RADICAL REACTIONS FOR NATURAL PRODUCTS

描述：（申请人摘要）新合成方法的开发 以及合成候选药物和其他有机分子的反应， 在健康相关研究中的重要性是一个非常重要的持续目标。 在下一个授权期内，级联自由基反应将在两个 不同的方向：1）固相自由基反应将与 目的是合成中等大小（100-200）的抗肿瘤和 抗病毒剂，和2）新的自由基级联序列将研究与 本发明的目的是由以下步骤一步制备复杂的三环和四环环体系： 无环前体具体目标是： 1)目的建立一种高效实用的马匹辛固相合成方法 基于我们目前的溶液相级联自由基的生物碱家族 异腈的环化。 2)开发一种新的邻卤苄基连接剂，用于将醇连接到固体上 相，并从该连接体释放底物以提供定量的 关于固相上自由基竞争动力学的信息。 3)为了合成100-200个单独的马匹辛纯类似物的文库， 使用目的2和3中获得的知识制备马匹辛酮抗病毒剂。 4)在溶液（20元）和固相（100元）中合成 抗肿瘤剂喜树碱的E环扩增类似物的文库。这些 将测定化合物的内酯稳定性和它们的杀伤能力 癌细胞 5)目的：开发三环天然产物裸米烯的短合成方法 从容易获得的无环前体开始， 在“往返”激进类中的环化。 6)为了完成一系列合格的模型研究， 往返自由基环化的方法，其中一个crinipellin类， 抗菌剂 7)为了完成一个简洁的全合成的crinipellins之一， 对映体纯的形式，通过使用往返自由基反应， 完整的碳骨架和所有四个环在一个单一的步骤，从一个容易 可用的无环前体。

DESCRIPTION: (Applicant's Abstract) The development of new synthetic methods and reactions to synthesize drug candidates and other organic molecules of importance in health-related research is a continuing goal of great importance. In the next granting period, cascade radical reactions will be developed in two different directions: 1) solid phase radical reactions will be developed with the aim of synthesizing moderate sized (100-200) libraries of antitumor and antiviral agents, and 2) new radical cascade sequences will be studied with the aim of preparing complex tri- and tetracyclic ring systems in one step from acyclic precursors. The specific aims are: 1) To develop an efficient and practical solid phase synthesis of the mappicine family of alkaloids based on our current solution phase cascade radical annulation of isonitriles. 2) To develop a new o-halobenzyl linker for attaching alcohols to the solid phase, and to release substrates from this linker to provide quantitative information about radical competition kinetics on the solid phase. 3) To synthesize a library of 100-200 individual pure analogs of mappicine and mappicine ketone antiviral agents using the knowledge gained in Aims 2 and 3. 4) To synthesize in solution (20 member) and on the solid phase (100 member) libraries of E-ring expanded analogs of the antitumor agent camptothecin. These compounds will be assayed for their lactone stability and their ability to kill cancer cells. 5) To develop a short synthesis of the tricyclic natural product gymnomitrene starting from a readily available acyclic precursor through a triple cyclization in the "round trip" radical class. 6) To complete sequence of competent model studies that will light the way to a round trip radical cyclization approach to one of the crinipellin class of antibacterial agents. 7) To complete a concise total synthesis of one of the crinipellins in enantiomerically pure form by using a round trip radical reaction that forms the complete carbon skeleton and all four rings in a single step from a readily available acyclic precursor.