摘要 我们提出了有效的合成方案,用于官能化具有羟基,硝基或氰基的二苯并噻吩,二苯并呋喃和咔唑。这些供体-受体生色团的合成基于使用适当取代的芳族硼酸的关键Suzuki-Miyaura偶联。随后的分子内S N Ar反应可形成二苯并噻吩和二苯并呋喃支架,而碳氢活化反应可得到咔唑。最终的脱甲基步骤揭示了三环发色团的酚部分。还研究了这些生色团的苯酚和酚盐形式的紫外/可见吸收特性。 我们提出了有效的合成方案,用于官能化具有羟基,硝基或氰基的二苯并噻吩,二苯并呋喃和咔唑。这些供体-受体生色团的合成基于使用适当取代的芳族硼酸的关键Suzuki-Miyaura偶联。随后的分子内S N Ar反应可形成二苯并噻吩和二苯并呋喃支架,而碳氢活化反应可得到咔唑。最终的脱甲基步骤揭示了三环发色团的酚部分。还研究了这些生色团的苯酚和酚盐形式的紫外/可见吸收特性。
Synthesis of Functionalized Dibenzothiophenes - An Efficient Three-Step Approach Based on Pd-Catalyzed C-C and C-S Bond Formations
作者:Tue Heesgaard Jepsen、Mogens Larsen、Morten Jørgensen、Katarzyna A. Solanko、Andrew D. Bond、Anders Kadziola、Mogens Brøndsted Nielsen
DOI:10.1002/ejoc.201001393
日期:2011.1
A novel and efficientthree-step protocol for synthesizing functionalizeddibenzothiophenes (DBTs) from common starting materials and by using palladium-catalyzed carbon-carbon and carbon-sulfur bondformations is presented. The reaction conditions offer significantly improved functional-group tolerance and regioselectivity as compared to previously reported methods.
Using an easily prepared triethylammonium N‐benzyldithiocarbamate salt as a sulfur source, a dual C−S functionalization of cyclic diaryliodoniums to form tricyclic thioheterocycles is realized. Our method uses the readily available copper sulfate to accelerate the chemical transformation under mild conditions. A broad range of cyclic diaryliodoniums with a ring size from 5‐ to 7‐membered can be employed
dibenzofuran, and carbazole with hydroxy and nitro or cyano groups. The synthesis of these donor–acceptor chromophores is based on a key Suzuki–Miyaura coupling using an appropriately substituted aromatic boronic acid. Subsequent intramolecular SNArreaction allows formation of the dibenzothiophene and dibenzofuran scaffolds, while a carbon–hydrogen activationreaction is employed to afford the carbazole.
摘要 我们提出了有效的合成方案,用于官能化具有羟基,硝基或氰基的二苯并噻吩,二苯并呋喃和咔唑。这些供体-受体生色团的合成基于使用适当取代的芳族硼酸的关键Suzuki-Miyaura偶联。随后的分子内S N Ar反应可形成二苯并噻吩和二苯并呋喃支架,而碳氢活化反应可得到咔唑。最终的脱甲基步骤揭示了三环发色团的酚部分。还研究了这些生色团的苯酚和酚盐形式的紫外/可见吸收特性。 我们提出了有效的合成方案,用于官能化具有羟基,硝基或氰基的二苯并噻吩,二苯并呋喃和咔唑。这些供体-受体生色团的合成基于使用适当取代的芳族硼酸的关键Suzuki-Miyaura偶联。随后的分子内S N Ar反应可形成二苯并噻吩和二苯并呋喃支架,而碳氢活化反应可得到咔唑。最终的脱甲基步骤揭示了三环发色团的酚部分。还研究了这些生色团的苯酚和酚盐形式的紫外/可见吸收特性。