Tag: 100-200

On August 31, 2013, Camarasa, Marta; Barnils, Christian; Puig de la Bellacasa, Raimon; Teixido, Jordi; Borrell, Jose I. published an article.Category: esters-buliding-blocks The title of the article was A new and practical method for the synthesis of 6-aryl-5,6-dihydropyrido[2,3-d]pyrimidine-4,7(3H,8H)-diones. And the article contained the following:

A one step general synthetic method for the synthesis of 6-aryl-5,6-dihydropyrido[2,3-d]pyrimidine-4,7(3H,8H)-dione derivatives was described. This methodol. is based on treating a 2-aryl-substituted acrylate with a 6-amino-4(3H)-pyrimidinone derivative in the presence of a base under microwave irradiation conditions. The resulting pyrido[2,3-d]pyrimidine derivatives present an aryl substituent at position C6, precisely the one directly related to the biol. activity of such heterocyclic compounds These protocols were extended to other 2-alkyl-substituted and 3-alkyl (or aryl)-substituted acrylate derivatives but with lower yields. The synthesis of the target compounds was achieved by a reaction of 2,6-diamino-4(3H)-pyrimidinone with α-(methylene)benzeneacetic acid Me ester derivatives (acrylate esters), α-methylene-1-naphthaleneacetic acid Me ester, 2-methyl-2-propenoic acid Me ester. 6-Amino-2-(methylthio)-4(3H)-pyrimidinone was also a suitable starting material. The title compounds thus formed included 2-amino-5,8-dihydro-6-(phenyl)pyrido[2,3-d]pyrimidine-4,7(3H,6H)-dione (I) and related substances. The experimental process involved the reaction of Methyl 2-(2,6-difluorophenyl)acetate(cas: 872046-08-7).Category: esters-buliding-blocks

The Article related to pyridopyrimidine preparation, Heterocyclic Compounds (More Than One Hetero Atom): Pyrimidines and Quinazolines and other aspects.Category: esters-buliding-blocks

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Yang, Zeyu; Fu, Hengwei; Ye, Wenjie; Xie, Youyu; Liu, Qinghai; Wang, Hualei; Wei, Dongzhi published an article in 2020, the title of the article was Efficient asymmetric synthesis of chiral alcohols using high 2-propanol tolerance alcohol dehydrogenase SmADH2 via an environmentally friendly TBCR system.Quality Control of (R)-Methyl 3-hydroxybutanoate And the article contains the following content:

Alc. dehydrogenases (ADHs) together with the economical substrate-coupled cofactor regeneration system play a pivotal role in the asym. synthesis of chiral alcs.; however, severe challenges concerning the poor tolerance of enzymes to 2-propanol and the adverse effects of the byproduct, acetone, limit its applications, causing this strategy to lapse. Herein, a novel ADH gene smadh2 was identified from Stenotrophomonas maltophilia by traditional genome mining technol. The gene was cloned into Escherichia coli cells and then expressed to yield SmADH2. SmADH2 has a broad substrate spectrum and exhibits excellent tolerance and superb activity to 2-propanol even at 10.5 M (80%, volume/volume) concentration Moreover, a new thermostatic bubble column reactor (TBCR) system is successfully designed to alleviate the inhibition of the byproduct acetone by gas flow and continuously supplement 2-propanol. The organic waste can be simultaneously recovered for the purpose of green synthesis. In the sustainable system, structurally diverse chiral alcs. are synthesized at a high substrate loading (>150 g L-1) without adding external coenzymes. Among these, about 780 g L-1 (6 M) Et acetoacetate is completely converted into Et (R)-3-hydroxybutyrate in only 2.5 h with 99.9% ee and 7488 g L-1 d-1 space-time yield. Mol. dynamics simulation results shed light on the high catalytic activity toward the substrate. Therefore, the high 2-propanol tolerance SmADH2 with the TBCR system proves to be a potent biocatalytic strategy for the synthesis of chiral alcs. on an industrial scale. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Quality Control of (R)-Methyl 3-hydroxybutanoate

The Article related to asym synthesis chiral alc propanol oxidation alc dehydrogenase, thermostatic bubble column reactor system alc dehydrogenase ketone reduction, Fermentation and Bioindustrial Chemistry: Pharmaceuticals (Including Nutrients) and other aspects.Quality Control of (R)-Methyl 3-hydroxybutanoate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Cui, Y. H.; Wei, P.; Peng, F.; Zong, M. H.; Lou, W. Y. published an article in 2018, the title of the article was Efficient biocatalytic stereoselective reduction of methyl acetoacetate catalyzed by whole cells of engineered E. coli.Application In Synthesis of (R)-Methyl 3-hydroxybutanoate And the article contains the following content:

Asym. synthesis of chiral β-hydroxy esters, the key building blocks for many functional materials, is currently of great interest. In this study, the biocatalytic anti-Prelog reduction of Me acetoacetate (MAA) to methyl-(R)-3-hydroxybutyrate ((R)-HBME) was successfully carried out with high enantioselectivity using the whole cell of engineered E. coli, which harbored an AcCR (carbonyl reductase) gene from Acetobacter sp. CCTCC M209061 and a GDH (glucose dehydrogenase) gene from Bacillus subtilis 168 for the in situ regeneration of the coenzyme. Compared with the corresponding wild strain, the engineered E. coli cells were proved to be more effective for the bio-reduction of MAA, and afforded much higher productivity. Under the optimized conditions, the product e.e. was >99.9% and the maximum yield was 85.3% after a reaction time of 10 h, which were much higher than those reported previously. In addition, the production of (R)-HBME increased significantly by using a fed-batch strategy of tuning pH, with a space-time yield of approx. 265 g L-1 d-1, thus the issue in previous research of relatively low substrate concentrations appears to be solved. Besides, the established bio-catalytic system was proved to be feasible up to a 150 mL scale with a large-scale relatively high substrate concentration and selectivity. For further industrial application, these results open a way to use of whole cells of engineered E. coli for challenging higher substrate concentrations of β-ketone esters enantioselective reduction reactions. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Application In Synthesis of (R)-Methyl 3-hydroxybutanoate

The Article related to methyl acetoacetate escherichia coli, Fermentation and Bioindustrial Chemistry: Pharmaceuticals (Including Nutrients) and other aspects.Application In Synthesis of (R)-Methyl 3-hydroxybutanoate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On October 6, 2005, Kurimoto, Ayumu; Hashimoto, Kazuki; Isobe, Yoshiaki; Brough, Stephen; Millichip, Ian; Wada, Hiroki; Bonnert, Roger; McInally, Thomas published a patent.Formula: C10H10O3 The title of the patent was Preparation of 8-oxoadenine compounds as immunomodulators. And the patent contained the following:

Title compounds I [ring A = aromatic carbocycle, etc.; R = halo, etc.; n = 0-2; Z1 = (un)substituted alkylene, etc.; X2 = O, etc.; Y1, Y2, Y3 = alkylene, etc.; X1 = O, etc.; R2 = H, (un)substituted alkyl, etc.; R1 = H, OH, etc.] were prepared For example, bromination of 2-butoxy-9-[2-(3-methoxycarbonylphenoxy)ethyl]adenine, e.g., prepared from Me 3-hydroxybenzoate in 2 steps, using Br2 followed by treatment with NaOH afforded compound II. In interferon induction assays (in vitro), the min. effective concentration of compound II was 0.3 nM. Compounds I are claimed useful for the treatment of cancer, allergy, etc. Formulation is given. The experimental process involved the reaction of Methyl 2-(3-formylphenyl)acetate(cas: 142327-44-4).Formula: C10H10O3

The Article related to oxoadenine preparation immunomodulator, antitumor antiallergic agent oxoadenine preparation, Heterocyclic Compounds (More Than One Hetero Atom): Pyrimidines and Quinazolines and other aspects.Formula: C10H10O3

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On March 29, 2007, Hashimoto, Kazuki; Nakamura, Tomoaki; Nakamura, Kei; Tojo, Shingo; Kurimoto, Ayumu; Isobe, Yoshiaki; Wada, Hiroki; Bonnert, Roger published a patent.Electric Literature of 142327-44-4 The title of the patent was Preparation of adenine derivatives as TLR7 agonists. And the patent contained the following:

Title compounds I [R1 = halo, (un)substituted alkyl, (un)substituted alkenyl, etc.; R2 = H, (un)substituted alkyl, (un)substituted alkenyl, etc.; X = O, S, NR4, etc.; with the proviso that if R1 is halo, X is a single bond; R4 = H, alkyl; A1 = (un)substituted, (un)saturated nitrogenous heterocycle containing hetero atoms selected from N, O and S; A2 = (un)substituted aromatic carbocycle, (un)substituted aromatic heterocycle; L3 = (un)substituted alkylene, single bond; L1, L2 = alkylene (1-3 methylene in alkylene may be replaced with O, S, NR5, etc.), single bond; R5 = H, (un)substituted alkyl, (un)substituted cycloalkyl, etc.] or their pharmaceutically acceptable salts were prepared For example, de-tert-butoxycarbonylation of 2-butoxy-9-[(1-[3-[N-(tert-butoxycarbonyl)-N-methylamino]propyl]piperidin-4-yl)methyl]-8-methoxyadenine, e.g., prepared from 4-hydroxymethylpiperidine-1-carboxylic acid tert-Bu ester in 3 steps, followed by reductive amination with 3-formylphenylacetic acid Me ester and treatment with sulfuric acid afforded compound II. In toll-like receptor 7 (TLR7) binding assays, the EC50 value of compound III was 74.5 nM. Compounds I are claimed useful for the treatment of asthma, COPD, etc. The experimental process involved the reaction of Methyl 2-(3-formylphenyl)acetate(cas: 142327-44-4).Electric Literature of 142327-44-4

The Article related to adenine preparation tlr7 agonist, asthma copd treatment adenine preparation tlr7 agonist, Heterocyclic Compounds (More Than One Hetero Atom): Pyrimidines and Quinazolines and other aspects.Electric Literature of 142327-44-4

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On June 30, 2016, Ioannidis, Stephanos; Talbot, Adam Charles; Follows, Bruce; Buckmelter, Alexandre Joseph; Wang, Minghua; Campbell, Ann-Marie; Schmidt, Darby Rye; Guerin, David Joseph; Caravella, Justin A.; Diebold, R. Bruce; Ericsson, Anna; Lancia, David, Jr. published a patent.Category: esters-buliding-blocks The title of the patent was Preparation of pyrrolo and pyrazolopyrimidines as ubiquitin-specific protease 7 inhibitors. And the patent contained the following:

The invention relates to inhibitors of ubiquitin-specific protease 7 (USP7) of formula I useful in the treatment of cancers, neurodegenerative diseases, immunol. disorders, inflammatory disorders, cardiovascular diseases, ischemic diseases, viral infections and diseases, and bacterial infections and diseases. I [wherein X1 = C, S, or S(O); X2 = CH, CD, C-halo, etc.; R1 = H, D, -OH, etc.; R2 = (C1-C8) alkyl, aryl, heteroaryl, etc.; each R3 independently = D, aryl, heteroaryl, etc.; R4 = (C1-C6) alkyl, CD3, heteroaryl etc.; R5 and R5′ independently = H, D, (C1-C6) alkyl, (C2-C6) alkenyl, etc.; R6 = H, D, (C1-C6) alkyl, etc.; m = 0, 1, or 2; n = 0, 1, 2, or 3] or a pharmaceutically acceptable salt, hydrate, solvate, prodrug, stereoisomer, or tautomer, thereof, are claimed and exemplified. II was prepared via a multistep process (preparation given). I were evaluated for USP7 inhibitor activity using a Ubitquin-Rhodamine 110 assay (data provided). The experimental process involved the reaction of Methyl 1-methyl-4-oxocyclohexanecarboxylate(cas: 37480-41-4).Category: esters-buliding-blocks

The Article related to pyrrolopyrimidine pyrazolopyrimidine preparation ubiquitin specific protease inhibitor, Heterocyclic Compounds (More Than One Hetero Atom): Pyrimidines and Quinazolines and other aspects.Category: esters-buliding-blocks

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On March 31, 2012, Curran, Dennis P.; Sinha, Mantosh K.; Zhang, Kai; Sabatini, Jesse J.; Cho, Dae-Hyun published an article.Name: (R)-Methyl 3-hydroxybutanoate The title of the article was Binary fluorous tagging enables the synthesis and separation of a 16-stereoisomer library of macrosphelides [Erratum to document cited in CA156:230324]. And the article contained the following:

On page 129, it erroneously stated the authors had no competing financial interests; the HTML and PDF versions have been corrected The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Name: (R)-Methyl 3-hydroxybutanoate

The Article related to erratum macrosphelide stereoisomer library preparation binary fluorous tagging, Biomolecules and Their Synthetic Analogs: Other Bacterial and Fungal Metabolites and other aspects.Name: (R)-Methyl 3-hydroxybutanoate

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On September 17, 2021, Jiang, Meifen; Liu, Minjie; Yu, Chao; Cheng, Dang; Chen, Fener published an article.Computed Properties of 517-23-7 The title of the article was Fully Continuous Flow Synthesis of 3-Chloro-4-oxopentyl Acetate: An Important Intermediate for Vitamin B1. And the article contained the following:

A fully continuous flow synthesis of 3-chloro-4-oxopentyl acetate, an important intermediate for vitamin B1, was developed. This continuous flow manufacturing included two chem. transformations and an inline extraction step without intermediate purification and solvent exchange. In this work, the traditional synthetic route for batch operation was efficiently simplified via a series of separated screening tests in flows under various conditions. The authors found that the chlorination reaction can be carried out in only 30 s at room temperature by flow. The decarboxylation/acylation step was also simplified by using a cross-mixer, so that acetic anhydride was no longer required in the acylation reaction. A computational fluid dynamics simulation was carried out to study the improved micromixing of liquid-liquid two-phase streams. Finally, 3-chloro-4-oxopentyl acetate was obtained in a 90% isolated yield with a product purity of 96% and a total residence time of approx. 32 min. This fully continuous process was operated smoothly for 12 h, and approx. 19.1 g of the desired product was generated with a production rate of 1.79 g h-1. The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).Computed Properties of 517-23-7

The Article related to chlorooxopentyl acetate preparation vitamin b1 intermediate continuous flow, Aliphatic Compounds: Esters, Linear Anhydrides, Acyl Peroxides, and Acyl Halides and other aspects.Computed Properties of 517-23-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

On February 29, 2012, Curran, Dennis P.; Sinha, Mantosh K.; Zhang, Kai; Sabatini, Jesse J.; Cho, Dae-Hyun published an article.Recommanded Product: 3976-69-0 The title of the article was Binary fluorous tagging enables the synthesis and separation of a 16-stereoisomer library of macrosphelides. And the article contained the following:

Fluorous mixture synthesis minimizes the effort to synthesize small-mol. libraries by labeling the mols. rather than the reaction vessels. Reactants are labeled with fluorinated tags and products can later be demixed based on the fluorine content. A limit in the number of available tags can be overcome by using binary encoding so that a total of four tags can label uniquely a library of 16 compounds This strategy, however, means that separation based on fluorine content alone is not possible. Here, we solve this problem by selectively removing one tag after an initial demixing step; a second demixing provides each individual compound The usefulness of this strategy is demonstrated by the synthesis of a library that contains all 16 diastereomers of the natural products macrosphelides A and E. Macrosphelide D was not in this library, and so its assigned structure was incorrect. We determined its constitution by using NMR spectroscopy and its configuration by synthesizing four candidate stereoisomers. The experimental process involved the reaction of (R)-Methyl 3-hydroxybutanoate(cas: 3976-69-0).Recommanded Product: 3976-69-0

The Article related to macrosphelide stereoisomer library preparation binary fluorous tagging, Biomolecules and Their Synthetic Analogs: Other Bacterial and Fungal Metabolites and other aspects.Recommanded Product: 3976-69-0

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics

Gupta, Poonam published an article in 2021, the title of the article was Synthesis of related substances of antipsychotic drug Risperidone.SDS of cas: 517-23-7 And the article contains the following content:

European pharmacopeia related substances I [ R1 = H, CH3; R2 = (5-fluoro-1,2-benzoxazol-3-yl), (4-fluoro-2-hydroxy-benzoyl) etc] (impurities) was obtained during the synthesis of Risperidone. Described the detection, origin, synthesis, characterization and control of the related substances, which was improved the com. process. The experimental process involved the reaction of 3-Acetyldihydrofuran-2(3H)-one(cas: 517-23-7).SDS of cas: 517-23-7

The Article related to methyl piperidyl ethyl tetrahydropyridopyrimidinone preparation, Heterocyclic Compounds (More Than One Hetero Atom): Pyrimidines and Quinazolines and other aspects.SDS of cas: 517-23-7

Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics