Oxazolines as Dual-Function Traceless Chromophores and Chiral Auxiliaries: Enantioselective Photoassisted Synthesis of Polyheterocyclic Ketones
作者:Olga A. Mukhina、Andrei G. Kutateladze
DOI:10.1021/jacs.5b12690
日期:2016.2.24
phenone functionality. Variations in linkers allow for access to diverse core scaffolds in the primary photoproducts, rendering the approach compatible with the philosophy of diversity-oriented synthesis. Chiral oxazolines, readily available from the corresponding amino alcohols, yield enantioenriched keto-polyheterocycles of complex topologies with enantiomeric excess values up to 90%.
2-(邻氨基苯基)氧杂-和-噻唑啉经历激发态分子内质子转移(ESIPT),生成能够与束缚的不饱和侧基进行分子内[4+2]和[4+4]环加成的氮杂-邻二甲苯。主要光产物、螺恶唑烷和噻唑烷在温和条件下容易水解,揭示苯酮功能。连接体的变化允许访问主要光产物中的不同核心支架,使该方法与面向多样性的合成理念兼容。手性恶唑啉很容易从相应的氨基醇中获得,可产生复杂拓扑结构的对映体富集的酮多杂环,对映体过量值高达 90%。