Chirospecific Synthesis of Spirocyclic β-Lactams and Their Characterization as Potent Type II β-Turn Inducing Peptide Mimetics
作者:Holger Bittermann、Peter Gmeiner
DOI:10.1021/jo0517287
日期:2006.1.1
Starting from natural proline, a practical chirospecific synthesis of spirocyclic β-lactams of type 2 is described when a methylene moiety showing minimal steric demand is employed as a constraint element for adjusting the dihedral angle Ψ(i + 1). Employing the concept of self-reproduction of chirality, C-formylation of the oxazolidinone 5 afforded the key intermediate 7 taking advantage of an intermediate
从天然脯氨酸开始,描述了当将显示最小空间需求的亚甲基部分用作调节二面角θ(i + 1)的限制元素时,实际的2型螺环β-内酰胺的手性特异性合成。利用手性的自我复制的概念,恶唑烷酮5的C-甲酰化利用桥接元素作为乙烯基部分的中间保护而提供了关键中间体7。基于NMR和IR的构象研究清楚地表明,2型螺-β-内酰胺类可以作为有效的β-turn成核剂。