Reaction of acetophenone hydrazones with TeCl4 in the presence of DBU in CH2Cl2 at rt gave vinyl ditellurides and tellurides, whereas 2,5-diaryltellurophenes were obtained in refluxing DMF. Interestingly, when 1,2-diphenylethanone hydrazone was used as the substrate, 3-phenylbenzotellurophene was obtained in 45% yield. The reaction would proceed through telluroketone intermediates.
2,5-Diaryltellurophenes: Effect of Electron-Donating and Electron-Withdrawing Groups on their Optoelectronic Properties
作者:Noriyoshi Nagahora、Shuhei Yahata、Shoko Goto、Kosei Shioji、Kentaro Okuma
DOI:10.1021/acs.joc.7b02906
日期:2018.2.16
The transformation of 1,2-bis(1-arylvinyl)ditellurides into 2,5-diaryltellurophenes by sequential ditelluride exchange and thermal intramolecular cyclization reactions is presented, and the optoelectronicproperties of a series of 2,5-diaryltellurophenes with both electron-donating and electron-withdrawing aryl substituents are disclosed. Furthermore, the multicolored emissive tellurophenes in solution
Synthesis and Stille Cross-Coupling Reactions of 2-(Tributylstannyl)- and 2,5-Bis(trimethylstannyl)tellurophene
作者:Chad Stephens、Daniel Sweat
DOI:10.1055/s-0029-1216958
日期:2009.10
Herein, we describe the synthesis and Stillecross-coupling reactions of 2-(tributylstannyl)- and 2,5-bis(trimethylstannyl)tellurophene. The reactions were most optimal when using aryl iodides as coupling partners, and a mixed catalyst system consisting of tetrakis(triphenylphosphine)palladium(0) and copper(I) iodide, together with cesium fluoride as additive, in N,N-dimethylformamide. This is the
Heterocyclic Diamidine DNA Ligands as HOXA9 Transcription Factor Inhibitors: Design, Molecular Evaluation, and Cellular Consequences in a HOXA9-Dependant Leukemia Cell Model
作者:Sabine Depauw、Mélanie Lambert、Samy Jambon、Ananya Paul、Paul Peixoto、Raja Nhili、Laura Marongiu、Martin Figeac、Christelle Dassi、Charles Paul-Constant、Benjamin Billoré、Arvind Kumar、Abdelbasset A. Farahat、Mohamed A. Ismail、Ekaterina Mineva、Daniel P. Sweat、Chad E. Stephens、David W. Boykin、W. David Wilson、Marie-Hélène David-Cordonnier
DOI:10.1021/acs.jmedchem.8b01448
日期:2019.2.14
Most transcription factors were for a long time considered as undruggable targets because of the absence of binding pockets for direct targeting. HOXA9, implicated in acute myeloid leukemia, is one of them. To date, only indirect targeting of HOXA9 expression or multitarget HOX/PBX protein/protein interaction inhibitors has been developed. As an attractive alternative by inhibiting the DNA binding, we selected a series of heterocyclic diamidines as efficient competitors for the HOXA9/DNA interaction through binding as minor groove DNA ligands on the HOXA9 cognate sequence. Selected DB818 and DB1055 compounds altered HOXA9-mediated transcription in luciferase assays, cell survival, and cell cycle, but increased cell death and granulocyte/monocyte differentiation, two main HOXA9 functions also highlighted using transcriptomic analysis of DB818-treated murine Hoxa9-transformed hematopoietic cells. Altogether, these data demonstrate for the first time the propensity of sequence-selective DNA ligands to inhibit HOXA9/DNA binding both in vitro and in a murine Hoxa9-dependent leukemic cell model.