Category: bromides-buliding-blocks

《”Bulky-Yet-Flexible” α-Diimine Palladium-Catalyzed Reductive Heck Cross-Coupling: Highly Anti-Markovnikov-Selective Hydroarylation of Alkene in Air》 was published in Journal of Organic Chemistry in 2020. These research results belong to Yang, Xu-Wen; Li, Dong-Hui; Song, A-Xiang; Liu, Feng-Shou. Synthetic Route of C9H11Br The article mentions the following:

To pursue a highly regioselective and efficient reductive Heck reaction, a series of moisture- and air-stable α-diimine palladium precatalysts was rationally designed, readily synthesized, and fully characterized. The relationship between the structures of the palladium complexes and the catalytic properties was investigated. It was revealed that the “”bulky-yet-flexible”” palladium complexes allowed highly anti-Markovnikov-selective hydroarylation of alkenes with (hetero)aryl bromides under aerobic conditions. Further, synthetic application of the present protocol could provide rapid and straightforward access to functional and biol. active mols. In the experiment, the researchers used many compounds, for example, 1-Bromo-2-isopropylbenzene(cas: 7073-94-1Synthetic Route of C9H11Br)

1-Bromo-2-isopropylbenzene(cas: 7073-94-1) belongs to organobromine compounds. A variety of minor organobromine compounds are found in nature, but none are biosynthesized or required by mammals.Synthetic Route of C9H11Br Organobromine compounds have fallen under increased scrutiny for their environmental impact.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

《Green chemistry: efficient acetalization of aldehydes with alcohols using the acid red 52 photocatalyst》 was published in Environmental Chemistry Letters in 2020. These research results belong to Yu, Linyu; Lin, Chuyuan; Liao, Chunshu; Zeng, Xianghua; Chen, Xiuwen; Zhu, Zhongzhi; Huang, Yubing; Li, Yibiao; Chen, Lu. Quality Control of o-Bromobenzaldehyde The article mentions the following:

A sodium 4-[6-(diethylamino)-3-(diethyliminio)-3H-xanthen-9-yl]benzene-1,3-disulfonate (acid red 52) is used here as photocatalyst under yellow light irradiation A wide array of acyclic and cyclic acetals R1CH(OR2)2 (R1 = 4-fluorophenyl, 2-phenylethynyl, 3-methoxyphenyl, etc.; R2 = Et, methyl) and 2-(4-chlorophenyl)-1,3-dioxolane in 75-93% yields was obtained. Results show the efficient acetalization of aldehydes R1CHO with alcs. R2OH and ethylene glycol at room temperature, the use of abundant and sustainable alcs. as both the solvents and coupling agents, low catalyst loading, short reaction time, and readily available catalyst, which might be applied to green-catalyzed systems.o-Bromobenzaldehyde(cas: 6630-33-7Quality Control of o-Bromobenzaldehyde) was used in this study.

o-Bromobenzaldehyde(cas: 6630-33-7) is used in L-threonine aldolase-catalyzed enantio/diastereoselective aldol reactions.Quality Control of o-BromobenzaldehydeIt is a key starting material in the total synthesis of an anticancer agent, (-)-taxol.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

The author of 《Pd/C as Heterogeneous Catalyst for the Direct Arylation of (Poly)fluorobenzenes》 were Mao, Shuxin; Shi, Xinzhe; Soule, Jean-Francois; Doucet, Henri. And the article was published in Chemistry – A European Journal in 2019. Synthetic Route of C7H4BrF3 The author mentioned the following in the article:

The potential of the heterogeneous catalyst 10 % Pd/C in the direct arylation of (poly)fluorobenzene derivatives with aryl bromides has been investigated. In general, high yields of biaryl derivatives were obtained by using tri-, tetra-, and pentafluorobenzenes, whereas mono- and difluorobenzenes exhibited poor reactivity. The regioselectivities of the arylation reactions were similar to those observed with homogeneous palladium catalysts. Both electron-withdrawing and -donating substituents, such as nitrile, nitro, acetyl, ester, trifluoromethyl, tert-Bu, methoxy, or Me, on the aryl bromide were tolerated. Unexpectedly, tetrafluoro-substituted [1,1′-biphenyl]-4-ols were obtained from pentafluorobenzene at 150° due to a formal regioselective hydroxylation, whereas at lower temperatures the expected pentafluorobiphenyls were obtained. However, no C-F bond cleavage was observed with the other polyfluorobenzene derivatives These arylation reactions were carried out with only 1 mol % Pd/C as the catalyst and KOAc as an inexpensive base. Therefore, this protocol represents a very attractive access to (poly)fluoro-substituted biphenyls in terms of cost, simplicity, and sustainable chem. because the Pd/C catalyst can be easily removed at the end of the reaction, there is no contamination with phosphine ligand residues, and the major side-product of the reaction is KOAc.HBr. The experimental part of the paper was very detailed, including the reaction process of 1-Bromo-4-(trifluoromethyl)benzene(cas: 402-43-7Synthetic Route of C7H4BrF3)

1-Bromo-4-(trifluoromethyl)benzene(cas: 402-43-7) belongs to organobromine compounds.Most of the natural organobromine compounds are produced by marine organisms , and several brominated metabolites with antibacterial , antitumor , antiviral , and antifungal activity have been isolated from seaweed, sponges, corals, molluscs, and others. Synthetic Route of C7H4BrF3

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

The author of 《Pillar[5]arene-Based Resilient Supramolecular Gel with Dual-Stimuli Responses and Self-Healing Properties》 were Chen, Jin-Fa; Chen, Pangkuan. And the article was published in ACS Applied Polymer Materials in 2019. Application of 629-03-8 The author mentioned the following in the article:

Pillararene-based supramol. gels represent a new type of soft matter due to the dynamic assembly and promising applications in biomaterials. However, few examples of these gel materials were previously reported on their remarkable elasticity and self-healing properties. To address this issue, we herein demonstrated a novel pillar[5]arene-based fluorescent supramol. gel by using the two cooperative interactions. In our work, the host-guest complexation led first to the formation of a pillararene-based supramol., which was further polymerized with the monomer via UV initiation, resulting in strong cross-links for the gelation of this supramol. system. The dynamic host-guest recognition enabled a quick self-healing process of the gel. In addition, this supramol. gel also exhibits dual-stimuli responsive behaviors. We expect the current investigation to afford another avenue to robust bioinspired soft materials with macrocyclic functionality involved in the polymeric networks. In the part of experimental materials, we found many familiar compounds, such as 1,6-Dibromohexane(cas: 629-03-8Application of 629-03-8)

1,6-Dibromohexane(cas: 629-03-8) is generally used to introduce C6 spacer in the molecular architecture. Some of the examples are: synthesis of pyrrolo-tetrathiafulvalene molecular bridge (6PTTF6) to study redox switching behavior of single molecules; synthesis of water-soluble thermoresponsive polylactides.Application of 629-03-8

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

The author of 《A Photostable AIEgen for Specific and Real-time Monitoring of Lysosomal Processes》 were Zhang, Weijie; Zhou, Fan; Wang, Zhiming; Zhao, Zujin; Qin, Anjun; Tang, Ben Zhong. And the article was published in Chemistry – An Asian Journal in 2019. Application In Synthesis of 1,6-Dibromohexane The author mentioned the following in the article:

Lysosomes are recognized as advanced organelles involved in many cellular processes and are also considered as crucial regulators of cell homeostasis. The current strategies for monitoring activities of lysosomes exhibit some limitations. Herein, the authors synthesized a novel fluorescent probe named 2M-DPAS with AIE characteristics, which has significant advantages of good biocompatibility, high selectivity, bright emission and excellent photostability. Based on those, 2M-DPAS can be used to continuously monitor the dynamic changes of lysosomes, including autophagy and mitophagy, as well as to track the process of endocytosis of macromols. in lysosomes, which are of benefit to better know about the lysosomes-related diseases. The experimental process involved the reaction of 1,6-Dibromohexane(cas: 629-03-8Application In Synthesis of 1,6-Dibromohexane)

1,6-Dibromohexane(cas: 629-03-8) is generally used to introduce C6 spacer in the molecular architecture. Some of the examples are: synthesis of pyrrolo-tetrathiafulvalene molecular bridge (6PTTF6) to study redox switching behavior of single molecules; synthesis of water-soluble thermoresponsive polylactides.Application In Synthesis of 1,6-Dibromohexane

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2019,New Journal of Chemistry included an article by Zare, Abdolkarim; Kohzadian, Alireza; Abshirini, Zahra; Sajadikhah, Seyed Sajad; Phipps, Joshua; Benamara, Mourad; Beyzavi, M. Hassan. Product Details of 6630-33-7. The article was titled 《Nano-2-(dimethylamino)-N-(silica-n-propyl)-N,N-dimethylethanaminium chloride as a novel basic catalyst for the efficient synthesis of pyrido[2,3-d:6,5-d’]dipyrimidines》. The information in the text is summarized as follows:

This study describes the synthesis and characterization of nano-2-(dimethylamino)-N-(silica-n-propyl)-N,N-dimethylethanaminium chloride {nano-[DMSPDE][Cl]}, and its application as a highly effective, heterogeneous and recyclable basic catalyst for the promotion of a useful organic reaction. The catalyst was characterized using FTIR, SEM, TEM, TGA, XRD, Brunauer-Emmett-Teller (BET) and energy-dispersive x-ray spectroscopy (EDS) methods. The nanocatalyst was used to facilitate the solvent-free preparation of pyrido[2,3-d:6,5-d’]dipyrimidines by the multi-component reaction of 2-thiobarbituric acid, arylaldehydes and NH4OAc. Nano-[DMSPDE][Cl] furnished the products in high yields and in short reaction times, and showed no significant loss of activity after multiple runs. In the literature, pyrido[2,3-d:6,5-d’]dipyrimidines were synthesized using Lewis or acidic catalysts; however, a basic catalyst was applied for their preparation In the experiment, the researchers used many compounds, for example, o-Bromobenzaldehyde(cas: 6630-33-7Product Details of 6630-33-7)

o-Bromobenzaldehyde(cas: 6630-33-7) is used in L-threonine aldolase-catalyzed enantio/diastereoselective aldol reactions.Product Details of 6630-33-7Synthetic applications of o-Bromobenzaldehyde include: synthesis of aza-fused polycyclic quinolines through copper-catalyzed cascade reaction, preparation of 1-substituted indazoles by CuI-catalyzed coupling with N-aryl hydrazides.

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2019,Bioorganic Chemistry included an article by Karamitri, Angeliki; Sadek, Mirna S.; Journe, Anne-Sophie; Gbahou, Florence; Gerbier, Romain; Osman, Mai B.; Habib, Samy A. M.; Jockers, Ralf; Zlotos, Darius P.. Recommanded Product: 14660-52-7. The article was titled 《O-linked melatonin dimers as bivalent ligands targeting dimeric melatonin receptors》. The information in the text is summarized as follows:

A series of dimeric melatonin analogs 3a-e obtained by connecting two melatonin mols. through the methoxy oxygen atoms with spacers spanning 16-24 atoms and the agomelatine dimer 7 were synthesized and characterized in 2-[125-I]-iodomelatonin binding assays, bioluminescence resonance energy transfer (BRET) experiments, and in functional cAMP and β-arrestin recruitment assays at MT1 and MT2 receptors. The binding affinity of 3a-e generally increased with increasing linker length. Bivalent ligands 3a-e increased BRET signals of MT1 dimers up to 3-fold compared to the monomeric control ligand indicating the simultaneous binding of the two pharmacophores to dimeric receptors. Bivalent ligands 3c and 7 exhibited important changes in functional properties on the Gi/cAMP pathway but not on the β-arrestin pathway compared to their monomeric counterparts. Interestingly, 3c (20 atoms spacer) shows inverse agonistic properties at MT2 on the Gi/cAMP pathway. In conclusion, these findings indicate that O-linked melatonin dimers are promising tools to develop signaling pathway-based bivalent melatonin receptor ligands. The experimental process involved the reaction of Ethyl 5-bromovalerate(cas: 14660-52-7Recommanded Product: 14660-52-7)

Ethyl 5-bromovalerate(cas: 14660-52-7) belongs to bromides. A variety of minor organobromine compounds are found in nature, but none are biosynthesized or required by mammals. Organobromine compounds have fallen under increased scrutiny for their environmental impact.Recommanded Product: 14660-52-7

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2019,Monatshefte fuer Chemie included an article by Anschuber, Martin; Pollice, Robert; Schnuerch, Michael. Electric Literature of C6H11BrO2. The article was titled 《Rhodium-catalyzed direct alkylation of benzylic amines using alkyl bromides》. The information in the text is summarized as follows:

The development and substrate scope evaluation of a direct alkylation protocol of the C(sp3)-H bond of benzylic amines using alkyl bromides was reported. This pyridine-directed method was initiated by elimination of the alkyl bromide to a terminal olefin, which was then the true alkylating agent. In the experiment, the researchers used many compounds, for example, Ethyl 4-bromobutyrate(cas: 2969-81-5Electric Literature of C6H11BrO2)

Ethyl 4-bromobutyrate(cas: 2969-81-5) belongs to bromides. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. Bromine is more electronegative than carbon (2.9 vs 2.5). Consequently, the carbon in a carbon–bromine bond is electrophilic, i.e. alkyl bromides are alkylating agents.Electric Literature of C6H11BrO2

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2019,Organic & Biomolecular Chemistry included an article by Sun, Wan; Chen, Chen; Qi, Yuan; Zhao, Jinghui; Bao, Yinwei; Zhu, Bolin. Recommanded Product: Methyltriphenylphosphonium bromide. The article was titled 《Palladium-catalyzed cascade reactions of alkene-tethered carbamoyl chlorides with N-tosyl hydrazones: synthesis of alkene-functionalized oxindoles》. The information in the text is summarized as follows:

A palladium-catalyzed cascade reaction of alkene-tethered carbamoyl chlorides 4-R-5-R1-6-R2-2-R3C(=CH2)C6HN(R4)C(O)Cl (R = H, CH3, t-Bu, OCH3, 4-F, 4-Cl, 4-NO2; R2 = H, CH3; R1R2 = -CH=CHCH=CH-; R3 = CH3, C6H5, 4-FC6H4, 4-ClC6H4, 2-FC6H4; R4 = benzyl, p-methoxybenzyl, cyclopentyl) with N-tosyl hydrazones R5HC=NNHTs (R5 = C6H5, naphthalen-1-yl, thiophen-2-yl, etc.) is described. It provided a new way to synthesize various alkene-functionalized oxindoles I bearing an all-carbon quaternary center. The olefin moieties could serve as versatile handles for further elaboration. This transformation was highly efficient and showed good functional group tolerance. After reading the article, we found that the author used Methyltriphenylphosphonium bromide(cas: 1779-49-3Recommanded Product: Methyltriphenylphosphonium bromide)

Methyltriphenylphosphonium bromide(cas: 1779-49-3) is used for methylenation through the Wittig reaction. It is utilized in the synthesis of an enyne and 9-isopropenyl -phenanthrene by using sodium amide as reagent. Recommanded Product: Methyltriphenylphosphonium bromide

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

In 2018,Bioconjugate Chemistry included an article by Veerapen, Natacha; Kharkwal, Shalu Sharma; Jervis, Peter; Bhowruth, Veemal; Besra, Amareeta K.; North, Simon J.; Haslam, Stuart M.; Dell, Anne; Hobrath, Judith; Quaid, Padraic J.; Moynihan, Patrick J.; Cox, Liam R.; Kharkwal, Himanshu; Zauderer, Maurice; Besra, Gurdyal S.; Porcelli, Steven A.. HPLC of Formula: 17696-11-6. The article was titled 《Photoactivable Glycolipid Antigens Generate Stable Conjugates with CD1d for Invariant Natural Killer T Cell Activation》. The information in the text is summarized as follows:

Activation of invariant natural killer T lymphocytes (iNKT cells) by α-galactosylceramide (α-GC) elicits a range of pro-inflammatory or anti-inflammatory immune responses. We report the synthesis and characterization of a series of α-GC analogs with acyl chains of varying length and a terminal benzophenone. These bound efficiently to the glycolipid antigen presenting protein CD1d, and upon photoactivation formed stable CD1d-glycolipid covalent conjugates. Conjugates of benzophenone α-GCs with soluble or cell-bound CD1d proteins retained potent iNKT cell activating properties, with biol. effects that were modulated by acyl chain length and the resulting affinities of conjugates for iNKT cell antigen receptors. Anal. by mass spectrometry identified a unique covalent attachment site for the glycolipid ligands in the hydrophobic ligand binding pocket of CD1d. The creation of covalent conjugates of CD1d with α-GC provides a new tool for probing the biol. of glycolipid antigen presentation, as well as opportunities for developing effective immunotherapeutics. In the experiment, the researchers used many compounds, for example, 8-Bromooctanoic acid(cas: 17696-11-6HPLC of Formula: 17696-11-6)

8-Bromooctanoic acid(cas: 17696-11-6) acid is used in the synthesis of 8-(N-Methyl-4,4′-bipyridinyl)- octanoic acid. 8-Mercaptooctanoic acid was prepared from 8-bromooctanoic acid.HPLC of Formula: 17696-11-6

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary