Direct Organocatalytic Asymmetric Aldol Reactions of α-Amino Aldehydes: Expedient Syntheses of Highly Enantiomerically Enriched anti-β-Hydroxy-α-amino Acids
摘要:
A simple and efficient method for the synthesis of highly enantiomerically enriched beta-hydroxy-alpha-amino acid derivatives has been developed. Direct asymmetric aldol reactions of a glycine aldehyde (aminoacetaldehyde) derivative have been performed under organocatalysis using L-proline or (5)-5-pyrrolidine-2-yl-1H-tetrazole. The reactions afforded anti-beta-hydroxy-alpha-amino aldehydes in good yield with high diastereoselectivity (dr up to >100:1) and high enantioselectivity (up to >99.5% ee), which were easily transformed into beta-hydroxy-alpha-amino acid derivatives.
Conformationally constrained peptide mimetics in which a hydrogen bond interaction is replaced with a covalent hydrogen bond mimic are provided. Also provided are various methods of making these peptide mimetics.
[EN] REACTIONS OF ENOLIZABLE A-AMINO ALDEHYDES OR KETONES TO FORM AMINE<br/>[FR] REACTIONS ASYMETRIQUES ORGANOCATALYTIQUES DIRECTES D'ALPHA-AMINO-ALDEHYDES OU -CETONES ENOLISABLES EN VUE DE LA FORMATION DE PRODUITS AMINES ENANTIOMERIQUEMENT ENRICHIS
申请人:SCRIPPS RESEARCH INST
公开号:WO2006023720A3
公开(公告)日:2007-01-11
US8563686B2
申请人:——
公开号:US8563686B2
公开(公告)日:2013-10-22
Direct Organocatalytic Asymmetric Aldol Reactions of α-Amino Aldehydes: Expedient Syntheses of Highly Enantiomerically Enriched <i>a</i><i>nti</i>-β-Hydroxy-α-amino Acids
作者:Rajeswari Thayumanavan、Fujie Tanaka、Carlos F. Barbas
DOI:10.1021/ol0485417
日期:2004.9.1
A simple and efficient method for the synthesis of highly enantiomerically enriched beta-hydroxy-alpha-amino acid derivatives has been developed. Direct asymmetric aldol reactions of a glycine aldehyde (aminoacetaldehyde) derivative have been performed under organocatalysis using L-proline or (5)-5-pyrrolidine-2-yl-1H-tetrazole. The reactions afforded anti-beta-hydroxy-alpha-amino aldehydes in good yield with high diastereoselectivity (dr up to >100:1) and high enantioselectivity (up to >99.5% ee), which were easily transformed into beta-hydroxy-alpha-amino acid derivatives.