An Indenone Synthesis Involving a New Aminotransfer Reaction and Its Application to Dibenzopentalene Synthesis
作者:Kenta Katsumoto、Chitoshi Kitamura、Takeshi Kawase
DOI:10.1002/ejoc.201100575
日期:2011.7.13
in good yield. Control experiments revealed that the reactions proceed through a multi-step reaction sequence involving a novel intramolecular transamination to the α-acetylenic carbon of the alkynyl group. The method was applicable to the synthesis of dibenzopentalene derivatives as well as various indenone derivatives. A mechanism for the reaction is discussed.
通过用 tBuLi 处理邻(苯基乙炔基)溴苯而产生的邻(苯基乙炔基)苯基锂,用 N,N-二甲基甲酰胺猝灭,在酸性处理后以中等至良好的产率得到各种 2-苯基茚酮衍生物。锂化试剂的选择至关重要。当使用正丁基锂时,产率降低。碳酰胺中的 N-烷基也很重要:用 N,N-二乙基苯甲酰胺淬灭也得到 2,3-二苯基茚酮作为唯一的分离产物,但用 N-苯甲酰基哌啶淬灭导致 2-苯甲酰甲苯以良好的收率。对照实验表明,反应通过多步反应序列进行,涉及到炔基的 α-炔碳的新型分子内转氨作用。该方法适用于二苯并戊烯衍生物以及各种茚酮衍生物的合成。讨论了反应机理。