Access to 2-Alkyltropones via Organic Base-Catalyzed Tandem Deamination and Aldol Condensation of Tropinone-Derived Quaternary Ammonium Salts
作者:Yan Wang、Qian-Qian Wu、Shi-Kai Tian
DOI:10.1021/acs.joc.3c01983
日期:2023.12.1
The tropone skeleton exists in a number of natural products and bioactive substances, and currently, the applications of substituted tropones are significantly limited by their preparative methods. Herein, we report a very convenient method to access 2-alkyltropones via organic base-catalyzed tandem reaction of tropinone-derived quaternary ammonium salts. Tropinone methiodide reacted with a wide variety
托酮骨架存在于许多天然产物和生物活性物质中,目前,取代托酮的应用受到其制备方法的严重限制。在此,我们报道了一种非常方便的方法,通过托品酮衍生的季铵盐的有机碱催化串联反应来获得 2-烷基托酮。托品酮甲碘化物在 1,4-二氮杂双环[2.2.2]辛烷存在下与多种芳香族和脂肪族醛反应,以中等至优异的产率和极高的位点选择性提供结构多样的 2-烷基托酮。该反应采用现成的原料和试剂,不含过渡金属,与水和空气相容,可耐受多种官能团,并且可以轻松扩大规模。此外,该产品适合各种合成转化。初步机理研究表明,该反应通过串联脱氨、羟醛缩合和异构化进行。