[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.
该发明提供了化合物和方法,例如,用于催化贝氏碱衍生物对环状约束硝基乙烯化合物进行醛的有机催化Michael加成,从而提供环状约束的α-取代-γ-硝基醛。当使用手性吡咯烷催化剂时,反应可以实现对映选择性,从而以几乎光学纯形式(例如,96%至>99% e.e.)获得Michael加合物。Michael加合物可以在羰基相邻处携带单取代基或双取代基。Michael加合物可以高效转化为环状约束的保护γ-氨基酸残基,这对于γ-肽折叠体系的系统构象研究至关重要。还提供了制备其他γ-氨基酸和肽的新方法。这些新的构建模块可用于制备折叠体,例如α/γ-肽折叠体,在溶液中和固态中采用特定螺旋构象。