Category: esters-buliding-blocks

Roe, Arthur published the artcileThe preparation of some fluoro- and trifluoromethylphenothiazines, and some observations regarding determination of their structure by infrared spectroscopy, Application of Ethyl 3,5-difluorobenzoate, the publication is Journal of Organic Chemistry (1955), 1577-90, database is CAplus.

A number of fluorophenothiazines which may be of interest as antioxidants in lubricating oils are prepared Adding slowly with stirring 16 g. Br in 25 cc. AcOH to 12.9 g. 2,4-F₂C₆H₃NH₂ in 75 cc. AcOH at 25°, removing after 0.5 hr. any excess Br with Na₂S₂O₃, then adding 11.2 g. NaOAc in 100 cc. H₂O, and cooling the mixture in an ice bath give 81% 2,4,6-F₂BrC₆H₂NH₂ (I), m. 41-2°. I has a high vapor pressure [N-Ac derivative (II), 90%, prepared with Ac₂O, m. 156-7°]. 2,4-F₂C₆H₃NHAc cannot be brominated in AcOH. Deamination of I with H₃PO₂ gives 74% 3,5-F₂C₆H₃Br (III), b. 140°, d₂₃ 1.676, n_D²³ 1.4989. Adding a Grignard reagent of 14.5 g. III and 1.9 g. Mg in 50 cc. Et₂O to Dry Ice in Et₂O gives 64% 3,5-F₂C₆H₃CO₂H, m. 121-2°, also obtained when 18 g. 3,5-(H₂N)₂C₆H₃CO₂Et in 480 g. 45% HBF₄ is treated at -10° with 15 g. NaNO₂, the bis(diazonium fluoborate) (40 g., decomposing about 175°) is decomposed at 30 mm., and the Et ester, b₄₆ 103-5°, b₇₆₀ 200°, n_D²⁵ 1.4670, d₂₅ 1.201, saponified with KOH. Stirring 23 g. 2,6-ClFC₆H₃CO₂H in 100 cc. concentrated H₂SO₂4 1 hr. at 60°, adding (1.5 hrs.) 10 g. NaN₃ in small portions at 65°, keeping the mixture overnight, making it basic with NH₄OH, and steam distilling it give 70% 2,6-ClFC₆H₃NH₂ (IV), b₃₀ 91°, n_D²³ 1.5511, d₂₃ 1.316 (Ac derivative, prepared in 71% yield by refluxing 6 g. IV 1.5 hrs. in 25 cc. AcOH and 4.2 g. Ac₂O, platelets, m. 134-5°). Adding 9.1 g. NaNO₂ in small portions to 24 g. 2,3-O₂N(H₂N)C₆H₃CF₃ in 300 cc. 50% H₂SO₄ at 0°, stirring the mixture 15 min., pouring it into 160 cc. 10% CuCl at 20°, keeping it 1 hr. at 20°, diluting it with 100 cc. H₂0, and steam distilling it give 52% 3-Cl analog, b₂₇ 125-6°, n_D²⁴ 1.4782, d₂₄ 1.531. 3,4-Cl(O₂N)C₆H₃CF₃, prepared in the same way in 53% yield, b₂₈ 116°, n_D²⁴ 1.4864, d₂₄ 1.527. Refluxing 17 hrs. 0.1 mole of the appropriate acetanilide, 0.2 mole PhBr, 0.1 mole anhydrous K₂CO₃, 20 cc. PhNO₂, 6 g. catalyst mixture (consisting of equal parts by weight of CuI, KI, and Cu powder), and a crystal of iodine, steam distilling the mixture, extracting the distillation residue with Et₂O, refluxing the Et₂O residue 3.5 hrs. in 100 cc. 20% alc. KOH, pouring the solution into 800 cc. saturated NaCl solution, and extracting with Et₂O give the fluorodiphenylamine of which the following are prepared: 2-F (V), 80%, yellow oil, b₃ 111.5°, d₂₃ 1.165, n_D²³ 1.6171 (N-Bz derivative, m. 129-30°); 3-F (VI), 56%, yellow oil, b₁₀ 149-50°, d₂₃ 1.176, n_D²³ 1.6203; 2,5-di-F (VII), 68%, b₉ 138°, m. 45-5.5°; 2,4-di-F (VIIa), 63%, b₃ 110-13°, m. 42-2.5°; 3,5-di-F (VIII), 51%, b₄ 121-4°, m. 45-5.5°; 2,3′,5-tri-F, 63%, b_2.5 105-6°, m. 31.5-2°; 2,4′,5-tri-F, 71%, b_2.5 104-5°, m. 39.2-40°; 3,3′,5-tri-F (VIIIa), 49%, b_3.5 121°, m. 27.5-8.5°; 3,4′,5-tri-F (IX), 65%, b₄ 127-8°, m. 60-1°; 3,3′,5,5′-tetra-F (X), 43%, m. 117-18°; 2,6-ClF (XI), 34%, b₄ 138-40°, m. 69-9.3°. Adding 4 g. NaOH in 30 cc. H₂O to 12.5 g. o-H₂NC₆H₄SH in 300 cc. absolute EtOH, then adding 0.1 mole of the appropriate halonitrobenzene in 100 cc. absolute EtOH, refluxing the mixture 0.5 hr. (3.5 hrs. in the preparation of XIII below), adding 100 cc. H₂O to the boiling filtered solution, and cooling it slowly give the substituted o-H₂NC₆H₄SC₆H₃RNO₂-x,2 (XII) of which the following are prepared: R = 3-CF₃(XIII), 67%, m. 72-3°; 4-CF₃ (XIV), 89%, yellow, m. 108-9°; 5-CF₃, 80%, yellow, m. 110-11°; 4-F, 70%, red, m. 73-4°; 5-F, 54%, yellow, m. 115-16.5°. Refluxing XII with 10 times its weight of 90% HCO₂H 9-10 hrs. gives the substituted N-formyl derivative, o-OHCNHC₆H₄SC₆H₃RNO₂-x,2, of which the following are prepared: x-R = 3-CF₃ (XV), 92%,m. 137-8°; 4-CF₃(XVI), 88%, yellow, m. 132-3°; 5-CF₃ (XVII), 83%, yellow, m. 95-6°; 4-F (XVIII), 74%, yellow, m. 128-9°; 5-F (XIX), 74%, yellow, m. 116-17°. Refluxing 6.3 g. XIV 1 hr. with 2.8 g. BzCl in 25 cc. C₅H₅N gives 89% 2-[4,2-CF₃(O₂N)C₆H₃S]C₆H₄NHBz (XX), m. 127.5-8°. Heating 15 g. V, 5 g. S, and a few crystals of iodine 3 hrs. at 200-10° under reflux, boiling the tar obtained with 20% Na₂S (to remove the excess S), extracting it with Et₂O, treating the Et₂O solution with Norit and Zn dust, and distilling the residue of the filtered Et₂O solution give 2.2 g. unchanged V and 3 g. of a yellow solid, b_2.5 140°, from which 9.3% 1-fluorophenothiazine (XXI), m. 81.5-2°, and 1.4% phenothiazine (XXII), m. 180-2°, are isolated. XXI gives a blood-red color with concentrated HNO₃. When 1.9 g. V, 0.6 g. S, and a crystal of iodine are heated 1.5 hrs. in a sealed tube at 310-40° a few mg. XXI and 0.175 g. XXII are obtained. When 2.2 g. XI, 0.6 g. S, and a crystal of iodine are heated 1.5 hrs. at 300°, no crystalline product can be isolated. Heating 5 g. VI, 1.7 g. S, and a few crystals of iodine 1 hr. at 180° ± 5° gives 52% 2-fluorophenothiazine (XXIII), light yellow powder, m. 199° (decomposition); it gives a blood-red color with HNO₃. In an attempted synthesis of 1,4-difluorophenothiazine (XXIV), XXIII is obtained. Several other attempts to prepare XXIV from VII, from VIIa, or 1,3-difluorophenothiazine also failed. Heating a carefully purified VIII with S and a crystal of iodine 35 min. at 175° gives 43% 2,4-difluorophenothiazine, subliming 130°/2.5 mm., m. 129-30°. Attempts to prepare 1,4,7- and 1,4,8-trifluorophenothiazines by ring closure of the appropriate trifluorodiphenylamines failed. Ring closure of IX with S and iodine 1 hr. at 190° gives 20% 2,4,7-trifluorophenothiazine, m. 147-8° (decomposition); 6.1 g. VIIIa, 1.75 g. S, and a crystal of iodine 2.5 hrs. at 170° give 44% 2,4,8-trifluorophenothiazine, m. 142-3°; 1.2 g. X, 0.31 g. S, and a crystal of iodine 1 min. at 230° and 20 min. at 210° (or 1.5 hrs. at 210-40°) give 13% (or 20%) 2,4,6,8-tetrafluorophenothiazine, needles, m. 193-3.5°. Refluxing 15 g. XVI in 150 cc. Me₂CO 0.5 hr. with 44 cc. N NaOH, evaporating the solution to dryness, and extracting the residue with boiling CCl₄ give 52% 3-trifluoromethylphenothiazine, m. 217-18°, also obtained in much lower yield from XX. In a similar way, XVII gives 59% 2-trifluoromethylphenothiazine, m. 189-90°, and XVIII gives 43% 3-fluorophenothiazine, m. 178-9°. Attempts to prepare 4-trifluoromethylphenothiazine by treating 4.6 g. XV in 46 cc. Me₂CO with NaOH, or 2-fluorophenothiazine by refluxing 4.4 g. XIX in Me₂CO with NaOH were unsuccessful. The infrared absorption spectra of these compounds are determined and an attempt is made to see if a reliable method of structure determination of fluorophenothiazines can be made with these spectra. It is found that this kind of structural determination should be approached with discretion.

Journal of Organic Chemistry published new progress about 350-19-6. 350-19-6 belongs to esters-buliding-blocks, auxiliary class Fluoride,Benzene,Ester, name is Ethyl 3,5-difluorobenzoate, and the molecular formula is C9H8F2O2, Application of Ethyl 3,5-difluorobenzoate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Li, Xin-Ran published the artcileSequential Cobalt/Rhodium-Catalyzed Tandem Cyclization of Aromatic Aldehydes with Acrylates for Preparing 3-Substituted Phthalides in Oxygen Atmosphere and Neat Water, Recommanded Product: Ethyl 3-(dimethylamino)acrylate, the publication is Asian Journal of Organic Chemistry (2022), 11(2), e202100725, database is CAplus.

Metal-catalyzed C-H activation/tandem reactions of aromatic acids and functionalized alkenes is profound for constructing phthalide skeleton. However, most of these reactions employ stoichiometric amounts of metal additives and metal oxidants/toxic organic solvents. Herein, a sequential cobalt/rhodium-catalyzed tandem cyclization of aromatic aldehydes and acrylates for preparing 3-substituted phthalides in one pot has been described. This protocol features the use of water as a sustainable solvent and oxygen as the singular oxidant free of any additives. The use of aromatic aldehydes instead of aromatic acids as starting materials renders this route high atom economy, and the formation of water as a sole byproduct makes this process practical and environmentally benign.

Asian Journal of Organic Chemistry published new progress about 924-99-2. 924-99-2 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Amine,Aliphatic hydrocarbon chain,Ester, name is Ethyl 3-(dimethylamino)acrylate, and the molecular formula is C7H13NO2, Recommanded Product: Ethyl 3-(dimethylamino)acrylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Sun, Xianfeng published the artcileMatching and mismatching effects of hybrid chiral biaxial bisphosphine ligands in enantioselective hydrogenation of ketoesters, Recommanded Product: (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), the publication is Chemistry – A European Journal (2009), 15(30), 7302-7305, S7302/1-S7302/10, database is CAplus and MEDLINE.

Three biaxial diphosphine ligands were synthesized. Their catalytic use in asym. hydrogenation of ketoesters to hydroxy esters were discussed. It was found that compound I together with [Ru(benzene)Cl₂]₂ was the best catalyst to promote the asym. hydrogenation of α-ketoesters to α-hydroxyesters.

Chemistry – A European Journal published new progress about 126613-06-7. 126613-06-7 belongs to esters-buliding-blocks, auxiliary class Chiral Diphenols, name is (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate), and the molecular formula is C9H10N2O, Recommanded Product: (R)-[1,1′-Binaphthalene]-2,2′-diyl bis(trifluoromethanesulfonate).

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Xia, Qi published the artcileCopper-Catalyzed Three-Component Reactions of α-Ketoaldehyde, 1,3-Dicarbonyl Compound, and Organic Boronic Acid in Water: A Route to 1,4-Diketones, Recommanded Product: Methyl 3-oxovalerate, the publication is Journal of Organic Chemistry (2021), 86(14), 9914-9923, database is CAplus and MEDLINE.

A novel three-component reaction of α-ketoaldehydes, 1,3-dicarbonyl compounds, and organic boronic acids catalyzed by CuO in water has been developed to give a wide range of products containing 1,3/1,4-diketones. The method has some advantages such as the use of readily available starting materials, wide substrate scopes, excellent yields, gram-scale synthesis, and mild reaction conditions.

Journal of Organic Chemistry published new progress about 30414-53-0. 30414-53-0 belongs to esters-buliding-blocks, auxiliary class Aliphatic hydrocarbon chain,Ketone,Ester, name is Methyl 3-oxovalerate, and the molecular formula is C7H5Br2F, Recommanded Product: Methyl 3-oxovalerate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Xie, He-Lou published the artcileControlling domain orientation of liquid crystalline block copolymer in thin films through tuning mesogenic chemical structures, Related Products of esters-buliding-blocks, the publication is Journal of Polymer Science, Part B: Polymer Physics (2017), 55(6), 532-541, database is CAplus.

Controlling the macroscopic orientation of nanoscale periodic structures of amphiphilic liquid crystalline block copolymers (LC BCPs) is important to a variety of tech. applications (e.g., lithium conducting polymer electrolytes). To study LC BCP domain orientation, a series of LC BCPs containing a poly(ethylene oxide) (PEO) block as a conventional hydrophilic coil block and LC blocks containing azobenzene mesogens is designed and synthesized. LC ordering in thin films of the BCP leads to the formation of highly ordered, microphase-separated nanostructures, with hexagonally arranged PEO cylinders. Substitution on the tail of the azobenzene mesogen is shown to control the orientation of the PEO cylinders. When the substitution on the mesogenic tails is an alkyl chain, the PEO cylinders have a perpendicular orientation to the substrate surface, provided the thin film is above a critical thickness value. In contrast, when the substitution on the mesogenic tails has an ether group the PEO cylinders assemble parallel to the substrate surface regardless of the film thickness value. © 2017 Wiley Periodicals, Inc.J. Polym. Sci., Part B: Polym.Phys. 2017.

Journal of Polymer Science, Part B: Polymer Physics published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C15H21BO2, Related Products of esters-buliding-blocks.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wang, Qian published the artcileThe anti-inflammatory drug dimethyl itaconate protects against colitis-associated colorectal cancer, Application of Dimethyl itaconate, the publication is Journal of Molecular Medicine (Heidelberg, Germany) (2020), 98(10), 1457-1466, database is CAplus and MEDLINE.

Abstract: Colorectal cancer (CRC) is the third most common diagnosed cancer of which risk factors include unhealthy diet, smoking, and chronic inflammation. Weakening the inflammatory response emerges as an effective therapeutic strategy to prevent the progression of CRC. Inflammatory macrophages produce substantial amounts of immunoregulatory metabolite itaconate, which is synthesized by the immune response gene 1 (Irg1). In this study, we use a membrane-permeable itaconate derivative, di-Me itaconate (DI), for the protection against CRC in mouse model. DI decreased the high inflammatory state of ulcerative colitis and reduced the colitis-associated cancer (CAC) risk. Mechanistically, DI inhibited the secretion of the cytokines IL-1β and CCL2 from intestinal epithelial cells, and therefore reduced the recruitment of macrophages into tumor microenvironment. Meanwhile, the decrease of macrophage infiltration was accompanied by a decrease of myeloid-derived suppressor cell (MDSC) infiltration and the differentiation of T cell subsets into cytotoxic T cells. Our findings demonstrate the potential application of DI for the prevention of colitis-associated CRC. Key messages: Di-Me itaconate (DI) suppresses ulcerative colitis and colitis-associated colorectal cancer DI decreases infiltration of macrophages and myeloid-derived suppressor cells into tumor DI weakens the inflammatory response via inhibiting the secretion of IL-1β and CCL2.

Journal of Molecular Medicine (Heidelberg, Germany) published new progress about 617-52-7. 617-52-7 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Aliphatic hydrocarbon chain,Ester, name is Dimethyl itaconate, and the molecular formula is C11H11BFNO4, Application of Dimethyl itaconate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Xia, Yuanyuan published the artcilePreparation of cellulose beads with high homogeneity, low crystallinity, and tunable internal structure, SDS of cas: 121-79-9, the publication is Cellulose (Dordrecht, Netherlands) (2022), 29(3), 1473-1485, database is CAplus.

The preparation of cellulose beads has attracted much attention in the application of advanced green materials. Herein, the uniform and controllable cellulose beads were prepared by first dissolving the pulp into N-methylmorpholine N-oxide (NMMO), and then regenerated in various coagulation baths (water, alc., acid, NMMO, etc.). Results showed that the crystalline structure of regenerated cellulose changed from cellulose I to cellulose II. Besides, the cellulose beads regenerated in Methanol (MT-cellulose bead) had the highest porosity (90.51%) and crystallinity (62.59%). Laser confocal microscopy was employed to reveal the coagulation mechanism of cellulose beads, and the solidification process was carried out from the inside to the outside. This is a green and facile method for preparing cellulose beads with different structures and properties that can be widely used in absorbent materials, energy storage materials, and protein chromatog.

Cellulose (Dordrecht, Netherlands) published new progress about 121-79-9. 121-79-9 belongs to esters-buliding-blocks, auxiliary class Natural product, name is Propyl 3,4,5-trihydroxybenzoate, and the molecular formula is C10H19NO3, SDS of cas: 121-79-9.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Wang, Weijin published the artcileOxoammonium salts are catalysing efficient and selective halogenation of olefins, alkynes and aromatics, SDS of cas: 103-26-4, the publication is Nature Communications (2021), 12(1), 3873, database is CAplus and MEDLINE.

Herein, TEMPO (2,2,6,6-tetramethylpiperidine nitroxide) and its derivatives are disclosed as active catalysts for electrophilic halogenation of olefins e.., prop-1-en-1-ylbenzene, alkynes R¹CCR² (R¹ = octyl, Ph; R² = H, Me, n-Bu, Ph), and aromatics R³H (R³ = 3-(carboxymethyl)-4-methoxybenzen-1-yl, 2-[ethoxy(oxo)methane]-1H-indol-3-yl, 5-phenylthiophen-2-yl, etc.). These catalysts are stable, readily available, and reactive enough to activate haleniums including Br⁺, I⁺ and even Cl⁺ reagents. This catalytic system is applicable to various halogenations including haloarylation of olefins or dibromination of alkynes, which were rarely realized in previous Lewis base catalysis or Lewis acid catalysis. The high catalytic ability is attributed to a synergistic activation model of electrophilic halogenating reagents, where the carbonyl group and the halogen atom are both activated by present TEMPO catalysis.

Nature Communications published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C12H10FeO4, SDS of cas: 103-26-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Bai, Yuye published the artcileRegioselective green preparation of haloether, haloesters and halohydrins by difunctionalization of alkenes, SDS of cas: 103-26-4, the publication is Tetrahedron Letters (2022), 153923, database is CAplus.

A protocol to generalize regioselective 1,2-difunctionalization of alkenes, which is a simple and efficient method for the preparation of haloethers, haloesters and halohydrins using alc. as nucleophiles with inexpensive and com. available N-halosuccinimide (NXS) as the halogenating reagent with low catalyst loading under mild reaction condition was demonstrated. The methodol. is also applicable for the easy access of various alkenes such as terminal, internal, heterocyclic ones and cyclic endoene with the striking features of high product yields (up to 99%); moreover, a bioactive mol. was employed as substrate to test this reaction, the corresponding products were successfully prepared with moderate to good yield without losing their ester functional group. The given protocol has the following advantages such as a direct difunctionalization of alkenes, operational simplicity, good functional group tolerance and a wide substrate scope.

Tetrahedron Letters published new progress about 103-26-4. 103-26-4 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester,Protease,Tyrosinase,Natural product, name is Methyl 3-phenyl-2-propenoate, and the molecular formula is C10H10O2, SDS of cas: 103-26-4.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics

Qiu, Nannan published the artcileA photo- and thermo-responsive star-shaped diblock copolymer with a porphyrin core prepared via consecutive ATRPs, Safety of 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, the publication is RSC Advances (2016), 6(53), 47912-47918, database is CAplus.

A star-shaped and diblock copolymer poly(6-[4-(4-methoxyphenylazo)phenoxy]hexylmethacrylate)s-b-poly(N-isopropylacrylamide)s with a zinc-porphyrin core (PAzo-b-PNIPAM) is synthesized via consecutive atom transfer radical polymerizations (ATRPs). The synthesis involves the preparation of the intermediate poly(6-[4-(4-methoxyphenylazo)phenoxy]hexylmethacrylate) with a zinc-porphyrin core (por-PAzo) via ATRP, and then por-PAzo is used as a macroinitiator to polymerize N-isopropylacrylamide (NIPAM) via ATRP to gain PAzo-b-PNIPAM. The structures of the target products are characterized by FT-IR, ¹H NMR and UV-vis spectra, and the polydispersity index (PDI) indicates that the mol. weight distribution is narrow and the polymerization is well controlled. Furthermore, the photo- and thermo-responsive properties are also investigated in detail, which demonstrate that the star-shaped diblock copolymer PAzo-b-PNIPAM has a potential application in targeted photodynamic therapy and photo-electro informational storage.

RSC Advances published new progress about 135529-02-1. 135529-02-1 belongs to esters-buliding-blocks, auxiliary class azo,Alkenyl,Benzene,Ester,Ether, name is 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate, and the molecular formula is C23H28N2O4, Safety of 6-(4-((4-Methoxyphenyl)diazenyl)phenoxy)hexyl methacrylate.

Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics