Practical Synthesis of Enantiomerically Pure β<sup>2</sup>-Amino Acids via Proline-Catalyzed Diastereoselective Aminomethylation of Aldehydes
作者:Yonggui Chi、Emily P. English、William C. Pomerantz、W. Seth Horne、Leo A. Joyce、Lane R. Alexander、William S. Fleming、Elizabeth A. Hopkins、Samuel H. Gellman
DOI:10.1021/ja070063i
日期:2007.5.1
efficiently transformed to protected beta2-amino acids, which are valuable building blocks for beta-peptides, natural products, and other interesting molecules. Because conditions for the aminomethylation and subsequent reactions are mild, beta2-amino acid derivatives with protected functional groups in the side chain, such as beta2-homoglutamic acid, beta2-homotyrosine, and beta2-homolysine, can be
CONCISE BETA2-AMINO ACID SYNTHESIS VIA ORGANOCATALYTIC AMINOMETHYLATION
申请人:CHI Yonggui
公开号:US20080058548A1
公开(公告)日:2008-03-06
The present invention provides a method for the synthesis of β
2
-amino acids. The method also provides methods yielding α-substituted β-amino aldehydes and β-substituted γ-amino alcohols. The present method according to this invention allows for increased yield and easier purification using minimal chromatography or crystallization. The methods described herein are based on an aldehyde aminomethylation which involves a Mannich reaction between an aldehyde and a formaldehyde-derived N,O-acetal (iminium precursor) and a catalyst, such as, for example, L-proline or a pyrrolidine. The invention allows for large scale, commercial preparation of β
2
-amino acids.