Chemo-Enzymatic Metathesis/Aromatization Cascades for the Synthesis of Furans: Disclosing the Aromatizing Activity of Laccase/TEMPO in Oxygen-Containing Heterocycles
作者:Caterina Risi、Fei Zhao、Daniele Castagnolo
DOI:10.1021/acscatal.9b02452
日期:2019.8.2
The unprecedented Trametes versicolor laccase/TEMPO-catalyzed aromatization of 2,5-dihydrofurans to furans is described. A variety of furan derivatives have been synthesized in moderate to high conversions (21–99%) and yields (20–76%) under mild reaction conditions. This work reveals the aromatization ability of the Trametes versicolor laccase/TEMPO system in synthesizing oxygen-containing heterocycles
Au nanoparticlessupported on TiO2 (1 mol %) catalyze the quantitative cycloisomerization of conjugated allenones into furans under very mild conditions. The reaction rate is accelerated by adding acetic acid (1 equiv), but the acid does not participate in the protodeauration step as in the corresponding Au(III)-catalyzed transformation. The process is purely heterogeneous, allowing thus the recycling
作者:Pat Forgione、Marie-Christine Brochu、Miguel St-Onge、Kris H. Thesen、Murray D. Bailey、François Bilodeau
DOI:10.1021/ja063511f
日期:2006.9.1
Aryl-substituted five-membered heteroaromatics have attracted great interest over the past years due to their presence in a large number of pharmaceuticals and natural products. Recently, an advance in the preparation of these scaffolds was achieved by employing a C-H functionalization strategy. This method allows easy access to these biaryl motifs by precluding the necessity of preparing specific
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