A series of oligomers of the type Boc‐(L‐Phe‐D‐Oxd)n‐OBn (Boc=tert‐butoxycarbonyl; Oxd=4‐methyl‐5‐carboxy oxazolidin‐2‐one; Bn=benzyl) were prepared for n=2–5. The shortest oligomer, Boc‐(L‐Phe‐D‐Oxd)2‐OBn, aggregates and forms a fiber‐like material with an anti‐parallel β‐sheet structure in which the oligopeptide units are connected to each other by only one intermolecular hydrogen bond. The longer
制备了一系列 Boc-( L -Phe- D - Oxd ) n- OBn (Boc= tert -butoxycarbonyl; Oxd=4-methyl-5-carboxy oxazolidin-2-one; Bn=benzyl) 类型的低聚物用于n =2-5。最短的低聚物,Boc-( L -Phe- D - Oxd ) 2-OBn,聚集并形成具有反平行β-折叠结构的纤维状材料,其中寡肽单元仅通过一个分子间氢键相互连接。较长的低聚物表现出结构异质性。它们通过在五聚体
水平上形成分子内氢键开始组织成二级结构。低聚物的显微镜和衍射表明只有较短的低聚物具有结晶特征。