Synergistic Lewis–Brønsted Acid Catalysis in Cascade Cyclization of <i>ortho</i>-Alkynylaryl Cyclopropylketones for the Synthesis of 2,3-Dihydronaphtho[1,2-<i>b</i>]furans
作者:Kanokwan Jaithum、Charnsak Thongsornkleeb、Jumreang Tummatorn、Somsak Ruchirawat
DOI:10.1021/acs.joc.2c01940
日期:2022.11.18
In this work, a synthetic method for the synthesis of 2,3-dihydronaphtho[1,2-b]furans employing synergistic Lewis–Brønsted Acid catalyzed cyclization of ortho-alkynylarylcyclopropylketones has been developed. Benefits of our method included low catalyst loading, low cost of catalyst, short reaction time, and mild conditions which could be applied to a broad range of substrates, including a terminal
在这项工作中,开发了一种合成 2,3-二氢萘并 [1,2- b ] 呋喃的合成方法,该方法采用协同 Lewis-Brønsted 酸催化邻炔基芳基环丙基酮的环化。我们方法的优点包括催化剂负载量低、催化剂成本低、反应时间短和条件温和,可应用于广泛的底物,包括末端炔烃 (R = H),以提供所需的通常高产率产品。此外,我们还发现 2,3-二氢萘[1,2- b]呋喃衍生物可以在酸性条件下通过 Friedel-Crafts 型烷基化以良好至优异的收率异构化得到 5,6-二氢四苯-7-醇类似物。然而,这些产品并不稳定,并逐渐转化为相应的醌类化合物。通过在 NaHCO 3存在下用m -CPBA处理成功获得感受态转化,以良好至极佳的收率提供所需的醌产物。