Category: bromides-buliding-blocks

Mechanochemical synthesis of magnesium-based carbon nucleophiles in air and their use in organic synthesis was written by Takahashi, Rina;Hu, Anqi;Gao, Pan;Gao, Yunpeng;Pang, Yadong;Seo, Tamae;Jiang, Julong;Maeda, Satoshi;Takaya, Hikaru;Kubota, Koji;Ito, Hajime. And the article was included in Nature Communications in 2021.Recommanded Product: 1-Bromo-4-methoxybutane This article mentions the following:

Since the discovery of Grignard reagents in 1900, the nucleophilic addition of magnesium-based carbon nucleophiles to various electrophiles has become one of the most powerful, versatile, and well-established methods for the formation of carbon-carbon bonds in organic synthesis. Grignard reagents are typically prepared via reactions between organic halides and magnesium metal in a solvent. However, this method usually requires the use of dry organic solvents, long reaction times, strict control of the reaction temperature, and inert-gas-line techniques. Despite the utility of Grignard reagents, these requirements still represent major drawbacks from both an environmental and an economic perspective, and often cause reproducibility problems. Herein, the general mechanochem. synthesis of magnesium-based carbon nucleophiles (Grignard reagents in paste form) in air using a ball milling technique is reported. These nucleophiles can be used directly for one-pot nucleophilic addition reactions with various electrophiles and nickel-catalyzed cross-coupling reactions under solvent-free conditions. In the experiment, the researchers used many compounds, for example, 1-Bromo-4-methoxybutane (cas: 4457-67-4Recommanded Product: 1-Bromo-4-methoxybutane).

1-Bromo-4-methoxybutane (cas: 4457-67-4) belongs to organobromine compounds. 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. One prominent application of synthetic organobromine compounds is the use of polybrominated diphenyl ethers as fire-retardants, and in fact fire-retardant manufacture is currently the major industrial use of the element bromine.Recommanded Product: 1-Bromo-4-methoxybutane

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Palladium-Catalyzed Regioselective Synthesis of 1-Hydroxycarbazoles Under Aerobic Conditions was written by Youn, So Won;Kim, Young Ho;Jo, Yoon Hyung. And the article was included in Advanced Synthesis & Catalysis in 2019.Recommanded Product: 35065-86-2 This article mentions the following:

A palladium-catalyzed aerobic C-H amidation of N-Ts-2-amino-3′-hydroxylbiaryls was developed to afford a diverse range of 1-hydroxycarbazoles with high regioselectivity and efficiency. This protocol benefits from operational simplicity, robustness, and sustainability using ambient air as the sole terminal oxidant. Further elaboration of the products obtained from this process provides facile access to various carbazole alkaloids including carbazolequinones and biscarbazoles. A mechanism involving dual directing group-assisted regioselective C-H activation at the more sterically hindered C2′-position of 2-amino-3′-hydroxylbiaryls is proposed. In the experiment, the researchers used many compounds, for example, 3-Bromophenyl acetate (cas: 35065-86-2Recommanded Product: 35065-86-2).

3-Bromophenyl acetate (cas: 35065-86-2) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon–bromine bond is electrophilic in nature. In the pharmaceutical industry organo bromine derivatives are used as sedatives, vasodilators, antiseptic agents, and anticancer agents.Recommanded Product: 35065-86-2

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Towards a novel explanation of Pseudomonas cepacia lipase enantioselectivity via molecular modelling of the enantiomer trajectory into the active site was written by Guieysse, David;Salagnad, Christophe;Monsan, Pierre;Remaud-Simeon, Magali;Tran, Vinh. And the article was included in Tetrahedron: Asymmetry in 2003.Quality Control of Ethyl (2-bromophenyl)acetate This article mentions the following:

In the transesterification reaction between (RS)-2-bromophenyl acetic acid Et ester and 1-octanol in n-octane, Pseudomonas cepacia lipase enantioselectivity towards the (R)-isomer is 57. Two strategies are described to investigate the structural basis involved in this enzyme enantioselectivity. Mol. modeling of the tetrahedral intermediate mimicking the transition state enables the identification of two potentially productive substrate-binding modes for each enantiomer. However, the conformations obtained with the faster and slower-reacting enantiomers have equivalent potential energies and most of them possess the hydrogen bonds essential for catalysis. On this basis, it is not possible to distinguish the diastereomeric complexes. The second approach is original and consists in a simple but robust protocol of pseudomol. dynamics simulations under constraints to map the probable trajectory of the enantiomers in the active site. Enzyme/substrate interaction energy is always found to be lower for the faster-reacting enantiomer, which satisfactorily corroborates the exptl. results. Energy differences are attributed to specific interactions of these substrates with a network of hydrophobic residues lining the access path. Furthermore, mechanistic details suggest that the pivoting side chains of the hydrophobic residues act in a concerted step-tooth gear motion whose basic role is to select and guide the substrates towards the active site. With this type of lipase, such dynamic features could be the key explanation of this as yet unexplored enantiorecognition. For the slower-reacting enantiomer, it appears that the concerted motion of the side chains is perturbed when the substrate passes through a bottleneck formed by Val266 and Leu17. The enantioselectivity of mutant Val266Leu with a more bulky side chain at this position supports our assumption: by narrowing the bottleneck, the enantioselectivity was considerably enhanced as much as up to 200. In the experiment, the researchers used many compounds, for example, Ethyl (2-bromophenyl)acetate (cas: 2178-24-7Quality Control of Ethyl (2-bromophenyl)acetate).

Ethyl (2-bromophenyl)acetate (cas: 2178-24-7) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. alpha-Bromoesters are employed in the Reformatsky reaction for the synthesis of beta-hydroxyesters. One prominent application of synthetic organobromine compounds is the use of polybrominated diphenyl ethers as fire-retardants, and in fact fire-retardant manufacture is currently the major industrial use of the element bromine.Quality Control of Ethyl (2-bromophenyl)acetate

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Synthesis of saturated fatty acids ¹¹C(¹³C)-labeled in the ω-methyl position was written by Neu, Henrik;Kihlberg, Tor;Laangstroem, Bengt. And the article was included in Journal of Labelled Compounds & Radiopharmaceuticals in 1997.Synthetic Route of C15H29BrO2 This article mentions the following:

A method for the preparation of ω-labeled saturated fatty acids ¹¹C(¹³C)H₃(CH₂)_nCO₂H (n = 1,2,3,,6,10,14) is described. A highly reactive zerovalent copper complex was prepared from lithium naphthalenide reduced lithium(2-thienyl)iodocuprate. The labeling precursors were obtained by addition of tert-Bu ω-iodocarboxylates to the organocuprate and these were reacted with [¹¹C]methyl iodide to form ¹¹C-labeled, protected intermediates. The tert-Bu ester protecting group was rapidly removed with trifluoroacetic acid, affording fatty acids ¹¹C-labeled in the ω-Me position. A solid phase extraction method was developed and preceded final HPLC purification In a typical run starting with 2.75 GBq of [¹¹C]methyl iodide, 375 MBq (66%) [16-¹¹C]palmitic acid was obtained within 46 min from the end of radionuclide production In the experiment, the researchers used many compounds, for example, 15-Bromopentadecanoic acid (cas: 56523-59-2Synthetic Route of C15H29BrO2).

15-Bromopentadecanoic acid (cas: 56523-59-2) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. alpha-Bromoesters are employed in the Reformatsky reaction for the synthesis of beta-hydroxyesters. Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Synthetic Route of C15H29BrO2

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

A Concise and Scalable Strategy for the Total Synthesis of Dictyodendrin B Based on Sequential C-H Functionalization was written by Pitts, Andrew K.;O’Hara, Fionn;Snell, Robert H.;Gaunt, Matthew J.. And the article was included in Angewandte Chemie, International Edition in 2015.Electric Literature of C9H11BrO This article mentions the following:

A sequential C-H functionalization strategy for the synthesis of the marine alkaloid dictyodendrin B (I.NH₃) is reported. Our synthesis begins from com. available 4-bromoindole and involves six direct functionalizations around the heteroarene core as part of a gram-scale strategy towards the natural product. In the experiment, the researchers used many compounds, for example, 1-(2-Bromoethyl)-4-methoxybenzene (cas: 14425-64-0Electric Literature of C9H11BrO).

1-(2-Bromoethyl)-4-methoxybenzene (cas: 14425-64-0) belongs to organobromine compounds. Many of the organo bromine compounds are relatively nonpolar. Bromine is more electronegative than carbon (2.8 vs 2.5) and hence the carbon in a carbon–bromine bond is electrophilic in nature. Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Electric Literature of C9H11BrO

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Synthesis of symmetrical bromo-1,3,5-triphenylbenzenes was written by Cheng, Ge;Gan, Qiu;Wang, Yuechuan;Xie, Minggui. And the article was included in Huaxue Shijie in 2000.Recommanded Product: 3,3”-Dibromo-5′-(3-bromophenyl)-1,1′:3′,1”-terphenyl This article mentions the following:

1,3,5-Tri(3-bromophenyl)benzene and 1,3,5-tri(3,5-dibromophenyl)benzene were synthesized from m-bromoacetophenone and 3,5-dibromoacetophenone, resp., in the presence of SiCl₄ in ethanol. The yield of 1,3,5-tri(3-bromophenyl)benzene was 74%, and that of 1,3,5-tri(3,5-dibromophenyl)benzene was 40%. The products were identified by UV, MS, IR, and ¹H NMR. The yields can be improved by increasing the amount of SiCl₄ or decreasing that of ethanol. In the experiment, the researchers used many compounds, for example, 3,3”-Dibromo-5′-(3-bromophenyl)-1,1′:3′,1”-terphenyl (cas: 96761-85-2Recommanded Product: 3,3”-Dibromo-5′-(3-bromophenyl)-1,1′:3′,1”-terphenyl).

3,3”-Dibromo-5′-(3-bromophenyl)-1,1′:3′,1”-terphenyl (cas: 96761-85-2) belongs to organobromine compounds. Bromo compounds are employed in a variety of metal-catalyzed coupling reactions. They are also ideal candidates for the synthesis of Grignard reagents that have wide-applicability in organic synthesis. alpha-Bromoesters are employed in the Reformatsky reaction for the synthesis of beta-hydroxyesters. When the molecular ion is detected, the bromine and chlorine isotope patterns are very distinct, but caution is to be exercised for certain mixed chlorinated/brominated compounds, which can look similar to homohalogen patterns.Recommanded Product: 3,3”-Dibromo-5′-(3-bromophenyl)-1,1′:3′,1”-terphenyl

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

An Efficient Synthesis of Substituted meta-Halophenols and Their Methyl Ethers: Insight into the Reaction Mechanism was written by Khan, Faiz Ahmed;Choudhury, Sumit. And the article was included in European Journal of Organic Chemistry in 2010.Computed Properties of C8H7BrO3 This article mentions the following:

An expeditious synthetic methodol. leading to substituted meta-halophenols and their corresponding Me ether derivatives through acid-mediated fragmentation of suitably substituted dihalonorbornyl ketones has been devised. The reaction sequence consists of TBTH-mediated (TBTH is tri-n-butyltin hydride) selective bridgehead halogen reduction of easily accessible Diels-Alder adducts derived from 1,2,3,4-tetrahalo-5,5-dimethoxycyclopentadiene and β-substituted vinyl acetates, with subsequent conversion into the requisite bicyclic ketones by a two-step hydrolysis/oxidation approach. An extensive mechanistic investigation based on isotope labeling and cross experiments has been carried out and plausible mechanistic pathways based on these results have been proposed. The absence of halogen atoms at the bridgehead positions steers the reaction through a novel pathway involving the incorporation of proton (or deuterium) followed by elimination of HX (or DX), so the described methodol. also provides a reliable route to ortho-para dideuteratedphenolic derivatives In the experiment, the researchers used many compounds, for example, Methyl 3-bromo-5-hydroxybenzoate (cas: 192810-12-1Computed Properties of C8H7BrO3).

Methyl 3-bromo-5-hydroxybenzoate (cas: 192810-12-1) belongs to organobromine compounds. Organo bromine compounds are versatile compounds and are widely used in diverse fields. Organo bromine derivatives are used in the dye sector, as an indicator in analytical chemistry (Bromothymol blue is a popular indicator). One prominent application of synthetic organobromine compounds is the use of polybrominated diphenyl ethers as fire-retardants, and in fact fire-retardant manufacture is currently the major industrial use of the element bromine.Computed Properties of C8H7BrO3

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

8-Aminoquinolines as anticoccidials – I was written by Armer, Richard E.;Barlow, Jacqueline S.;Dutton, Christopher J.;Greenway, David H. J.;Greenwood, Sean D. W.;Lad, Nita;Tommasini, Ivan. And the article was included in Bioorganic & Medicinal Chemistry Letters in 1997.Name: N-(5-Bromopentyl)phthalimide This article mentions the following:

The proposed ring metabolites of the 8-aminoquinoline antimalarial, pentaquine, I, have been synthesized and their biol. activity as anticoccidial agents investigated in vivo. Several analogs in which this metabolic pathway had been blocked were also synthesized and their anticoccidial activity measured. In the experiment, the researchers used many compounds, for example, N-(5-Bromopentyl)phthalimide (cas: 954-81-4Name: N-(5-Bromopentyl)phthalimide).

N-(5-Bromopentyl)phthalimide (cas: 954-81-4) belongs to organobromine compounds. Organo bromine compounds are versatile compounds and are widely used in diverse fields. Organo bromine derivatives are used in the dye sector, as an indicator in analytical chemistry (Bromothymol blue is a popular indicator). Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Name: N-(5-Bromopentyl)phthalimide

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Visible-Light-Mediated (sp³)Cα-H Functionalization of Ethers Enabled by Electron Donor-Acceptor Complex was written by Roy, Sourav;Chatterjee, Indranil. And the article was included in ACS Organic & Inorganic Au in 2022.Recommanded Product: 128-08-5 This article mentions the following:

A synthetically beneficial visible-light-mediated protocol has been disclosed to achieve C-H amination of readily available feedstocks cyclic and acyclic ethers. A rarely identified N-bromosuccinamide-tetrahydrofuran electron donor-acceptor complex served as an initiator to functionalize both α-diazoketones and dialkyl azodicarboxylates. This developed methodol. gives an alternative and milder way to construct the C-N bond and can be explored for the formation of C-C bond to perform arylation and allylation reactions. In the experiment, the researchers used many compounds, for example, 1-Bromopyrrolidine-2,5-dione (cas: 128-08-5Recommanded Product: 128-08-5).

1-Bromopyrrolidine-2,5-dione (cas: 128-08-5) belongs to organobromine compounds. Most organobromine compounds, like most organohalide compounds, are relatively nonpolar. Commercially available organobromine pharmaceuticals include the vasodilator nicergoline, the sedative brotizolam, the anticancer agent pipobroman, and the antiseptic merbromin. Recommanded Product: 128-08-5

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary

Synthesis of arylpropylamines. I. From allyl chloride was written by Patrick, T. M. Jr.;McBee, E. T.;Hass, H. B.. And the article was included in Journal of the American Chemical Society in 1946.Quality Control of 2-(2-Bromophenyl)propan-2-amine This article mentions the following:

New compounds possessing potential pressor activity have been prepared PhCl (450 g.) and 32.4 g. anhydrous FeCl₃ at -21°, treated dropwise with 76.5 g. CH₂:CHCH₂Cl during 2 h. with stirring for an addnl. 3 h. (temperature rise to -16°), the mixture shaken with 1 kg. crushed ice and 100 mL. concentrated HCl, and the residue from the organic layer dried and distilled, give 21% of 2-chloro-1-(p-chlorophenyl)propane, b₁₀ 111-12°, d₂₀²⁰ 1.1678, n_D²⁰ 1.5360 (all d. and n at 20° in Na_D light), and 32% of the o-chlorophenyl isomer, b₁₀ 103°, d. 1.1706, n 1.1706; there also result 9 g. MeCHClCH₂Cl, 12 g. CH₂(CH₂Cl)₂, and 10-12% of bis(chlorophenyl)propanes. 1-(p-Bromophenyl)-2-chloropropane, b₁₀ 124-6°, d. 1.4100, n 1.5582, 13%; o-bromophenyl isomer, b₁₀ 115-17°, d. 1.4159, n 1.5568, 31%. 2-Chloro-1-(p-fluorophenyl)propane, b₁₀ 81°, d. 1.1186, n 1.4971, 24%. 2-Chloro-1-(p-methoxyphenyl)propane, b₅ 107°, d. 1.0891, n 1.5270, 14%. The method of Truffault (C.A. 33, 2886.6), in which 380 g. H₂SO₄ (10 % oleum) and 337.5 g. PhCl were treated with 153 g. CH₂:CHCH₂Cl during 2 h., gives 6% of p-ClC₆H₄CHMeCH₂Cl, b₅ 94°, and 7.5% of an isomer (?), b₅ 90.5-2°, d. 1.1801, n 1.5405; PhOMe and PhOEt do not react under these conditions. Ammonolysis was carried out in an autoclave at 125-160° for 4-9 h.; EtOH solutions give somewhat better yields and mixtures containing, fewer byproducts; the NH₃ solution contained 125 g./l.; the MeNH₂ solution, 204 g./l. 2-(p-Chlorophenyl)propylamine, b₅ 99-101°, d. 0.9639, n 1.5398, 40% (picrate, m. 205°). 2-(p-Chlorophenyl)isopropylamine, b₅ 93-4°, d. 1.0762, n 1.5343, 44% (HCl salt, m. 164-5°). 2-(p-Bromophenyl)isopropylamine, b₁₀ 123-4°, d. 1.3080, n 1.5569, 35% (HCl salt, m. 204-6°); o-bromophenyl isomer, b₁₀ 118°, d. 1.2984, n 1.5582, 26% (HCl salt, m. 200-1°). N-Methyl-2-phenylpropylamine, b₁₅, 95-6° d. 0.9178, n 1.5102, 62% (picrate, m. 155°). N-Methyl-2-(o-chlorophenyl)isopropylamine, b₁₀ 110°, d. 1.0536, n 1.5288, 24% (picrate, m. 156°); p-chlorophenyl isomer, b₁₀ 114-15°, d. 1.0442, n 1.5259, 35% (picrate, m. 103°). N-Methyl-2-(p-fluorophenyl)isopropylamine, b₁₀ 87-9°, d. 0.9984, n 1.4922, 41% (picrate, m. 125°). In the experiment, the researchers used many compounds, for example, 2-(2-Bromophenyl)propan-2-amine (cas: 173026-23-8Quality Control of 2-(2-Bromophenyl)propan-2-amine).

2-(2-Bromophenyl)propan-2-amine (cas: 173026-23-8) belongs to organobromine compounds. 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. One prominent application of synthetic organobromine compounds is the use of polybrominated diphenyl ethers as fire-retardants, and in fact fire-retardant manufacture is currently the major industrial use of the element bromine.Quality Control of 2-(2-Bromophenyl)propan-2-amine

Referemce:
Bromide – Wikipedia,
bromide – Wiktionary