Tag: M.W=150-200

Okinczyc, Piotr published the artcileProfile of polyphenolic and essential oil composition of polish propolis, black poplar and aspens buds, Application In Synthesis of 5205-11-8, the publication is Molecules (2018), 23(6), 1262/1-1262/18, database is CAplus and MEDLINE.

In this work, we studied similarities and differences between 70% ethanol in water extract (70EE) and essential oils (EOs) obtained from propolis, black poplars (Populus nigra L.) and aspens (P. tremula L.) to ascertain which of these is a better indicator of the plant species used by bees to collect propolis precursors. Composition of 70EE was analyzed by UPLC-PDA-MS, while GC-MS was used to research the EOs. Principal component analyses (PCA) and calculations of Spearman’s coefficient rank were used for statistical anal. Statistical anal. exhibited correlation between chem. compositions of propolis and Populus buds’ 70EE. In the case of EOs, results were less clear. Compositions of black poplars, aspens EOs and propolises have shown more variability than 70EE. Different factors such as higher instability of EOs compared to 70EE, different degradation pattern of benzyl esters to benzoic acid, differences in plant metabolism and bees’ preferences may be responsible for these phenomena. Our research has therefore shown that 70EE of propolis reflected the composition of P. nigra or complex aspen-black poplar origin.

Molecules published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C12H14O2, Application In Synthesis of 5205-11-8.

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

Reddy, G. Sudhakar published the artcileNitrosyl Triflate and Nitrous Anhydride, Same Mode of Generation, but Very Different Reaction Pathways. Direct Synthesis of 1,2-Oxazetes, Nitroso or Bisoxazo Compounds from Olefins, Related Products of esters-buliding-blocks, the publication is Organic Letters (2022), 24(23), 4202-4206, database is CAplus and MEDLINE.

Nitrosyl triflate (TfONO) can be generated in situ from tetra-n-butylammonium nitrite and triflic anhydride (1:1) in CH₂Cl₂ solution at ca. -30°C. It acts as a powerful and soluble nitrosating agent with a wide range of olefinic or aromatic substrates. Nitrous anhydride (O=N-O-N=O) can be generated in the same way using tetra-n-butylammonium nitrite and triflic anhydride (2:1) in CH₂Cl₂ solution at ca. -30°C. Each reagent has been isolated and characterized. They react with olefins to give different products. Nitrosyl triflate is an excellent reagent for generating either vinylic or allylic nitroso compounds or their dimeric bisoxazo derivates. Nitrous anhydride efficiently converts many olefins to 1,2-oxazetes in a single step, making this class of compounds readily available from olefins for the first time. Authors have also discovered another route to 1,2-oxazetes involving a novel rearrangement/isomerization of allylic nitroso compounds which is catalyzed by Pd-C/H₂.

Organic Letters published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C12H14O2, Related Products of esters-buliding-blocks.

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

Jin, Chunlian published the artcileGas chromatography-mass spectrometry analysis of natural products in Gypsophila paniculata, COA of Formula: C8H14O4, the publication is HortScience (2021), 56(10), 1195-1198, database is CAplus.

Gypsophila paniculata is an ornamental crop with medicinal value. To date, limited information has been reported about the natural products in G. paniculata to explain its medicinal function. The current study reports the natural products found in G. paniculata stem for the first time. Thirty-three compounds were isolated from the extract of G. paniculata stem and identified by gas chromatog.-mass spectrometry, 10 of which have contents >2%. These were 2-O-methyl-D-mannopyranose (37.4706%), glycerol (12.5669%), two tetratetracontane isomer (7.6523 + 3.5145%), tetrahygro-4-pyranol (5.3254%), 1,6-anhydro-beta-d-glucopyranos (4.7507%), palmitic acid (4.1848%), 4-hydroxy-3-methoxystyrene (3.7439%), methyl-octadeca-9,12-dienoate (2.7490%), and 2-deoxy-D-galactose (2.6193%). Another bioactive compound, condrillasterol, was identified with 1.3384% content. We also reported that G. paniculata possesses antioxidant activity possibly associated with the presence of a phenolic chem. 4-hydroxy-3-methoxystyrene. Our data collectively demonstrate that G. paniculata contains some bioactive compounds with high contents and antioxidants, consistent with its role as a medicinal herb.

HortScience published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C8H14O4, COA of Formula: C8H14O4.

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

Korman, Arthur published the artcileLight-controlled twister ribozyme with single-molecule detection resolves RNA function in time and space, Safety of Methyl 2-(3-formyl-4-hydroxyphenyl)acetate, the publication is Proceedings of the National Academy of Sciences of the United States of America (2020), 117(22), 12080-12086, database is CAplus and MEDLINE.

Small ribozymes such as Oryza sativa twister spontaneously cleave their own RNA when the ribozyme folds into its active conformation. The coupling between twister folding and self-cleavage has been difficult to study, however, because the active ribozyme rapidly converts to product. Here, we describe the synthesis of a photocaged nucleotide that releases guanosine within microseconds upon photosolvolysis with blue light. Application of this tool to O. sativa twister achieved the spatial (75 μm) and temporal (â‰?0 ms) control required to resolve folding and self-cleavage events when combined with single-mol. fluorescence detection of the ribozyme folding pathway. Real-time observation of single ribozymes after photo-deprotection showed that the precleaved folded state is unstable and quickly unfolds if the RNA does not react. Kinetic anal. showed that Mg2+ and Mn2+ ions increase ribozyme efficiency by making transitions to the high energy active conformation more probable, rather than by stabilizing the folded ground state or the cleaved product. This tool for light-controlled single RNA folding should offer precise and rapid control of other nucleic acid systems.

Proceedings of the National Academy of Sciences of the United States of America published new progress about 61874-04-2. 61874-04-2 belongs to esters-buliding-blocks, auxiliary class Benzene,Phenol,Ester,Aldehyde, name is Methyl 2-(3-formyl-4-hydroxyphenyl)acetate, and the molecular formula is C10H10O4, Safety of Methyl 2-(3-formyl-4-hydroxyphenyl)acetate.

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

Cui, Bin published the artcileMn(OAc)₃-Mediated Hydrotrifluoromethylation of Unactivated Alkenes Using CF₃SO₂Na as the Trifluoromethyl Source, Quality Control of 5205-11-8, the publication is Journal of Organic Chemistry (2018), 83(11), 6015-6024, database is CAplus and MEDLINE.

Unfunctionalized alkenes such as alkenyl ethers, amides, sulfonamides, and esters underwent regioselective hydrotrifluoromethylation with F₃CSO₂Na (Langlois’s reagent) mediated by Mn(OAc)₃ in AcOH at ambient temperature under Ar. TEMPO inhibited the hydrotrifluoromethylation (yielding TEMPO-CF₃), and hydrotrifluoromethylation of N,N-diallyl-p-toluenesulfonamide yielded a trifluoroethyl-substituted pyrrolidine, consistent with a radical mechanism for the hydrotrifluoromethylation reaction; deuteration experiments with O- and C-deuterated acetic acid were performed to determine the source of hydrogen atoms.

Journal of Organic Chemistry published new progress about 5205-11-8. 5205-11-8 belongs to esters-buliding-blocks, auxiliary class Alkenyl,Benzene,Ester, name is 3-Methylbut-2-en-1-yl benzoate, and the molecular formula is C12H14O2, Quality Control of 5205-11-8.

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

Xu, Shujing published the artcileDesign, synthesis, and mechanistic investigations of phenylalanine derivatives containing a benzothiazole moiety as HIV-1 capsid inhibitors with improved metabolic stability, Product Details of C9H8O4, the publication is European Journal of Medicinal Chemistry (2022), 113903, database is CAplus and MEDLINE.

Further clin. development of I, a lead compound targeting HIV-1 capsid, is impeded by low antiviral activity and inferior metabolic stability. By modifying the benzene (region I) and indole of I, we identified two potent compounds II [R = propargyl, 4-NH₂Ph] with significantly improved metabolic stability. Compared to PF74, II [R = 4-NH₂Ph] displayed greater metabolic stability in human liver microsomes (HLMs) with half-life (t_1/2) 109-fold that of PF74. Moreover, mechanism of action (MOA) studies demonstrated that II [R = propargyl, 4-NH₂Ph] effectively mirrored the MOA of compounds that interact within the I interprotomer pocket, showing direct and robust interactions with recombinant CA, and 7u displaying antiviral effects in both the early and late stages of HIV-1 replication. Furthermore, MD simulation corroborated that II [R = 4-NH₂Ph] was bound to the I binding site, and the results of the online molinspiration software predicted that II [R = propargyl, 4-NH₂Ph] had desirable physicochem. properties. Unexpectedly, this series of compounds exhibited better antiviral activity than I against HIV-2, represented by compound II [R = propargyl] whose anti-HIV-2 activity was almost 5 times increased potency over I. Therefore, we have rationally redesigned the I chemotype to inhibitors with novel structures and enhanced metabolic stability in this study. We hope that these new compounds can serve as a blueprint for developing a new generation of HIV treatment regimens.

European Journal of Medicinal Chemistry published new progress about 1877-71-0. 1877-71-0 belongs to esters-buliding-blocks, auxiliary class Carboxylic acid,Benzene,Ester, name is 3-(Methoxycarbonyl)benzoic acid, and the molecular formula is C20H28B2O4S2, Product Details of C9H8O4.

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

Tang, Shuqin published the artcilePrenatal Exposure to Emerging Plasticizers and Synthetic Antioxidants and Their Potency to Cross Human Placenta, Related Products of esters-buliding-blocks, the publication is Environmental Science & Technology (2022), 56(12), 8507-8517, database is CAplus and MEDLINE.

Gestational exposure to environmental chems. and subsequent permeation through the placental barrier represents potential health risks to both pregnant women and their fetuses. In the present study, we explored prenatal exposure to a suite of 46 emerging plasticizers and synthetic antioxidants (including five transformation products of 2,6-di-tert-butyl-4-hydroxytoluene, BHT) and their potency to cross human placenta based on a total of 109 maternal and cord serum pairs. Most of these chems. have rarely or never been investigated for prenatal exposure and associated health risks. Eleven of them exhibited detection frequency greater than 50% in maternal blood, including di-Bu fumarate (DBF), 2,6-di-tert-butylphenol (2,4-DtBP), 1,3-diphenylguanidine (DPG), methyl-2-(benzoyl)benzoate (MBB), tri-Et citrate (TEC), BHT, and its five metabolites, with a median concentration from 0.05 to 3.1 ng/mL. The transplacental transfer efficiency (TTE) was determined for selected chems. with valid measurements in more than 10 maternal/cord blood pairs, and the mean TTEs exhibited a large variation (i.e., 0.29-2.14) between chems. The determined TTEs for some of the target chems. were comparable to the predicted values by our previously proposed models developed from mol. descriptors, indicating that their transplacental transfer potency could be largely affected by physicochem. properties and mol. structures. However, addnl. biol. and physiol. factors may influence the potency of environmental chems. to cross human placenta. Overall, our study findings raise concern on human exposure to an increasing list of plastic additives during critical life stages (e.g., pregnancy) and potential health risks.

Environmental Science & Technology published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C5H10Cl3O3P, Related Products of esters-buliding-blocks.

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

Tang, Shuqin published the artcilePrenatal Exposure to Emerging Plasticizers and Synthetic Antioxidants and Their Potency to Cross Human Placenta, Application of Dimethyl adipate, the publication is Environmental Science & Technology (2022), 56(12), 8507-8517, database is CAplus and MEDLINE.

Gestational exposure to environmental chems. and subsequent permeation through the placental barrier represents potential health risks to both pregnant women and their fetuses. In the present study, we explored prenatal exposure to a suite of 46 emerging plasticizers and synthetic antioxidants (including five transformation products of 2,6-di-tert-butyl-4-hydroxytoluene, BHT) and their potency to cross human placenta based on a total of 109 maternal and cord serum pairs. Most of these chems. have rarely or never been investigated for prenatal exposure and associated health risks. Eleven of them exhibited detection frequency greater than 50% in maternal blood, including di-Bu fumarate (DBF), 2,6-di-tert-butylphenol (2,4-DtBP), 1,3-diphenylguanidine (DPG), methyl-2-(benzoyl)benzoate (MBB), tri-Et citrate (TEC), BHT, and its five metabolites, with a median concentration from 0.05 to 3.1 ng/mL. The transplacental transfer efficiency (TTE) was determined for selected chems. with valid measurements in more than 10 maternal/cord blood pairs, and the mean TTEs exhibited a large variation (i.e., 0.29-2.14) between chems. The determined TTEs for some of the target chems. were comparable to the predicted values by our previously proposed models developed from mol. descriptors, indicating that their transplacental transfer potency could be largely affected by physicochem. properties and mol. structures. However, addnl. biol. and physiol. factors may influence the potency of environmental chems. to cross human placenta. Overall, our study findings raise concern on human exposure to an increasing list of plastic additives during critical life stages (e.g., pregnancy) and potential health risks.

Environmental Science & Technology published new progress about 627-93-0. 627-93-0 belongs to esters-buliding-blocks, auxiliary class Ploymers, name is Dimethyl adipate, and the molecular formula is C15H21BO3, Application of Dimethyl adipate.

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

Bamisha, P. published the artcileAn easy access to 2,3-dihydrofuran derivatives by oxidative cyclization reactions, Category: esters-buliding-blocks, the publication is Materials Today: Proceedings (2022), 59(Part_1), 1138-1143, database is CAplus.

An easy and simple access to 2,3-dihydrofuran derivatives from 1,3-dicarbonyl compounds and Me cinnamate was reported. The reaction was facilitated by the CAN mediated oxidative free radical cyclization reaction. Moderate to good yields of products were obtained and preliminary studies of these showed potential medicinal activities. These compounds also find application in material chem. and in dyes.

Materials Today: Proceedings 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, Category: esters-buliding-blocks.

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

Shah, Parag K. published the artcilePhotopolymerization shrinkage-stress reduction in polymer-based dental restoratives by surface modification of fillers, Computed Properties of 10287-53-3, the publication is Dental Materials (2021), 37(4), 578-587, database is CAplus and MEDLINE.

This research explores the use of polymer brushes for surface treatment of fillers used in polymer-based dental restoratives with focus on shrinkage stress reduction The influence of interfacial reactive groups on shrinkage stress is explored. Oligomers of varying lengths and with varying number of reactive groups along the length were synthesized by modifying com. oligomers. Surface of silica fillers (OX50) was treated with methylaminopropyltrimethoxysilane and this was further reacted with the synthesized oligomers to obtain a series of polymer brushes on the surface. Fillers modified with -methacryloxypropyltrimethoxysilane were used as a control. Filler surface treatment was confirmed using diffuse reflectance spectroscopy and thermogravimetric anal. Fillers were added at 30 wt% to a resin made of BisGMA/TEGDMA and polymerization kinetics, shrinkage stress, volumetric shrinkage, flexural strength and modulus, viscosity were measured. Composites with polymer brush functionalized fillers showed up to a 30% reduction in shrinkage stress as compared to the control, with no reduction in flexural strength and modulus. Shrinkage stress reduced with increasing length of the polymer brush and increased with increase in number of reactive groups along the length of the polymer brush. The interface between inorganic fillers and an organic polymer matrix has been utilized to reduce shrinkage stress in a composite with no compromise in mech. properties. This study gives insights into the stress development mechanism at the interface.

Dental Materials published new progress about 10287-53-3. 10287-53-3 belongs to esters-buliding-blocks, auxiliary class Amine,Benzene,Ester, name is Ethyl 4-dimethylaminobenzoate, and the molecular formula is C9H6N2O2, Computed Properties of 10287-53-3.

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