Asymmetric Synthesis Using N-O Compounds

描述（由申请人提供）：本研究提案描述了基于N-O化合物新化学的有效不对称催化的开发。这项研究将针对三个目标。 第一个目标将是设计一种真正有用和实用的烯烃醇，烯烃，硫化物和膦的不对称氧化的金属催化剂。该方法在很大程度上依赖于我们以前的观察钒不对称环氧化催化剂，独特的异羟肟酸库开发。我们打算合成一些新的异羟肟酸配体库，并评估它们在钒催化的不对称环氧化反应中的对映选择性和反应性。 第二个主题将集中在新的羟基氨基和氨基氧羰基化合物的选择性合成。在刘易斯酸催化剂存在下，使用简单的亚硝基起始原料，可以将各种羰基化合物转化为新的羟基氨基和氨基氧基衍生物。此外，通过这种方法，将获得氧和氮官能团α-羰基化合物的不对称催化引入，并用作手性天然和非天然产物合成的关键合成反应。 第三个努力将是开发新的不对称质子化在醇溶剂中使用金属催化剂与异羟肟酸和相关的N-O配体库。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，但尚未发展到有用的水平。 总的来说，所有这些目标预计不仅会导致高效催化不对称合成的发展，而且还会导致新方法和概念的发展，这些新方法和概念将提供许多有用的有机合成努力以及进入各种N-O化合物的新途径，这些化合物在生物学上是一类非常重要的分子。

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.