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Addition Reactions of Benzothiophen. Part 3. Addition and Ring-opening Reactions with Phenolic Ethers

In the presence of aluminium chloride, anisole, phenetole, diphenyl ether, and (methylthio)benzene are added rapidly across the 2,3-bond in benzothiophen to give, inter alia, a mixture of 2- and 3-(p-substituted aryl)-2,3-dihydrobenzothiophens (3) and (4).Contrary to expectation, the 2-isomer predominates in all cases, and the addition is irreversible.Reaction with anisole also leads to a novel ring-opened product, viz. (E)-4-methoxy-2′-methylthiostilbene (9a), which was synthesised unambigiuously.It is believed that benzothiophen is S-methylated by PhOMe-AlCl3 in a ‘push-pull’ reaction, and that the resulting positive charge is delocalised into the ring, thus allowing the 2-position to participate in electrophilic attack on a second molecule of anisole.The resulting quadrivalent sulphur intermediate achieves stabilisation by means of a rapid ring-opening reaction.Other aromatic methyl ethers give analogous products, but phenetole diphenyl ether, and (methylthio)benzene do not promote ring-opening.The ring-opening reaction is aided by the addition of MeBr- or EtBr-AlCl3; even phenetole will then undergo ring-opening.Under these conditions the S-alkyl group in the ring-opened product comes from the starting ether, and not from the added MeBr or EtBr.

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Benzothiophene – Wikipedia,
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Palladium-catalyzed difluoromethylation of heteroaryl chlorides, bromides and iodides

A palladium-catalyzed difluoromethylation of a series of heteroaryl chlorides, bromides and iodides under mild conditions is described. A wide range of heteroaryl halides such as pyridyl, pyrimidyl, pyrazyl, funanyl, thienyl, pyazolyl, imidazolyl, thiazolyl, and oxazolyl halides were efficiently difluoromethylated, thus providing medicinal chemists an alternative choice for the preparation of drug candidates with the difluoromethylated heteroarene unit.

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Benzothiophene – Wikipedia,
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USE OF TRANSITION METAL CARBENE COMPLEXES IN ORGANIC LIGHT-EMITTING DIODES (OLEDS)

The invention relates to the use of transition metal carbene complexes in organic light-emitting diodes (OLEDS), to a light-emitting layer, a blocking layer for electrons or excitrons or a blocking layer for holes containing these transition metal carbene complexes, OLED’s containing these transition metal carbene complexes, devices, which contain an inventive OLED, and to transition metal carbene complexes.

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Benzothiophene – Wikipedia,
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2,2′-thienylbenzothiophenes, their preparation and their use for controlling pests

2,2′-Thienylbenzothiophenes of the general formula I STR1 where R1 and R3 independently of one another are each halogen, alkyl, haloalkyl, alkoxy or haloalkoxy, R2 is hydrogen, halogen, alkyl, haloalkyl, alkoxy or haloalkoxy, n is 0, 1 or 2, and the radicals may be different when n is 2, and m is 0, 1, 2, 3 or 4, and the radicals may be different when m is 2, 3 or 4, processes for their preparation, pesticides containing them and the use thereof.

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Benzothiophene – Wikipedia,
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Design and synthesis of 4-heteroaryl 1,2,3,4-tetrahydroisoquinolines as triple reuptake inhibitors

(Chemical Equation Presented) A series of 4-bicyclic heteroaryl 1,2,3,4-tetrahydroisoquinoline inhibitors of the serotonin transporter (SERT), norepinephrine transporter (NET), and dopamine transporter (DAT) was discovered. The synthesis and structure-activity relationship (SAR) of these triple reuptake inhibitors (TRIs) will be discussed. Compound 10i (AMR-2), a very potent inhibitor of SERT, NET, and DAT, showed efficacy in the rat forced-swim and mouse tail suspension models with minimum e ffective doses of 0.3 and 1 mg/kg (po), respectively. At efficacious doses in these assays, 10i exhibited substantial occupancy levels at the three transporters in both rat and mouse brain. The study of the metabolism of 10i revealed the formation of a significant active metabolite, compound 13.

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Benzothiophene – Wikipedia,
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Copper- and Cobalt-Catalyzed Syntheses of Thiophene-Based Tertiary Amines

Thienylzinc halides and related compounds prepared by deprotonation followed by transmetalation were used in copper-catalyzed amination using N-benzoyloxy secondary amines. By extending the reaction to 1,5-naphthyridine, it was showed that the competitive dimer formation observed in the case of thiophenes was linked with the low stability of some thienylamines rather than homocoupling. Interestingly, thienylzinc halides and related compounds prepared by transmetalation of thienylmagnesium halides, either prepared from their bromo-precursors or generated by deprotometalation, were satisfactorily employed in cobalt-catalyzed aminations. Finally, aminothiophenes were involved in copper-catalyzed mono- and di-N-arylations, affording differently substituted di- and triphenylamines.

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Benzothiophene – Wikipedia,
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Palladium-catalyzed carbonylative synthesis of N-(2-cyanoaryl)benzamides and sequential synthesis of quinazolinones

A convenient procedure for the synthesis of N-(2-cyanoaryl)benzamides has been developed. Using aryl bromides and 2-aminobenzonitriles as the substrates, Mo(CO)6 as the CO source, the desired amides were produced in good yields. Quinazolinones were produced in good yields in a sequential manner as well.

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Benzothiophene – Wikipedia,
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NaBH4-TMEDA and a palladium catalyst as efficient regio- and chemoselective system for the hydrodehalogenation of halogenated heterocycles

The pair NaBH4-TMEDA as hydride source and a palladium catalyst in THF prove to be an efficient system for the hydrodehalogenation of halogenated heterocycles with one or more heteroatoms. In general, Pd(OAc) 2-PPh3 rapidly hydrodehalogenates reactive halo-heterocycles such as bromo-pyridines, -quinolines, -thiophenes, -indoles, -imidazoles, etc., at room temperature in very good yields, whereas in most cases PdCl2(dppf) reduces less reactive halides such as chloro-pyridines, -quinolines, -pyrimidines and bromo-indoles, -benzofurans, etc. Moreover, PdCl2(tbpf) shows to be even more active removing the 2- and 5-chlorine from both thiophene and thiazole rings. The reaction conditions tolerate various functional groups, allowing highly chemoselective reactions in the presence of halide, ester, alkyne, alkene and nitrile substituents. Moreover, with a proper selection of the catalyst it is also possible to obtain a good control in the regioselective hydrodehalogenation of a variety of polyhalogenated substrates.

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Benzothiophene – Wikipedia,
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COMPOUND FOR ORGANIC ELECTRONIC ELEMENT, ORGANIC ELECTRONIC ELEMENT USING THE SAME, AND A ELECTRONIC DEVICE THEREOF

The present invention provides a, novel compound capable of improving luminous efficiency and lifetime of a device, and an organic electronic element using the same, and an electronic device. using the same. (by machine translation)

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Benzothiophene – Wikipedia,
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MIXED LINEAGE KINASE INHIBITORS AND METHOD OF TREATMENTS

Provided herein are imidazopyridine compounds having an inhibitory effect on mixed lineage kinases (MLKs), methods of their synthesis, and methods of their therapeutic. Also provided are pharmaceutical compositions comprising the compounds and methods of using the compounds and pharmaceutical compositions.

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Benzothiophene – Wikipedia,
Benzothiophene | C8H6S – PubChem