Rigid-Core Fluorescent Oligothiophene-S,S-dioxide Isothiocyanates. Synthesis, Optical Characterization, and Conjugation to Monoclonal Antibodies
摘要:
In this paper we report the synthesis of a new class of fluorescent thiophene-based isothiocyanates containing a 3,5-disubstituted dithieno[3,2-b:2',3'-d]thiophene-4,4-dioxide moiety as the rigid core, using the palladium-catalyzed cross-coupling reaction of aryl stannanes with aryl bromides (Stille coupling). By changing the molecular structure through the progressive addition of thienylene or phenylene units, light emission from blue to orange was obtained. Photoluminescence quantum yields ranged from 0.65 to 0.90 for blue and green light emitters to 0.10-0.35 for yellow and orange ones. Optically and chemically stable fluorescent bioconjugates were prepared by spontaneous reaction of the isothiocyanates with monoclonal antibodies anti-CD3 and anti-CD8 in slightly basic solutions.
Pd/C as a Catalyst for Completely Regioselective CH Functionalization of Thiophenes under Mild Conditions
作者:Dan-Tam D. Tang、Karl D. Collins、Johannes B. Ernst、Frank Glorius
DOI:10.1002/anie.201309305
日期:2014.2.10
The completely C3‐selective arylation of thiophenes and benzo[b]thiophenes was achieved by using Pd/C as a heterogeneous catalyst without ligands or additives undermild reaction conditions. The practicability of this transformation is demonstrated by notable functional group tolerance and the insensitivity of the reaction to H2O and air. This method is also applicable to nitrogen‐ and oxygen‐containing
通过在温和的反应条件下使用Pd / C作为不带配体或添加剂的非均相催化剂,可以实现噻吩和苯并[ b ]噻吩的完全C3选择性芳基化。该转化的实用性通过显着的官能团耐受性和反应对H 2 O和空气的不敏感性得到证明。该方法也适用于含氮和氧的杂环,产生相应的C2芳基化产物。三相试验以及汞中毒和热过滤试验表明,催化活性物质在性质上是异质的。
Zirconium-redox-shuttled cross-electrophile coupling of aromatic and heteroaromatic halides
作者:Ting-Feng Wu、Yue-Jiao Zhang、Yue Fu、Fang-Jie Liu、Jian-Tao Tang、Peng Liu、F. Dean Toste、Baihua Ye
DOI:10.1016/j.chempr.2021.06.007
日期:2021.7
palladium-catalyzed processes. The zirconaaziridine-mediated palladium (ZAPd)-catalyzed reaction shows excellent compatibility with various functional groups and diverse heteroaromatic scaffolds. In accord with density functional theory (DFT) calculations, a redox transmetallation between the oxidativeaddition product and the zirconaaziridine is proposed as the crucial elementary step. Thus, cross-coupling selectivity
Impregnated palladium on magnetite as catalyst for direct arylation of heterocycles
作者:Rafael Cano、Juana M. Pérez、Diego J. Ramón、Gerard P. McGlacken
DOI:10.1016/j.tet.2015.12.039
日期:2016.2
magnetite is an efficient, cheap and easy to prepare catalyst for the direct arylation of heterocycles. Good yields are afforded under relatively mild conditions and a broad substrate scope is evident. The catalyst is regioselective in many cases, affording arylated products, at the C2- or C3-position (depending of the heterocycle used). The methodology can be extended to prepare chromenes through an intramolecular
Preparation and coupling reaction of thienylmanganese bromides
作者:Seung-Hoi Kim、Reuben D. Rieke
DOI:10.1016/s0040-4039(96)02507-5
日期:1997.2
3-Thienylmanganese bromide, 3-bromo-4-thienylmanganese bromide and 4-substituted 3-thienylmanganese bromides were prepared from the reactions of Rieke manganese with 3-bromothiophene, 3,4-dibromothiophene and 4-substituted 3-bromothiophenes, respectively. The resulting thienylmanganese bromides underwent cross-coupling reactions under mild reaction conditions.
Identification and Structure–Activity Relationships of a Novel Series of Estrogen Receptor Ligands Based on 7-Thiabicyclo[2.2.1]hept-2-ene-7-oxide
作者:Pengcheng Wang、Jian Min、Jerome C. Nwachukwu、Valerie Cavett、Kathryn E. Carlson、Pu Guo、Manghong Zhu、Yangfan Zheng、Chune Dong、John A. Katzenellenbogen、Kendall W. Nettles、Hai-Bing Zhou
DOI:10.1021/jm201556r
日期:2012.3.8
and activities, we have explored compounds in which the central hydrophobic core has a more three-dimensional topology than typically found in estrogen ligands and thus exploits the unfilled space in the ligand-binding pocket. Here, we build upon our previous investigations of 7-oxabicyclo[2.2.1]heptene core ligands, by replacing the oxygen bridge with a sulfoxide. These new 7-thiabicyclo[2.2.1]hept-2-ene-7-oxides