peptide 14-Helix: Importance of Subunit Preorganization
作者:Li Guo、Weicheng Zhang、Andrew G. Reidenbach、Michael W. Giuliano、Ilia A. Guzei、Lara C. Spencer、Samuel H. Gellman
DOI:10.1002/anie.201101301
日期:2011.6.20
All wound up: Crystallographic data for a set of homologous peptides constructed from gabapentin and two to six preorganized γ‐amino acid residues (see crystal structure of the longest peptide) allow derivation of characteristicparameters for the γ‐peptide 14‐helix and establish guidelines for characterizing 14‐helical folding. The results suggest that the substitution pattern of a γ‐residue has a