NATURAL PRODUCT SYNTHESES

该项目将产生新的有机合成方法， 对生物活性天然产物的合成方法进行了充分的试验， 产品和类似物。 主题是激活和引导效果 过渡金属。 新方法学的发展及其应用 复杂结构的形成仍然是一个强大的 开发新药的方法。 过渡金属提供了 进行精细和选择性碳-碳偶联的机会 反应，适用于立体限定和高度官能化的 目标的 有机过渡金属化学的两个方面将得到发展。 金属配位的乙烯基卡宾的重排是一个主题， 开始于卡宾-金属与炔反应，得到醌 衍生物，并导致有趣的催化重排， 环丙烯转化为更一般的芳香族结构系列。 直接 乙烯基卡宾与金属的相互作用将通过相同的途径 一般芳香族化合物，并可能提供直接证据， 涉及多步途径。 在第二个领域，将使用钯 促进杂环的形成，伴随偶联 用CO和其它碳单元作为扩链步骤。 具体 在四环霉素全合成中的应用， 提出了其他抗生素的合成方法。 一名代表 将构建与天然抗肿瘤药物相关的蒽醌类化合物 使用乙烯基卡宾/金属技术。 此外，最后阶段 一种有效的蛋白质和核酸抑制剂， 合成，将完成与有机镍的应用 中间体的

This project will generate new methods of organic synthesis and fully test the methods in the synthesis of biologically active natural products and analogs. The theme is the activating and directing effects of transition metals. The development of new methodology and application in formation of complex structures continues to be part of a powerful approach to the development of new drugs. Transition metals offer the opportunity to carry out delicate and selective carbon-carbon coupling reactions, appropriate for the stereo-defined and highly functionalized targets. Two aspects of organo-transition metal chemistry will be developed. Rearrangements of metal-coordinated vinyl-carbenes is a theme which begins with carbene-metal reactions with alkynes to give quinone derivatives and leads to intriguing catalytic rearrangements of cyclopropenes into more general series of aromatic structures. Direct interaction of vinyl carbenes with metals will lead via the same pathways to general aromatic compounds, and may give direct evidence for the multi-step pathway involved. In the second area, palladium will be used to promote the formation of heterocyclic rings, with concomitant coupling with CO and other carbon units as chain extension steps. Specific application in the total synthesis of tetronomycin as well as partial synthesis of other antibiotics are proposed. A representative anthraquinone related to the natural antitumor agents will be constructed using the vinyl-carbene/metal technology. In addition, the final stages of the synthesis of granaticin, a potent inhibitor of protein and nucleic synthesis, will be completed with an application of organo-nickel intermediates.