Author: Jessica.F

Sattenapally, Narsimha;Sharma, Jhanvi;Hou, Yuqing published 《Selective conversion of primary amides to esters promoted by KHSO₄》 in 2018. The article was appeared in 《ARKIVOC (Gainesville, FL, United States)》. They have made some progress in their research.Synthetic Route of C9H10O2 The article mentions the following:

Primary amides, either aliphatic or aromatic, were easily converted to the corresponding esters via reflux in lower primary alcs. in the presence of KHSO₄. Secondary amides led to complicated mixtures under analogous conditions, whereas tertiary amides were inert. Use of iso-Pr alc. resulted in the formation of product at slower rate and lower yield along with side products, whereas, use of tertiary alcs. did not give successful conversion and allyl and benzyl alc. provided complex mixtures And Methyl 3-methylbenzoate (cas: 99-36-5) was used in the research process.

Methyl 3-methylbenzoate (cas: 99-36-5) is a common ester.Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids.Synthetic Route of C9H10O2 Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries.

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

Melais, Nedjma;Aribi-Zouioueche, Louisa;Riant, Olivier published 《The effect of the migrating group structure on enantioselectivity in lipase-catalyzed kinetic resolution of 1-phenylethanol》. The research results were published in《Comptes Rendus Chimie》 in 2016.SDS of cas: 93-92-5 The article conveys some information:

We have studied the effects of the acyl moiety on the enantioselectivity of three lipases: Candida antarctica B, Pseudomonas cepacia and Candida cylindracea, frequently used in kinetic resolutions by acylation or hydrolysis. The size of the acyl group was examined using various enol esters during the transesterification of 1-phenylethanol and the hydrolysis of the corresponding phenylethyl esters. C. antarctica-B lipase showed the highest selectivity in the transesterification of 1-phenylethanol with isopropenyl and vinyl acetate, vinyl decanoate, vinyl laurate, (E > 200). The esters 1-Ph -ethyl-acetate, decanoate and laurate are also hydrolyzed with high selectivities (E > 150) with CAL-B. The results can be correlated to the three-dimensional form of each lipase. The effect of the migrating group on the reactivity and selectivity of the lipases are discussed for both reactions. And 1-Phenylethyl acetate (cas: 93-92-5) was used in the research process.

1-Phenylethyl acetate(cas:93-92-5) is a carboxylic ester. SDS of cas: 93-92-5 It may be prepared by acetylation of methyl phenyl carbinol; from benzaldehyde by reacting with magnesium methyl bromide and subsequent acetylation; from 1-bromoethylbenzene and silver acetate in acetic acid.

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

Slavchev, Ivaylo;Ward, Jas. S.;Rissanen, Kari;Dobrikov, Georgi M.;Simeonov, Svilen published 《Base-promoted direct amidation of esters: beyond the current scope and practical applications》. The research results were published in《RSC Advances》 in 2022.Reference of Methyl 3-methylbenzoate The article conveys some information:

The base-promoted direct amidation of unactivated esters is among the most useful reactions for amide bond formation in contemporary organic chem. The intensive research in this area has led to the development of a number of new methods to achive this transformation. However, to date, the existing literature is more methodol. and in many instances lacks practical directions. Therefore, the full potential of this transformation is yet to be revealed by broadening the substrate scope. In a search for new practical applications of the amidation reaction, herein a comprehensive study of a number of base-promoted direct amidations that encompass a wide range of amines and esters is presented. Furthermore, authors applied their findings in the synthesis of phosphoramidates and several industrially relevant products. The experimental procedure involved many compounds, such as Methyl 3-methylbenzoate (cas: 99-36-5) .

Methyl 3-methylbenzoate (cas: 99-36-5) is a common ester.Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids.Reference of Methyl 3-methylbenzoate Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries.

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

Synthetic Route of C9H10O2《Reactions of benzyltriphenylphosphonium salts under photoredox catalysis》 was published in 2021. The authors were Boldt, Andrew M.;Dickinson, Sidney I.;Ramirez, Jonathan R.;Benz-Weeden, Anna M.;Wilson, David S.;Stevenson, Susan M., and the article was included in《Organic & Biomolecular Chemistry》. The author mentioned the following in the article:

The development of benzyltriphenylphosphonium salts RCH₂P⁺(C₆H₅)₃X^– (R = 3-methylphenyl, 4-bromophenyl, 3,5-dimethylphenyl, etc.; X = Cl, Br) as alkyl radical precursors using photoredox catalysis is described. Depending on substituents, the benzylic radicals may couple to form C-C bonds or abstract a hydrogen atom to form C-H bonds. A natural product, brittonin A, was also synthesized using this method. The experimental procedure involved many compounds, such as Methyl 3-methylbenzoate (cas: 99-36-5) .

Methyl 3-methylbenzoate (cas: 99-36-5) is a common ester.Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids.Synthetic Route of C9H10O2 Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries.

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

Formula: C15H28O2In 2020, Tahiri, Nabil;Fodran, Peter;Jayaraman, Dhineshkumar;Buter, Jeffrey;Witte, Martin D.;Ocampo, Tonatiuh A.;Moody, D. Branch;Van Rhijn, Ildiko;Minnaard, Adriaan J. published 《Total Synthesis of a Mycolic Acid from Mycobacterium tuberculosis》. 《Angewandte Chemie, International Edition》published the findings. The article contains the following contents:

In Mycobacterium tuberculosis, mycolic acids and their glycerol, glucose, and trehalose esters (“cord factor”) form the main part of the mycomembrane. Despite their first isolation almost a century ago, full stereochem. evaluation is lacking, as is a scalable synthesis required for accurate immunol., including vaccination, studies. Herein, we report an efficient, convergent, gram-scale synthesis of four stereo-isomers of a mycolic acid and its glucose ester. Binding to the antigen presenting protein CD1b and T cell activation studies are used to confirm the antigenicity of the synthetic material. The absolute stereochem. of the syn-methoxy Me moiety in natural material is evaluated by comparing its optical rotation with that of synthetic material. To complete the study, the researchers used Oxacyclohexadecan-2-one (cas: 106-02-5) .

Oxacyclohexadecan-2-one(cas:106-02-5) is a natural product found in Lonicera japonica and Angelica archangelica.Formula: C15H28O2 It is a macrocyclic lactone that can be used as a flavoring agent and fragrance ingredient due to its musk flavor/odor.

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

Carvalho da Silva, Romezio Alves;Marques de Mesquita, Bruna;Frota de Farias, Iolanda;Garcia do Nascimento, Patricia Georgiana;Gomes de Lemos, Telma Leda;Monte, Francisco Jose Queiroz published 《Enzymatic chemical transformations of aldehydes, ketones, esters and alcohols using plant fragments as the only biocatalyst: Ximenia americana grains》 in 2018. The article was appeared in 《Molecular Catalysis》. They have made some progress in their research.Electric Literature of C10H12O2 The article mentions the following:

The present study demonstrated the ability of Ximenia american as a biocatalyst in reduction, hydrolysis and esterification reactions. The reduction reactions of aldehydes and ketones, ester hydrolysis and esterification of alcs. were carried out with interesting results. Reduction of ketones afforded yields of 6-60% with ee in the range of 35->99% and that of aldehydes in yields of 51-99%. On the other hand, ester hydrolysis afforded yields of 58-98% with ee in the range 34-87%, while esterification of alcs. in 18-99% yields. Exptl. conditions for all reactions have been defined using standard substrates as indicated in results and discussion. Some of the products are the potential building blocks for the synthesis of mols. which are of pharmaceutical and agrochem. importance. To complete the study, the researchers used 1-Phenylethyl acetate (cas: 93-92-5) .

1-Phenylethyl acetate(cas:93-92-5) is a carboxylic ester. Electric Literature of C10H12O2 It may be prepared by acetylation of methyl phenyl carbinol; from 1-bromoethylbenzene and silver acetate in acetic acid; from benzaldehyde by reacting with magnesium methyl bromide and subsequent acetylation.

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

Ojima, Fumihiro;Osa, Tetsuo published 《Perkin-Markovnikov type reaction initiated with electrogenerated superoxide ion》 in 1989. The article was appeared in 《Bulletin of the Chemical Society of Japan》. They have made some progress in their research.Category: esters-buliding-blocks The article mentions the following:

The cyclic condensation of active methylene compounds such as di-Et malonate, di-Me malonate, Et acetoacetate or acetylacetone and dibromoalkanes such as 1,2-dibromobutane, or 1,4-dibromopentane with electrogenerated superoxide ion was studied electrochem. in DMF using cyclic voltammetry (CV) and controlled potential macroelectrolysis. The CV shows that electrogenerated superoxide ion reacts with both active methylene compounds and dibromoalkanes in the dissolved oxygen medium. Controlled potential macroelectrolysis of the above components generally yielded cycloalkanes as the main products. In comparison, the chem. method using sodium ethoxide was also carried out. Two reaction mechanisms via the proton abstraction of active methylene compds, with electrogenerated superoxide ion and via the nucleophilic attack of the superoxide ion on dibromoalkanes are presented. To complete the study, the researchers used Diethyl cyclobutane-1,1-dicarboxylate (cas: 3779-29-1) .

Diethyl 1,1-cyclobutanedicarboxylate(cas:3779-29-1 Category: esters-buliding-blocks) reacts with silicon to form diethyl esters and magnesium to form magnesium salts. The reaction time for this compound is short, which may be due to its ability to undergo debromination.

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

Quality Control of Methyl 3-methylbenzoate《Efficient Copper-Catalyzed Multicomponent Synthesis of N-Acyl Amidines via Acyl Nitrenes》 was published in 2019. The authors were van Vliet, Kaj M.;Polak, Lara H.;Siegler, Maxime A.;van der Vlugt, Jarl Ivar;Guerra, Celia Fonseca;de Bruin, Bas, and the article was included in《Journal of the American Chemical Society》. The author mentioned the following in the article:

Direct synthetic routes to amidines are desired, as they are widely present in many biol. active compounds and organometallic complexes. N-Acyl amidines in particular can be used as a starting material for the synthesis of heterocycles and have several other applications. Here, we describe a fast and practical copper-catalyzed three-component reaction of aryl acetylenes, amines, and easily accessible 1,4,2-dioxazol-5-ones to N-acyl amidines, generating CO₂ as the only byproduct. Transformation of the dioxazolones on the Cu catalyst generates acyl nitrenes that rapidly insert into the copper acetylide Cu-C bond rather than undergoing an undesired Curtius rearrangement. For nonaromatic dioxazolones, [Cu(OAc)(Xantphos)] is a superior catalyst for this transformation, leading to full substrate conversion within 10 min. For the direct synthesis of N-benzoyl amidine derivatives from aromatic dioxazolones, [Cu(OAc)(Xantphos)] proved to be inactive, but moderate to good yields were obtained when using simple copper(I) iodide (CuI) as the catalyst. Mechanistic studies revealed the aerobic instability of one of the intermediates at low catalyst loadings, but the reaction could still be performed in air for most substrates when using catalyst loadings of 5 mol %. The herein reported procedure not only provides a new, practical, and direct route to N-acyl amidines but also represents a new type of C-N bond formation. And Methyl 3-methylbenzoate (cas: 99-36-5) was used in the research process.

Methyl 3-methylbenzoate (cas: 99-36-5) is a common ester.Esters are widespread in nature and are widely used in industry. In nature, fats are in general triesters derived from glycerol and fatty acids.Quality Control of Methyl 3-methylbenzoate Esters are responsible for the aroma of many fruits, including apples, durians, pears, bananas, pineapples, and strawberries.

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

Application of 124-06-1《Flavor compounds with high odor activity values (OAV > 1) dominate the aroma of aged Chinese rice wine (Huangjiu) by molecular association》 was published in 2022. The authors were Yang, Yijin;Ai, Lianzhong;Mu, Zhiyong;Liu, Haodong;Yan, Xin;Ni, Li;Zhang, Hui;Xia, Yongjun, and the article was included in《Food Chemistry》. The author mentioned the following in the article:

Aging is an essential operation to perfect the flavor quality of Hungjiu. In this study, formation mechanism of flavor compounds responsible for the characteristic flavor of aged Huangjiu was investigated. The contents of umami and bitter free amino acids (FAA) increased with the storage period prolonged, while that of sweet FAA showed downward trend. Gas chromatograph-mass spectrometry and principal component anal. indicated that the volatile flavor compounds with OAV exceed 1, especially middle-chain fatty-acid-ethyl-esters and aromatic compounds, dominated the characteristic flavor of aged Huangjiu. Low field-NMR was firstly applied to characterize the mol. association between water and dissolved flavor compounds in aged Huangjiu. The results showed that basic amino acids contributed greatly to the flavor formation of aged Huangjiu via mol. association In addition, the mol. association significantly promoted the accumulation of flavor compounds with OAV > 1, especially Et esters.Ethyl tetradecanoate (cas: 124-06-1) were involved in the experimental procedure.

Ethyl tetradecanoate(cas: 124-06-1) is a labeled component from essential oil of natural hawthorn perfume. Also frequently used in cosmetics, soaps, and flavorings.Application of 124-06-1Ethyl myristate is a long-chain fatty acid ethyl ester resulting from the formal condensation of the carboxy group of myristic acid with the hydroxy group of ethanol.

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