Structurally diverse libraries of novel small molecules represent important sources of biologically active agents. In this paper we report the development of a diversity-oriented synthesis strategy for the generation of diverse small molecules based around a common macrocyclic peptidomimetic framework, containing structural motifs present in many naturally occurring bioactive compounds. Macrocyclic peptidomimetics are largely underrepresented in current small-molecule screening collections owing primarily to synthetic intractability; thus novel molecules based around these structures represent targets of significant interest, both from a biological and a synthetic perspective. In a proof-of-concept study, the synthesis of a library of 14 such compounds was achieved. Analysis of chemical space coverage confirmed that the compound structures indeed occupy underrepresented areas of chemistry in screening collections. Crucial to the success of this approach was the development of novel methodologies for the macrocyclic ring closure of chiral α-azido acids and for the synthesis of diketopiperazines using solid-supported
N
methylmorpholine. Owing to their robust and flexible natures, it is envisaged that both new methodologies will prove to be valuable in a wider synthetic context.
结构多样的新型小分子库代表了重要的生物活性物质来源。本文报告了一种以共同的大环肽类模拟框架为基础的多样化合成策略的开发,该框架包含许多天然存在的生物活性化合物中存在的结构基元。大环肽类模拟物在当前小分子筛选库中主要由于合成难度而大多数情况下被低估;因此,基于这些结构的新型分子代表了在生物学和合成角度上具有重要意义的目标。在一个概念验证研究中,成功合成了一个包含14种这类化合物的库。化学空间覆盖分析证实,这些化合物的结构确实占据了化学筛选库中未充分代表的领域。这种方法成功的关键在于开发了用于手性α-叠氮酸的大环闭合和使用固相支持的二酮二肽合成的新方法。由于它们的稳健和灵活性,预计这两种新方法在更广泛的合成背景下将被证明是有价值的。