描述了在快速光解和连续照射下,包括二苯并噻吩核的新的2,2-二苯基-2 H -1-苯并吡喃的合成和光致变色性质。在快速光解下,所有化合物在室温下的溶液中均表现出光致变色行为,但在连续照射下未观察到相同的现象。与参考化合物相比,观察到一般的红移和开放形式的Vis光谱中存在两个吸收带,从而导致吸收范围内出现发色。杂芳基化对光谱动力学参数的影响是可变的,并且取决于稠合的苯并噻吩部分的位置和几何形状。2 H的C(6)中吸电子取代基的作用分析了在7,8位融合了苯并噻吩核的-1-苯并吡喃骨架。
A Pd-catalyzed optional approach for the synthesis of dibenzothiophenes
作者:Juan Song、Hao Wu、Wei Sun、Songjiang Wang、Haisen Sun、Kang Xiao、Yan Qian、Chao Liu
DOI:10.1039/c8ob00235e
日期:——
A direct and practical approach for the construction of DBTs was developed via a Pd-catalyzed tandem reaction, in which commercially available o-bromo-iodobenzenes combined with benzene thiols or iodobenzenes combined with o-bromo-benzene thiols were applied. These two approaches will provide an alternative for the synthesis of DBT derivatives.
Synthesis and properties of thieno[2,3-d:5,4-d’]bisthiazoles and their oxidized derivatives: Thionyl chloride as a sulfurative ring-fusing reagent towards thiophene-based ring-fused heteroaromatic compounds
A new route to thiophene-ring-fused compounds with thionylchloride as a sulfur source was developed. Use of an excess amount thionylchloride directly gave the corresponding thiophene-ring-fused compound via further reduction of generated thiophene-S-oxide with excess thionylchloride in some cases. One-pot reduction with tributylphosphine also gave thiophene-ring-fused compounds in good yields, and
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
A palladium-catalyzed synthesis of dibenzothiophenes from 2-biphenylthiols is described. This highly efficient reaction employs a simple PdCl2/DMSO catalytic system, in which PdCl2 is the sole metal catalyst and DMSO functions as an oxidant and solvent. This transformation has broad substrate scope and operational simplicity and proceeds in high yield. The synthetic utility was demonstrated by the
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.