Expanding the Utility of Brønsted Base Catalysis: Biomimetic Enantioselective Decarboxylative Reactions
作者:Yuanhang Pan、Choon Wee Kee、Zhiyong Jiang、Ting Ma、Yujun Zhao、Yuanyong Yang、Hansong Xue、Choon-Hong Tan
DOI:10.1002/chem.201100687
日期:2011.7.18
of simple esters, the use of them as nucleophiles in direct asymmetric transformations is a long‐standing challenge in synthetic organic chemistry. Nature approaches this difficulty through a decarboxylative mechanism, which is used for polyketide synthesis. Inspired by nature, we report guanidine‐catalyzed biomimetic decarboxylative CC and CN bond‐formation reactions. These highly enantioselective
由于简单酯的低反应性,在直接有机不对称转化中将它们用作亲核试剂是合成有机化学中的长期挑战。大自然通过用于聚酮化合物合成的脱羧机理解决了这一难题。受自然界的启发,我们报告了胍催化的仿生脱羧剂CC和CN个键形成反应。这些高度对映选择性的脱羧曼尼希和胺化反应利用丙二酸半硫酯作为简单的酯替代物。提议在机理中亲核加成先于脱羧作用,对此已通过使用电喷雾电离(ESI)质谱分析和DFT计算来鉴定中间体进行了详细研究。