Category: bromides-buliding-blocks

Armstrong, Megan K. published the artcileDiastereodivergent Reductive Cross Coupling of Alkynes through Tandem Catalysis: Z- and E-Selective Hydroarylation of Terminal Alkynes, Category: bromides-buliding-blocks, the publication is Journal of the American Chemical Society (2018), 140(32), 10233-10241, database is CAplus and MEDLINE.

A diastereodivergent hydroarylation of terminal alkynes is accomplished using tandem catalysis. The hydroarylation allows highly selective synthesis of both E and Z diastereoisomers of aryl alkenes, from the same set of starting materials, using the same combination of palladium and copper catalysts. The selectivity is controlled by simple changes in the stoichiometry of the alc. additive. The hydroarylation has excellent substrate scope and can be accomplished in the presence of various classes of compounds, including esters, nitriles, alkyl halides, epoxides, carbamates, acetals, ethers, silyl ethers, and thioethers. The Z-selective hydroarylation is accomplished using a new approach based on tandem Sonogashira coupling and catalytic semiredn. The E-selective hydroarylation involves an addnl. catalytic isomerization of the Z-alkene. Our explorations of the reaction mechanism explain the role of individual reaction components and how the subtle changes in the reaction conditions influence the rates of specific steps of the hydroarylation. Our studies also show that, although the Z- and E-selective hydroarylation reactions are mechanistically closely related, the roles of the palladium and copper catalysts in the two reactions are different.

Journal of the American Chemical Society published new progress about 81216-14-0. 81216-14-0 belongs to bromides-buliding-blocks, auxiliary class Linker,PROTAC Linker, name is 7-Bromohept-1-yne, and the molecular formula is C7H11Br, Category: bromides-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Lee, Mitchell T. published the artcileSynthesis of Isomerically Pure (Z)-Alkenes from Terminal Alkynes and Terminal Alkenes: Silver-Catalyzed Hydroalkylation of Alkynes, Application of 7-Bromohept-1-yne, the publication is Journal of the American Chemical Society (2019), 141(43), 17086-17091, database is CAplus and MEDLINE.

Here, an efficient synthesis of diastereopure Z-alkenes (Z:E > 300:1) through a silver-catalyzed hydroalkylation of terminal alkynes using alkylboranes as coupling partners is demonstrated. The exploration of the substrate scope, which reveals the broad functional group compatibility of the new method, is also described. Preliminary mechanistic studies suggest that a 1,2-metalate rearrangement of the silver borate intermediate is the key step responsible for the stereochem. outcome of the reaction.

Journal of the American Chemical Society published new progress about 81216-14-0. 81216-14-0 belongs to bromides-buliding-blocks, auxiliary class Linker,PROTAC Linker, name is 7-Bromohept-1-yne, and the molecular formula is C7H11Br, Application of 7-Bromohept-1-yne.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Predeus, Alexander V. published the artcileRational Synthesis for All All-Homocalixarenes, Quality Control of 111865-47-5, the publication is Angewandte Chemie, International Edition (2013), 52(3), 911-915, database is CAplus and MEDLINE.

The reaction of bis(carbene) complexes with bis(alkyne)s in a triple annulation provides direct access to homocalixarenes with three and four aromatic rings. Through proper choice of tether length, these macrocycles were assembled with ring sizes ranging from 15 to 56 carbon atoms. This method allows full control over the ring size and symmetry, and its ability to provide the synthesis of a series of all-homocalixarenes was illustrated for compounds having 2,3,5 and 11 methylene linkers between each ring. This method is also flexible enough to allow the incorporation of a pyrrole unit in place of one of the benzene rings in the calixarene. The macrocycles are always isolated as a single product and can be prepared conveniently on a gram scale. Six of the twelve homocalixarenes that were prepared were characterized by single-crystal x-ray anal.

Angewandte Chemie, International Edition published new progress about 111865-47-5. 111865-47-5 belongs to bromides-buliding-blocks, auxiliary class Benzenes, name is Mono(N,N,N-trimethyl-1-phenylmethanaminium) tribromide, and the molecular formula is C10H16Br3N, Quality Control of 111865-47-5.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Derince, Betul published the artcileArchitectural design of new conjugated systems carrying donor-π-acceptor groups (carbazole-CF₃): Characterizations, optical, photophysical properties and DSSC′s applications, SDS of cas: 111-83-1, the publication is Journal of Molecular Structure (2022), 1250(Part_2), 131689, database is CAplus.

In this study, two new organic dyes containing substituted N-octyl carbazole as electron donor and -CF₃ units as electron acceptor group were designed and synthesized for ZnO-based dye sensitized solar cells (DSSCs). The synthesized carbazole derivatized compounds 3,6-bis(3,5-bis(trifluoromethyl)phenyl)-9-octyl-9H-carbazole (IVa) and 3,6-bis(4-(trifluoromethyl)phenyl)-9-octyl-9H-carbazole (IVb) were characterized by FT-IR, ¹H NMR, ¹³C NMR, HMBC and CHN analyses. The spectroscopic (UV-Vis and FL) and thermal properties (TGA-DTA) of these compounds were also investigated. The produced (IVa and IVb) ZnO films were used as photoanodes in all DSSCs. Microwave-assisted hydrothermal method was used to synthesize ZnO nanopowders with different morphologies which are used as photoanodes in DSSCs. The structural and morphol. properties of ZnO nanopowders were investigated using X-ray diffraction (XRD) and field emission SEM (FESEM). ZnO-DSSCs were produced through coating ZnO nanopowders on transparent conductive fluorine-doped tin oxide (FTO) coated glass substrate using the Doctor Blade method. Current-voltage measurements of all produced DSSCs were carried out under a solar simulator with AM 1.5 G filter having an irradiance of 100 mW/cm². Solar cell performances of all DSSCs such as; open-circuit voltage (V_oc), short circuit current (J_sc), fill factor (FF) and power conversion efficiency (PCE) were analyzed.

Journal of Molecular Structure published new progress about 111-83-1. 111-83-1 belongs to bromides-buliding-blocks, auxiliary class Bromide,Aliphatic hydrocarbon chain, name is 1-Bromooctane, and the molecular formula is C8H17Br, SDS of cas: 111-83-1.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Luan, Yu-Yong published the artcileThree-Component Ruthenium-Catalyzed meta-C-H Alkylation of Phenol Derivatives, Synthetic Route of 401-55-8, the publication is Organic Letters (2022), 24(5), 1136-1140, database is CAplus and MEDLINE.

Herein, synthesis of phenyl-(pyrimidinyloxyphenyl)butanoates I [R¹ = H, Me, Cl, etc.; R² = H, Me, F, etc; R³ = Me, F; R⁴ = Ph, 4-FC₆H₄, 4-BrC₆H₄, etc.; R² = R³ = Me, F; R⁵ = OEt, piperidin-1-yl, N(n-Bu)₂] via three-component ruthenium catalyzed C-H alkylation of phenoxypyrimidines and vinylbenzene and ethyl-bromo-difluoroacetates/alkyl bromides was reported. This strategy exhibited good substrates suitability and functional group tolerance with various phenol derivatives, which provided a synthetic potential drug approach. Mechanistic studies showed that a radical process might be involved in this process. In addition, the meta alkylated phenol was obtained by further removal of the directing group.

Organic Letters published new progress about 401-55-8. 401-55-8 belongs to bromides-buliding-blocks, auxiliary class Fluoride,Bromide,Aliphatic hydrocarbon chain,Ester, name is Ethylbromofluoroacetate, and the molecular formula is C4H6BrFO2, Synthetic Route of 401-55-8.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Seath, Ciaran P. published the artcileTandem Chemoselective Suzuki-Miyaura Cross-Coupling Enabled by Nucleophile Speciation Control, Recommanded Product: (3-Bromo-5-methoxyphenyl)boronic acid, the publication is Angewandte Chemie, International Edition (2015), 54(34), 9976-9979, database is CAplus and MEDLINE.

Control of boronic acid speciation is presented as a strategy to achieve nucleophile chemoselectivity in the Suzuki-Miyaura reaction. Combined with simultaneous control of oxidative addition and transmetalation, this enables chemoselective formation of two C-C bonds in a single operation, providing a method for the rapid preparation of highly functionalized carbogenic frameworks.

Angewandte Chemie, International Edition published new progress about 849062-12-0. 849062-12-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Ether,Boronic Acids,Boronic acid and ester, name is (3-Bromo-5-methoxyphenyl)boronic acid, and the molecular formula is C8H15NO, Recommanded Product: (3-Bromo-5-methoxyphenyl)boronic acid.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Leitner, Christian published the artcileTotal synthesis of (±)-20S-hydroxy-1,2-dehydro-pseudoaspidospermidine via a C-H activation/transannular cyclization strategy, Quality Control of 69361-41-7, the publication is Chemical Communications (Cambridge, United Kingdom) (2017), 53(54), 7451-7453, database is CAplus and MEDLINE.

A total synthesis toward the pseudoaspidospermidine family via a C-H activation/transannular cyclization strategy has been accomplished. The applicability of this approach is showcased in the concise synthesis (ten steps) of (±)-20S-hydroxy-1,2-dehydro-pseudoaspidospermidine (I) starting from known dihydropyridone II. Via a joint synthetic sequence, we were also able to address the related iboga alkaloid (±)-isovelbanamine (III) in nine steps. Key features of this synthesis are a transannular cyclization to generate the pseudoaspidospermidine skeleton (C-H activation) and a Witkop photocyclization reaction providing a 9-membered lactam. It is also worth mentioning that the joint synthetic sequence can be carried out on a multigram scale.

Chemical Communications (Cambridge, United Kingdom) published new progress about 69361-41-7. 69361-41-7 belongs to bromides-buliding-blocks, auxiliary class PROTAC Linker,Aliphatic Linker, name is (4-Bromobut-1-yn-1-yl)trimethylsilane, and the molecular formula is C7H13BrSi, Quality Control of 69361-41-7.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Preston, Adam J. published the artcileSynthesis and Selected Reactions of a Bicyclic Sultam Having Sulfur at the Apex Position, Safety of Sodium 3-bromopropane-1-sulfonate, the publication is Journal of Organic Chemistry (2006), 71(17), 6573-6578, database is CAplus and MEDLINE.

A practical synthesis of the bicyclic dienyl sultam I has been developed. The viable route involved several key steps. Of these, ring-closing metathesis, represented by the conversion of II to III, had to be implemented in advance of the assembly of other rings such as is present in IV. The second double bond was best introduced by a bromination-dehydrobromination sequence, the 2-fold loss of HBr being achieved most reliably by the use of tetra-n-butylammonium fluoride in CH₂Cl₂ or DMSO. The direct irradiation of I gave rise to the endo-oriented cyclobutene derivative V. The title diene is not a ready participant in Diels-Alder reactions. When heated with endo-bornyltriazolinedione in Et acetate solution, conversion to a 1:1 mixture of VI and its diastereomer occurred as confirmed by X-ray crystallog. anal. From the mechanistic perspective, this transformation constitutes an interesting example of a stereocontrolled and regioselective [2+2] cycloaddition followed by a vinylcyclobutane-cyclohexene rearrangement. Products V and VI constitute examples of strained sulfonamides featuring a norbornyl-like structural component.

Journal of Organic Chemistry published new progress about 55788-44-8. 55788-44-8 belongs to bromides-buliding-blocks, auxiliary class Bromide,Salt,Aliphatic hydrocarbon chain,Aliphatic hydrocarbon chain, name is Sodium 3-bromopropane-1-sulfonate, and the molecular formula is C3H6BrNaO3S, Safety of Sodium 3-bromopropane-1-sulfonate.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Kulkarni, Bheemashankar A. published the artcileA solid-phase equivalent of van Leusen’s TosMIC, and its application in oxazole synthesis, Quality Control of 243455-57-4, the publication is Tetrahedron Letters (1999), 40(30), 5633-5636, database is CAplus.

Polystyrene-SH resin, prepared from Merrifield resin in two steps, was converted to polystyrene-SO₂-CH₂-NC in three steps. This resin functions as a solid-phase equivalent of p-tolylsulfonylmethyl isocyanide (TosMIC). Thus, reaction with aromatic aldehydes and tetrabutylammonium hydroxide as base yields 5-aryloxazoles.

Tetrahedron Letters published new progress about 243455-57-4. 243455-57-4 belongs to bromides-buliding-blocks, auxiliary class Oxazole,Bromide,Benzene, name is 5-(3-Bromophenyl)oxazole, and the molecular formula is C9H6BrNO, Quality Control of 243455-57-4.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary

Wilson, Claire M. published the artcileEnantiospecific sp²-sp³ Coupling of ortho- and para-Phenols with Secondary and Tertiary Boronic Esters, COA of Formula: C7H8BBrO3, the publication is Angewandte Chemie, International Edition (2017), 56(51), 16318-16322, database is CAplus and MEDLINE.

The coupling of ortho- and para-phenols with secondary and tertiary boronic esters has been explored. In the case of para-substituted phenols, after reaction of a dilithio phenolate species with a boronic ester, treatment with Ph₃BiF₂ or Martin’s sulfurane gave the coupled product with complete enantiospecificity. The methodol. was applied to the synthesis of the broad spectrum antibacterial natural product (-)-4-(1,5-dimethylhex-4-enyl)-2-methylphenol. For ortho-substituted phenols, initial incorporation of a benzotriazole on the phenol oxygen atom was required. Subsequent ortho-lithiation and borylation gave the coupled product, again with complete stereospecificity.

Angewandte Chemie, International Edition published new progress about 89694-44-0. 89694-44-0 belongs to bromides-buliding-blocks, auxiliary class Bromide,Boronic acid and ester,Benzene,Ether,Boronic Acids,Boronic acid and ester, name is 2-Bromo-5-methoxybenzene boronic acid, and the molecular formula is C19H14N2, COA of Formula: C7H8BBrO3.

Referemce:
https://en.wikipedia.org/wiki/Bromide,
bromide – Wiktionary