Efficient Synthesis of Enantiopure Pyrrolizidinone Amino Acid
作者:Evelyne Dietrich、William D. Lubell
DOI:10.1021/jo034739d
日期:2003.9.1
Enantiopure (3S,5R,8S)-3-[N-(Boc)amino]-1-azabicyclo[3.3.0]octan-2-one 8-carboxylic acid (1) was synthesized in nine steps and 16% overall yield from aspartate beta-aldehyde 7. Carbene-catalyzed acyloin condensation of 7, followed by acetylation and samarium iodide reduction, gave linear precursor (2S,7S)-alpha,omega-diamino-4-oxosuberate 11, which was converted to N-(Boc)aminopyrrolizidin-2-one carboxylic
Rigid Dipeptide Mimics: Synthesis of Enantiopure C6-Functionalized Pyrrolizidinone Amino Acids
作者:Mallem H. V. Ramana Rao、Eulàlia Pinyol、William D. Lubell
DOI:10.1021/jo0616761
日期:2007.2.1
in a turn conformation. 6-Hydroxy pyrrolizidinone amino carboxylate 1 may thus find application as a constrained alaninylhydroxyproline dipeptidemimic. In addition, alkylation of the hydroxyl group provided orthogonally protected pyrrolizidinone amino dicarboxylate (6R)-25, demonstrating potential for expanding the diversity of these rigid dipeptide surrogates for the exploration of peptide conformation−activity