Category: benzothiophene

Simple exploration of 2,3-Dibromobenzo[b]thiophene

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Synthesis and Reactions of 2,3,5,6-Tetrahydro-2,5-ethano-3-benzazocin-4(1H)-one and a Thieno-extended Analogue: X-Ray Structure of 3-Methyl-2,3,5,6-tetrahydro-2,5-ethano<1>benzothieno<3,2-d>azocin-4(1H)-one

5,6,7,8,9,10-Hexahydro-6,9-methanobenzocyclo-octen-11-one (3) was prepared through condensation of o-xylene-alpha,alpha’-diyl dibromide with N-cyclopentylidenepyrrolidine and converted by Beckmann rearrangement of its oxime (4) into 2,3,5,6-tetrahydro-2,5-ethano-3-benzazocin-4(1H)-one (6). 2,3-Bis(bromomethyl)benzothiophene was converted similarly into a mixture of 1,4,5,6-tetrahydro-2,5-ethano<1>benzothieno<2.3-d>azocin-3(2H)-one (15) and the isomeric lactam (19).Lactam (6) was N-methylated and both the parent lactam (6) and the N-methyl derivative (23) were reducedwith lithium aluminium hydride to the saturated products (24) and (25), respectively.Conversion of lactam (6) into the corresponding thiolactam (26) with phosphorus pentasulphide followed by alkylation of the latter compound gave an N-(29) or S-alkylated derivative, (27) or (28), depending on the reagent and reaction conditions.Similar reactions are reported also for lactams (15) and (19).The 4(1H)-one structures of compounds (15) – (22) are based on an X-ray analysis of 3-methyl-2,3,5,6-tetrahydro-2,5-ethano<1>benzothieno<3,2-d>azocin-4(1H)-one (20).We also report syntheses of 2-azido-5,6,7,8,9,10-hexahydro-6,9-methanobenzocyclo-octen-11-one (33) and 3-nitro(and 1,3-dinitro)-6,7,8,9,10,11-hexahydro-7,10-methanocyclo-octa<1>benzothiophen-12-one, (36) and (37), respectively.

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More research is needed about 63675-74-1

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Visible light photocatalytic synthesis of benzothiophenes

The photocatalytic reaction of o-methylthio-arenediazonium salts with alkynes yields substituted benzothiophenes regioselectively through a radical annulation process. Green light irradiation of eosin Y initiates the photoredox catalysis. The scope of the reaction was investigated by using various substituted diazonium salts and different alkynes.

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Properties and Exciting Facts About 5-Aminobenzothiophene

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Electric Literature of 20532-28-9, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.20532-28-9, Name is 5-Aminobenzothiophene, molecular formula is C8H7NS. In a Patent£¬once mentioned of 20532-28-9

Elevated intraocular pressure lowering benzo-[b]-thiophene-2-sulfonamide derivatives, compositions, and method of use therefor

Novel 2-sulfamoylbenzo[b]thiophenes and derivatives thereof are shown to be useful for the treatment of elevated intraocular pressure in compositions including ophthalmic drops and inserts.

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Can You Really Do Chemisty Experiments About 7-Chloro-3-hydroxybenzo[b]thiophene-2-carboxylic acid

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7-Substituted Benzothiophenes and 1,2-Benzisothiazoles. Part 2. Chloro and Nitro Derivatives

The 7-chloro and 7-nitro derivatives of benzothiophene and 1,2-benzisothiazole have been prepared from readily available precursors, which for each substituent are common to both ring systems. 7-Chlorobenzothiophene has been obtained from 3-chloro-2-mercaptobenzoic acid via 7-chlorobenzothiophen-3(2H)-one, or from 2,3-dichlorobenzaldehyde, either via beta-(2,3-dichlorophenyl)-alpha-mercaptoacrylic acid (16) or, preferably, via 7-chlorobenzothiophene-2-carboxylic acid.Hexamethylphosphoric triamide is a particularly useful solvent in which to effect the selective nucleophilic replacement of the 2-chloro substituent in 2,3-dichlorobenzaldehyde. 7-Chloro-1,2-benzisothiazole is available by treatment of 3-chloro-2-mercaptobenzaldehyde with chloramine (57percent), or by heating 2,3-dichlorobenzaldehyde with sulphur and aqueous ammonia (46percent). 7-Nitrobenzothiophene has been obtained by treatment of 2-bromo-3-nitrobenzaldehyde with mercaptoacetic acid under alkaline conditions, followed by decarboxylation of the resulting 2-carboxylic acid.Cyclisation of 2-(n- or t-butylthio)-3-nitrobenzaldoxime with polyphosphoric acid gives 7-nitro-1,2-benzisothiazole in high yield. 3-Nitro-2-t-bytylthiobenzaldehyde behaves unexpectedly with chloramine, to give what is believed to be 7-nitro-2-t-butyl-1,2-benzothiazolium chloride (24) (73percent).

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Awesome and Easy Science Experiments about 3-(Bromomethyl)benzo[b]thiophene

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[1]Benzothienoindolizidinones and [1]Benzothienoquinolizidinones: Synthesis and Schmidt rearrangement into [1,3]diazepines derivatives

[1]Benzothienoindolizidinones 5ac,ae,bc and [1]Benzothienoquinolizidinone 5ad were synthesized from 2(3)-bromethyl[1]benzothiophene and methyl prolinate, methyl oxoprolinate and ethyl pipecolinate. The Schmidt rearrangement of ketones 5 led exclusively to the [1,3]diazepines derivatives 6.

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The Absolute Best Science Experiment for 4923-87-9

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In homogeneous catalysis, the catalyst is in the same phase as the reactant. The number of collisions between reactants and catalyst is at a maximum.In a patent, 4923-87-9, name is 5-Bromobenzothiophene, introducing its new discovery. Safety of 5-Bromobenzothiophene

Catalyst shuttling enabled by a thermoresponsive polymeric ligand: Facilitating efficient cross-couplings with continuously recyclable ppm levels of palladium

A polymeric monophosphine ligand WePhos has been synthesized and complexed with palladium(ii) acetate [Pd(OAc)2] to generate a thermoresponsive pre-catalyst that can shuttle between water and organic phases, with the change being regulated by temperature. The structure of the polymeric ligand was confirmed with matrix-assisted laser desorption/ionization-time-of-flight (MALDI-TOF) mass spectrometry and size-exclusion chromatography (SEC) analysis, as well as nuclear magnetic resonance (NMR) measurements. This polymeric metal complex enables highly efficient Pd-catalyzed cross-couplings and tandem reactions using 50 to 500 ppm palladium, and this can facilitate reactions that are tolerant to a broad spectrum of (hetero)aryl substrates and functional groups, as demonstrated with 73 examples with up to 99% isolated yields. Notably, 97% Pd remained in the aqueous phase after 10 runs of catalyst recycling experiments, as determined via inductively coupled plasma-atomic emission spectrometry (ICP-AES) measurements, indicating highly efficient catalyst transfer. Furthermore, a continuous catalyst recycling approach has been successfully developed based on flow chemistry in combination with the catalyst shuttling behavior, allowing Suzuki-Miyaura couplings to be conducted at gram-scales with as little as 10 ppm Pd loading. Given the significance of transition-metal catalyzed cross-coupling and increasing interest in sustainable chemistry, this work is an important step towards the development of a responsive catalyst, in addition to having high activity, by tuning the structures of the ligands using polymer science.

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Awesome and Easy Science Experiments about 2-(5-Bromo-2-fluorobenzyl)benzo[b]thiophene

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Synthetic Route of 1034305-17-3, Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, and a compound is mentioned, 1034305-17-3, 2-(5-Bromo-2-fluorobenzyl)benzo[b]thiophene, introducing its new discovery.

Ni-Catalyzed Suzuki-Miyaura Cross-Coupling of alpha-Oxo-vinylsulfones to Prepare C-Aryl Glycals and Acyclic Vinyl Ethers

We demonstrate that readily available and bench-stable alpha-oxo-vinylsulfones are competent electrophiles in Ni-catalyzed Suzuki-Miyaura cross-coupling reactions. The C-sulfone bond in the alpha-oxo-vinylsulfone motif is cleaved chemoselectively in these reactions, furnishing C-aryl glycals or acyclic vinyl ethers in high yields. These reactions proceed under mild conditions and tolerate a remarkable scope of heterocycles and functional groups. Preliminary mechanistic studies revealed the importance of an alpha-heteroatom in facilitating these transformations.

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Awesome Chemistry Experiments For 6-Methoxy-2-(4-methoxyphenyl)-1-benzothiophene

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Description anti-mitotic agents which inhibit tubulin polymerization

Methoxy and ethoxy substituted 3-aroyl-2-arylbenzo[b]thiophenes and benzo[b]thiophene analogues are described for use in inhibiting tubulin polymerization. The compounds’ use for treating tumor cells is also described. Additional aspects described here are certain diaryl ether benzo[b]thiophene derivatives. Also described are particular analogs derived from dihydronaphthalene which have proven particularly effective. Certain new benzofuran analogs are described, as well as certain sulfur oxide benzo[b]thiophene analogs. Important compounds described herein include the first nitrogen-containing derivatives of combretastatin. These include nitro, amino and azide combrdtastatin derivatives.

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Some scientific research about 19301-35-0

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One-pot synthesis of 2-naphthols from nitrones and MBH adducts via decarboxylative N-O bond cleavage

The efficient synthesis of 2-naphthols is important for their further development as bioactive compounds and chiral ligands as well as other synthetic purposes. Herein, we describe the unprecedented one-pot synthesis of 2-naphthols through an acid-mediated decarboxylative N-O bond cleavage of bridged benzoxazepine intermediates, which were in turn generated from aryl nitrones and Morita-Baylis-Hillman (MBH) adducts under cationic rhodium(iii) catalysis. A range of 2-naphthol derivatives including anthracen-2-ol, phenanthren-2-ol, and 11H-benzo[b]fluoren-7-ol were formed with excellent site selectivities and functional group compatibilities. To gain mechanistic insight into this process, a series of mechanistic investigations and DFT calculations were also performed.

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Awesome Chemistry Experiments For 130-03-0

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One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, Application In Synthesis of Benzo[b]thiophen-3(2H)-one, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 130-03-0, Name is Benzo[b]thiophen-3(2H)-one, molecular formula is C8H6OS

A CONVENIENT GENERAL ACCESS TO alpha-SULFENYLATED ACETOPHENONES AND ALKANONES

Friedel-Crafts acylation of arenes with methylthio- (1) or phenylthio-acetyl chloride (2) provides ready access to alpha-methylthio- or alpha-phenylthio-substituted acetophenones.The acyl chlorides 1 and 2 reacted also with organoaluminium reagents to give alpha-sulfenylated alkanones.

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