Practical Synthesis of α-Amino Acid <i>N</i>-Carboxy Anhydrides of Polyhydroxylated α-Amino Acids from β-Lactam Frameworks. Model Studies toward the Synthesis of Directly Linked Peptidyl Nucleoside Antibiotics
作者:Claudio Palomo、Mikel Oiarbide、Aitor Esnal、Aitor Landa、José I. Miranda、Anthony Linden
DOI:10.1021/jo980354x
日期:1998.8.1
A straightforward method for the synthesis of polyhydroxylated alpha-amino acid N-carboxy anhydrides (NCAs) is described as the means by which short peptide segments comprised of a polyhydroxylated chain are easily affordable. The entire sequence lies in the preparation of nonracemic 3-hydroxy beta-lactams through the highly diastereoselective Staudinger reaction of hydroxyketene equivalents with chiral
描述了一种简单的合成多羟基化α-氨基酸N-羧基酸酐(NCA)的方法,这种方法可轻松负担得起由多羟基化链组成的短肽段。整个序列在于通过以下方法制备非外消旋的3-羟基β-内酰胺:羟基烯酮当量与手性α-氧化醛衍生的亚胺的高度非对映选择性的Staudinger反应,然后由TEMPO自由基辅助环扩展为相应的NCA,随后与α-偶联的肽偶联氨基酸酯。该方法已应用于合成从氨基甲酰基聚草酰胺酸,一些甘氨酸,以及C(2)对称羟基氨基酸衍生的短肽段。