Asymmetric Synthesis Using N-O Compounds.

使用 N-O 化合物的不对称合成。

• 批准号: 7121536
• 负责人: HISASHI None YAMAMOTO
• 金额: $ 32.6万
• 依托单位: UNIVERSITY OF CHICAGO
• 依托单位国家: 美国
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-09-01 至 2007-08-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7121536
• 关键词: alkenes; carbonyl compound; catalyst; chemical registry /resource; chemical synthesis; combinatorial chemistry; hydroxylamine; metals; molecular asymmetry; nitric oxide; oxidation; phosphines; protonation; stereochemistry; sulfides; technology /technique development

DESCRIPTION (provided by applicant): This research proposal describes the development of an efficient asymmetric catalysis based on the new chemistry of N-O compounds. The research will be directed towards three goals. The first goal will be to design a metal catalyst for a truly useful and practical asymmetric oxidation of olefinic alcohols, alkenes, sulfides, and phosphines. The method heavily depends on our previous observations of vanadium asymmetric epoxidation catalyst for which unique hydroxamic acid libraries were developed. We intend to synthesize a number of new hydroxamic acid ligand libraries and evaluate them for enantioselectivity and reactivity in vanadium-catalyzed asymmetric epoxidation. The second theme will focus on selective synthesis of new hydroxyamino and aminooxy carbonyl compounds. Using simple nitroso starting materials in the presence of Lewis acid catalysts, various carbonyl compounds could be converted to new hydroxyamino and aminooxy derivatives. Furthermore, with this approach, asymmetric catalytic introduction of oxygen and nitrogen functional groups alpha to carbonyl compounds will be obtained and used as a key synthetic reaction useful for chiral natural and unnatural product synthesis. The third effort will be to develop new asymmetric protonation in alcoholic solvents using metal catalysts with hydroxamic acid and related N-O ligand libraries. Efficient asymmetric protonation of racemic carbonyl compounds is an important synthetic transformation, which has not been developed to a useful level. Overall, all of these goals are expected to result in not only the development of highly efficient catalytic asymmetric synthesis but also the development of new methods and concepts that should provide a number of useful organic synthesis endeavors as well as new entry into various N-O compounds, which biologically are a highly important class of molecules.

描述（由申请人提供）：本研究提案描述了基于N-O化合物的新化学反应的有效不对称催化的发展。该研究将针对三个目标。 第一个目标是设计一种金属催化剂，以实现烯烃，烯烃，硫化物和磷的真正有用且实用的不对称氧化。该方法在很大程度上取决于我们以前对钒不对称环氧催化剂的观察结果，该催化剂为其开发了独特的羟烷酸文库。我们打算综合许多新的羟烷酸配体库，并评估它们的对钒催化的不对称环氧化的对映选择性和反应性。 第二个主题将集中于选择性合成新的羟基氨基和氨基化羰基化合物。在存在刘易斯酸催化剂的情况下，使用简单的氮气起始材料，可以将各种羰基化合物转换为新的羟基氨基和氨基衍生物。此外，通过这种方法，将获得氧和氮官能团α向羰基化合物的不对称催化引入，并将其用作对手性天然和不自然产物合成有用的关键合成反应。 第三个工作是使用羟糖酸和相关的N-O配体库中的金属催化剂在酒精溶剂中开发新的不对称质子化。外消旋羰基化合物的有效不对称质子化是一种重要的合成转化，尚未开发到有用的水平。 总体而言，所有这些目标都预计不仅会导致高效的催化不对称合成的发展，而且还会发展新方法和概念的发展，这些方法和概念应提供许多有用的有机合成努力以及新的N-O化合物的新入口，这在生物学上是非常重要的分子类别。