2-Arylthieno[3,2-b]thiophenes 1 have been synthesized by palladium catalysed arylation reactions of thieno[3,2-b]thiophene 2 and intramolecular cyclisations of 2,3-substituted thiophenes 7. A comparative study of the different methods is presented.
Palladium-Catalyzed C–S Coupling: Access to Thioethers, Benzo[<i>b</i>]thiophenes, and Thieno[3,2-<i>b</i>]thiophenes
作者:Marius Kuhn、Florian C. Falk、Jan Paradies
DOI:10.1021/ol2016093
日期:2011.8.5
formation/cross-coupling/cyclization domino reaction using thiourea as a cheap and easy to handle dihydrosulfide surrogate has been developed. Structurally important biarylthioether, benzo[b]thiophenes, and thieno[3,2-b]thiophene scaffolds are provided in high yield.
已经开发出了第一个使用硫脲作为便宜且易于处理的二氢硫代用品的C-S键形成/交叉偶联/环化多米诺反应。以高收率提供结构上重要的联芳基硫醚,苯并[ b ]噻吩和噻吩并[3,2- b ]噻吩支架。
Acid-Base-Responsive Intense Charge-Transfer Emission in Donor-Acceptor-Conjugated Fluorophores
report on the synthesis and acid‐responsive emission properties of donor–acceptor (D–A) molecules that contain a thienothiophene unit. 2‐Arylthieno[3,2‐b]thiophenes were conjugated with an N‐methylbenzimidazole unit to form acid‐responsive D–A‐type fluorophores. The D–A‐conjugated fluorophores showed intense intramolecular charge‐transfer (ICT) emission in response to acid. The effect of the substitution
本文中我们报告了含有噻吩并噻吩单元的供体-受体(DA)分子的合成和酸响应发射特性。2-Arylthieno [3,2- b ]噻吩与N偶联-甲基苯并咪唑单元,形成对酸敏感的D-A型荧光团。D–A共轭的荧光团显示出对酸的强烈分子内电荷转移(ICT)发射。取代对其光物理性质及其溶剂依赖性的影响表明质子化的D–A分子中ICT的发射没有扭曲。讨论了2-芳基噻吩并噻吩作为供体的喹诺酮特性,因为它被认为有助于抑制激发态下的分子扭曲,因此降低了非辐射速率常数,从而导致强烈的ICT发射。酸碱敏感的三色发射也可以通过在供体部分引入碱敏感的酚基来实现。
Programmed Site-Selective Palladium-Catalyzed Arylation of Thieno[3,2<i>-b</i>
]thiophene
作者:T. M. Ha Vuong、Didier Villemin、Hung-Huy Nguyen、Tin Thanh Le、Tung T. Dang、Hien Nguyen
DOI:10.1002/asia.201700562
日期:2017.11.2
2‐b]thiophenes were synthesized by direct site‐selective Pd‐catalyzed C−H activation reactions with various arylbromides in the presence of a phosphine‐free Pd(OAc)2/KOAc catalyst system in N,N‐dimethylacetamide (DMAc). The arylation of 2‐arylthieno[3,2‐b]thiophene took place at the C3 position if the 2‐aryl substituents possessed electron‐withdrawing groups and at the C5 position if they were bulky and
单,二,三和四芳基噻吩并[3,2- b ]噻吩是在无膦的Pd(OAc)存在下,通过直接位点选择性Pd催化的CH活化反应与各种芳基溴化物合成的。 )2 / KOAc在N,N-二甲基乙酰胺(DMAc)中的催化剂体系。如果2-芳基取代基具有吸电子基团,则芳基噻吩并[3,2 -b ]噻吩的芳基化反应将在C3位置发生;如果它们较大且具有给电子基团,则芳基化在C5位置。
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