Syntheses of 12<i>H</i>-benzo[<i>a</i>]xanthen-12-ones and benzo[<i>a</i>]acridin-12(7<i>H</i>)-ones through Au(<scp>i</scp>)-catalyzed Michael addition/6-<i>endo</i>-trig cyclization/aromatization cascade annulation
cascade cyclization strategy to synthesize both 12H-benzo[a]xanthen-12-ones and benzo[a]acridin-12(7H)-ones, whose core motifs xanthone and acridone both exist as important scaffolds in an immense number of bioactive compounds, was developed. The scopes of this strategy were examined by using a batch of synthetic 1,3-diphenylprop-2-yn-1-one substrates. To probe the mechanism of this cyclization a control
一种多面金(I)催化芳香性驱动的双6-内联双级环化策略,可合成其核心的12 H-苯并[ a ]黄嘌呤-12-酮和苯并[ a ] ac啶-12(7 H)-酮开发了基序黄酮和and啶酮,它们作为重要的支架存在于大量的生物活性化合物中。通过使用一批合成的1,3-二苯基丙-2-yn-1-one底物检查了该策略的范围。为了探索这种环化的机理,进行了合成中间体的对照实验。因此,根据该实验和先前的研究确定了推定的机制。
A Novel Palladium-Based Heterogeneous Catalyst for Tandem Annulation: A Strategy for Direct Synthesis of Acridones
作者:Darío C. Gerbino、H. Sebastián Steingruber、Pamela Mendioroz、M. Julia Castro、María A. Volpe
DOI:10.1055/s-0042-1751371
日期:2023.2
In order to develop an efficient, rapid, and modular cascade strategy for the direct synthesis of acridones, palladium supported on sulfated alumina and microwave activation are employed. Multifunctional heterogeneous palladium catalysts were prepared in order to carry out the sequential annulation via a Buchwald–Hartwig amination followed by an intramolecular annulation in a one-pot process. This