A novel intramolecular oxidative coupling reaction has been established to prepare benzofuran derivatives via direct C(sp2)–H functionalization for the formation of C–O bonds. This transformation is mediated by I2/TBHP/NaN3 under metal-free conditions and a catalytic amount of NaN3 plays a crucial role in the reaction.
An advanced and novel one-pot synthetic method for diverse benzo[c]chromen-6-ones by transition-metal free mild base-promoted domino reactions of substituted 2-hydroxychalcones with β-ketoesters and its application to polysubstituted terphenyls
作者:Tej Narayan Poudel、Yong Rok Lee
DOI:10.1039/c3ob41800f
日期:——
one-pot syntheses of a variety of benzo[c]chromen-6-one derivatives were accomplished using Cs2CO3-promoted reactions between substituted 2-hydroxychalcones and β-ketoesters. These reactions involved domino Michael addition/intramolecular aldol/oxidative aromatization/lactonization and provided a rapid synthetic route for the production of biologically interesting novel benzo[c]chromen-6-one molecules bearing
利用取代的2-羟基查耳酮和β-酮酸酯之间的Cs 2 CO 3促进反应,可以完成新颖且有效的一锅合成各种苯并[ c ] chromen-6-一衍生物的反应。这些反应涉及多米诺骨牌迈克尔加成/分子内羟醛/氧化芳构化/内酯化,并提供了快速的合成路线,用于生产生物学上令人关注的新型苯并[ c ] chromen-6-分子,该分子在苯环上带有多个不同的取代基。作为该方法的一种应用,几种合成的苯并[ c ] chromen-6-ones被转化为高度官能化的新型三联苯。
Cationic-lanthanide-complex-catalyzed reaction of 2-hydroxychalcones with naphthols: Facile synthesis of 2,8-dioxabicyclo[3.3.1]nonanes
作者:Yanan Zhu、Zhigang Yao、Fan Xu
DOI:10.1016/j.tet.2018.06.038
日期:2018.8
Cationic lanthanide complexes [Ln(CH3CN)9]3+[(AlCl4)3]3–·CH3CN served as efficient catalysts for the tandem Friedel–Crafts alkylation/ketalization reaction of 2-hydroxychalcones with naphthols/substituted phenols to produce diaryl-fused 2,8-dioxabicyclo[3.3.1]nonanes in moderate to high yields. The high catalytic efficiency of the cationic lanthanide complex [Yb(CH3CN)9]3+[(AlCl4)3]3–·CH3CN compared